From 6f319847d01f6fa511397b83e267d6f7a56ff322 Mon Sep 17 00:00:00 2001 From: Tim Blechmann Date: Thu, 8 May 2025 19:05:17 +0200 Subject: [PATCH] Add q23::expected as a private type This patch adds a std::expected-like type in Qt for use in the Qt implementation. It is using Sy Brand's tl::expected which is similar to std::expected, and works with C++17. Although it closely resembles std::expected, it is not identical and is therefor added as a private header. The new type is intended to be accessible to all Qt modules and is therefore made available through Qt Core. It is, however, not intended for use in public APIs. [ChangeLog][Third-Party Code] Added Sy Brand's tl::expected as a third party dependency for use internally in Qt implementation. Change-Id: I09930f31bf97498643d62814c688f288d5c33265 Reviewed-by: Tim Blechmann --- REUSE.toml | 6 + licenseRule.json | 16 +- src/corelib/CMakeLists.txt | 1 + ...xpected-value-to-tl-unexpected-error.patch | 280 ++ ...-disable-exceptions-with-qt-s-macros.patch | 36 + ...ace_t-with-variadic-unexpected-ctors.patch | 311 ++ ...03-Adapt-tl-expected-to-q23-expected.patch | 106 + .../patches/tlexpected/0004-Prefix-SPDX.patch | 11 + src/corelib/global/qexpected_p.h | 2508 +++++++++++++++++ src/corelib/global/qt_attribution.json | 14 + 10 files changed, 3286 insertions(+), 3 deletions(-) create mode 100644 src/corelib/global/patches/tlexpected/0001-Rename-tl-unexpected-value-to-tl-unexpected-error.patch create mode 100644 src/corelib/global/patches/tlexpected/0001-tl-expected-disable-exceptions-with-qt-s-macros.patch create mode 100644 src/corelib/global/patches/tlexpected/0002-Require-in_place_t-with-variadic-unexpected-ctors.patch create mode 100644 src/corelib/global/patches/tlexpected/0003-Adapt-tl-expected-to-q23-expected.patch create mode 100644 src/corelib/global/patches/tlexpected/0004-Prefix-SPDX.patch create mode 100644 src/corelib/global/qexpected_p.h create mode 100644 src/corelib/global/qt_attribution.json diff --git a/REUSE.toml b/REUSE.toml index de5db5e0e85..c8812eacc03 100644 --- a/REUSE.toml +++ b/REUSE.toml @@ -68,6 +68,12 @@ precedence = "closest" SPDX-FileCopyrightText = "Copyright (C) 2024 The Qt Company Ltd." SPDX-License-Identifier = "LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only" +[[annotations]] +path = ["src/corelib/global/patches/tlexpected/**", "src/corelib/global/qexpected_p.h"] +precedence = "closest" +SPDX-FileCopyrightText = "To the extent possible under law, Sy Brand has waived all copyright and related or neighboring rights to the expected library. This work is published from: United Kingdom." +SPDX-License-Identifier = "CC0-1.0" + [[annotations]] path = ["src/gui/doc/snippets/textdocument-images/images.qrc"] precedence = "closest" diff --git a/licenseRule.json b/licenseRule.json index 1a9c7d2afa5..e35e8ba7fd1 100644 --- a/licenseRule.json +++ b/licenseRule.json @@ -556,10 +556,20 @@ "file type": "build system", "spdx": ["BSD-3-Clause"] }, - "src/corelib/Qt6CoreConfigureFileTemplate.in": { + "src/corelib/global/qexpected_p.h": { "comment": "See REUSE.toml file", - "file type": "build system", - "spdx": ["BSD-3-Clause"] + "file type": "3rd party", + "spdx": ["CC0-1.0"] + }, + "src/corelib/global/patches/tlexpected/": { + "comment": "See REUSE.toml file", + "file type": "3rd party", + "spdx": ["CC0-1.0"] + }, + "src/corelib/Qt6CoreConfigureFileTemplate.in" : { + "comment" : "See REUSE.toml file", + "file type" : "build system", + "spdx" : ["BSD-3-Clause"] } } } diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt index 698f354acff..94667bc3b94 100644 --- a/src/corelib/CMakeLists.txt +++ b/src/corelib/CMakeLists.txt @@ -52,6 +52,7 @@ qt_internal_add_module(Core global/qdarwinhelpers.h global/qendian.cpp global/qendian.h global/qendian_p.h global/qexceptionhandling.h + global/qexpected_p.h global/qflags.h global/qfloat16.cpp global/qfloat16.h global/qforeach.h diff --git a/src/corelib/global/patches/tlexpected/0001-Rename-tl-unexpected-value-to-tl-unexpected-error.patch b/src/corelib/global/patches/tlexpected/0001-Rename-tl-unexpected-value-to-tl-unexpected-error.patch new file mode 100644 index 00000000000..42f5ac1c0cc --- /dev/null +++ b/src/corelib/global/patches/tlexpected/0001-Rename-tl-unexpected-value-to-tl-unexpected-error.patch @@ -0,0 +1,280 @@ +From 14c70a678a76457562a1be33d1809463dd3bf6e8 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?J=C3=B8ger=20Hanseg=C3=A5rd?= +Date: Wed, 19 Feb 2025 12:12:29 +0100 +Subject: [PATCH 1/3] Rename tl::unexpected::value() to tl::unexpected::error() + +Fixes #149 +--- + include/tl/expected.hpp | 52 ++++++++++++++++++++--------------------- + tests/constructors.cpp | 20 ++++++++++++++++ + tests/issues.cpp | 2 +- + tests/observers.cpp | 12 ++++++++++ + tests/relops.cpp | 25 ++++++++++++++++++++ + 5 files changed, 84 insertions(+), 27 deletions(-) + +diff --git a/include/tl/expected.hpp b/include/tl/expected.hpp +index 3c22c5c..9d3a5e1 100644 +--- a/include/tl/expected.hpp ++++ b/include/tl/expected.hpp +@@ -165,10 +165,10 @@ public: + constexpr explicit unexpected(std::initializer_list l, Args &&...args) + : m_val(l, std::forward(args)...) {} + +- constexpr const E &value() const & { return m_val; } +- TL_EXPECTED_11_CONSTEXPR E &value() & { return m_val; } +- TL_EXPECTED_11_CONSTEXPR E &&value() && { return std::move(m_val); } +- constexpr const E &&value() const && { return std::move(m_val); } ++ constexpr const E &error() const & { return m_val; } ++ TL_EXPECTED_11_CONSTEXPR E &error() & { return m_val; } ++ TL_EXPECTED_11_CONSTEXPR E &&error() && { return std::move(m_val); } ++ constexpr const E &&error() const && { return std::move(m_val); } + + private: + E m_val; +@@ -180,27 +180,27 @@ template unexpected(E) -> unexpected; + + template + constexpr bool operator==(const unexpected &lhs, const unexpected &rhs) { +- return lhs.value() == rhs.value(); ++ return lhs.error() == rhs.error(); + } + template + constexpr bool operator!=(const unexpected &lhs, const unexpected &rhs) { +- return lhs.value() != rhs.value(); ++ return lhs.error() != rhs.error(); + } + template + constexpr bool operator<(const unexpected &lhs, const unexpected &rhs) { +- return lhs.value() < rhs.value(); ++ return lhs.error() < rhs.error(); + } + template + constexpr bool operator<=(const unexpected &lhs, const unexpected &rhs) { +- return lhs.value() <= rhs.value(); ++ return lhs.error() <= rhs.error(); + } + template + constexpr bool operator>(const unexpected &lhs, const unexpected &rhs) { +- return lhs.value() > rhs.value(); ++ return lhs.error() > rhs.error(); + } + template + constexpr bool operator>=(const unexpected &lhs, const unexpected &rhs) { +- return lhs.value() >= rhs.value(); ++ return lhs.error() >= rhs.error(); + } + + template +@@ -1582,7 +1582,7 @@ public: + detail::enable_if_t::value> * = + nullptr> + explicit constexpr expected(const unexpected &e) +- : impl_base(unexpect, e.value()), ++ : impl_base(unexpect, e.error()), + ctor_base(detail::default_constructor_tag{}) {} + + template < +@@ -1591,7 +1591,7 @@ public: + nullptr, + detail::enable_if_t::value> * = nullptr> + constexpr expected(unexpected const &e) +- : impl_base(unexpect, e.value()), ++ : impl_base(unexpect, e.error()), + ctor_base(detail::default_constructor_tag{}) {} + + template < +@@ -1600,7 +1600,7 @@ public: + detail::enable_if_t::value> * = nullptr> + explicit constexpr expected(unexpected &&e) noexcept( + std::is_nothrow_constructible::value) +- : impl_base(unexpect, std::move(e.value())), ++ : impl_base(unexpect, std::move(e.error())), + ctor_base(detail::default_constructor_tag{}) {} + + template < +@@ -1609,7 +1609,7 @@ public: + detail::enable_if_t::value> * = nullptr> + constexpr expected(unexpected &&e) noexcept( + std::is_nothrow_constructible::value) +- : impl_base(unexpect, std::move(e.value())), ++ : impl_base(unexpect, std::move(e.error())), + ctor_base(detail::default_constructor_tag{}) {} + + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR const U &value() const & { + if (!has_value()) +- detail::throw_exception(bad_expected_access(err().value())); ++ detail::throw_exception(bad_expected_access(err().error())); + return val(); + } + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR U &value() & { + if (!has_value()) +- detail::throw_exception(bad_expected_access(err().value())); ++ detail::throw_exception(bad_expected_access(err().error())); + return val(); + } + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR const U &&value() const && { + if (!has_value()) +- detail::throw_exception(bad_expected_access(std::move(err()).value())); ++ detail::throw_exception(bad_expected_access(std::move(err()).error())); + return std::move(val()); + } + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR U &&value() && { + if (!has_value()) +- detail::throw_exception(bad_expected_access(std::move(err()).value())); ++ detail::throw_exception(bad_expected_access(std::move(err()).error())); + return std::move(val()); + } + + constexpr const E &error() const & { + TL_ASSERT(!has_value()); +- return err().value(); ++ return err().error(); + } + TL_EXPECTED_11_CONSTEXPR E &error() & { + TL_ASSERT(!has_value()); +- return err().value(); ++ return err().error(); + } + constexpr const E &&error() const && { + TL_ASSERT(!has_value()); +- return std::move(err().value()); ++ return std::move(err().error()); + } + TL_EXPECTED_11_CONSTEXPR E &&error() && { + TL_ASSERT(!has_value()); +- return std::move(err().value()); ++ return std::move(err().error()); + } + + template constexpr T value_or(U &&v) const & { +@@ -2446,19 +2446,19 @@ constexpr bool operator!=(const U &v, const expected &x) { + + template + constexpr bool operator==(const expected &x, const unexpected &e) { +- return x.has_value() ? false : x.error() == e.value(); ++ return x.has_value() ? false : x.error() == e.error(); + } + template + constexpr bool operator==(const unexpected &e, const expected &x) { +- return x.has_value() ? false : x.error() == e.value(); ++ return x.has_value() ? false : x.error() == e.error(); + } + template + constexpr bool operator!=(const expected &x, const unexpected &e) { +- return x.has_value() ? true : x.error() != e.value(); ++ return x.has_value() ? true : x.error() != e.error(); + } + template + constexpr bool operator!=(const unexpected &e, const expected &x) { +- return x.has_value() ? true : x.error() != e.value(); ++ return x.has_value() ? true : x.error() != e.error(); + } + + template u('s'); ++ tl::expected e(u); ++ REQUIRE(e.error() == 's'); ++ } ++ ++ { ++ struct value { ++ constexpr explicit value(char v) : val(v) {} ++ char val; ++ }; ++ ++ constexpr tl::unexpected u('s'); ++ tl::expected e1(u); ++ REQUIRE(e1.error().val == 's'); ++ ++ tl::expected e2(tl::unexpected('s')); ++ REQUIRE(e2.error().val == 's'); ++ } + } +diff --git a/tests/issues.cpp b/tests/issues.cpp +index f929099..9efe14b 100644 +--- a/tests/issues.cpp ++++ b/tests/issues.cpp +@@ -166,7 +166,7 @@ TEST_CASE("Issue 122", "[issues.122]") { + #ifdef __cpp_deduction_guides + TEST_CASE("Issue 89", "[issues.89]") { + auto s = tl::unexpected("Some string"); +- REQUIRE(s.value() == std::string("Some string")); ++ REQUIRE(s.error() == std::string("Some string")); + } + #endif + +diff --git a/tests/observers.cpp b/tests/observers.cpp +index 5d8473c..cff3e9f 100644 +--- a/tests/observers.cpp ++++ b/tests/observers.cpp +@@ -34,3 +34,15 @@ TEST_CASE("Observers", "[observers]") { + REQUIRE(o4->been_moved); + REQUIRE(!o5.been_moved); + } ++ ++#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED ++TEST_CASE("Observers invalid access", "[observers]") { ++ tl::expected err(tl::make_unexpected('!')); ++ ++ REQUIRE_THROWS_AS(err.value(), tl::bad_expected_access); ++ REQUIRE_THROWS_AS(std::as_const(err).value(), tl::bad_expected_access); ++ REQUIRE_THROWS_AS(std::move(std::as_const(err)).value(), ++ tl::bad_expected_access); ++ REQUIRE_THROWS_AS(std::move(err).value(), tl::bad_expected_access); ++} ++#endif +diff --git a/tests/relops.cpp b/tests/relops.cpp +index 99dee5f..b873b6a 100644 +--- a/tests/relops.cpp ++++ b/tests/relops.cpp +@@ -15,3 +15,28 @@ TEST_CASE("Relational operators", "[relops]") { + + REQUIRE(o6 == o6); + } ++ ++TEST_CASE("Relational operators unexpected", "[relops]") { ++ tl::unexpected zero(0); ++ tl::unexpected one(1); ++ ++ REQUIRE(one == one); ++ REQUIRE(one != zero); ++ REQUIRE(zero < one); ++ REQUIRE(zero <= one); ++ REQUIRE(one <= one); ++ REQUIRE(one > zero); ++ REQUIRE(one >= zero); ++ REQUIRE(one >= one); ++} ++ ++TEST_CASE("Relational operators expected vs unexpected", "[relops]") { ++ tl::expected ezero(tl::unexpect, 0); ++ tl::unexpected uzero(0); ++ tl::unexpected uone(1); ++ ++ REQUIRE(ezero == uzero); ++ REQUIRE(ezero != uone); ++ REQUIRE(uzero == ezero); ++ REQUIRE(uone != ezero); ++} +-- +2.44.0.windows.1 + diff --git a/src/corelib/global/patches/tlexpected/0001-tl-expected-disable-exceptions-with-qt-s-macros.patch b/src/corelib/global/patches/tlexpected/0001-tl-expected-disable-exceptions-with-qt-s-macros.patch new file mode 100644 index 00000000000..19e889d5d5c --- /dev/null +++ b/src/corelib/global/patches/tlexpected/0001-tl-expected-disable-exceptions-with-qt-s-macros.patch @@ -0,0 +1,36 @@ +From 6aefb01b0f1547d05dd7eaa549c6f2f435a3b468 Mon Sep 17 00:00:00 2001 +From: Tim Blechmann +Date: Sun, 11 May 2025 10:26:58 +0200 +Subject: [PATCH] tl::expected: disable exceptions with qt's macros + +Change-Id: Ifee3f2800e03f7ecd5c9c218acfd3d7359cd6919 +--- + src/corelib/global/qexpected_p.h | 5 +++++ + 1 file changed, 5 insertions(+) + +diff --git a/src/corelib/global/qexpected_p.h b/src/corelib/global/qexpected_p.h +index a54aea1f7d7..45c6196c947 100644 +--- a/src/corelib/global/qexpected_p.h ++++ b/src/corelib/global/qexpected_p.h +@@ -34,6 +34,7 @@ + #include + #include + #include ++#include + + #include + #include +@@ -46,6 +47,10 @@ + #define TL_EXPECTED_EXCEPTIONS_ENABLED + #endif + ++#if defined(TL_EXPECTED_EXCEPTIONS_ENABLED) && defined(QT_NO_EXCEPTIONS) ++# undef TL_EXPECTED_EXCEPTIONS_ENABLED ++#endif ++ + #if (defined(_MSC_VER) && _MSC_VER == 1900) + #define TL_EXPECTED_MSVC2015 + #define TL_EXPECTED_MSVC2015_CONSTEXPR +-- +2.49.0 + diff --git a/src/corelib/global/patches/tlexpected/0002-Require-in_place_t-with-variadic-unexpected-ctors.patch b/src/corelib/global/patches/tlexpected/0002-Require-in_place_t-with-variadic-unexpected-ctors.patch new file mode 100644 index 00000000000..88a66f81f84 --- /dev/null +++ b/src/corelib/global/patches/tlexpected/0002-Require-in_place_t-with-variadic-unexpected-ctors.patch @@ -0,0 +1,311 @@ +From c6064c91aa84412d07a4f3948d19496e0f294cef Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?J=C3=B8ger=20Hanseg=C3=A5rd?= +Date: Wed, 19 Feb 2025 14:05:45 +0100 +Subject: [PATCH 2/3] Require in_place_t with variadic unexpected ctors + +This makes unexpected ctors more consistent with the C++ standard +--- + include/tl/expected.hpp | 31 +++++----- + tests/constructors.cpp | 123 ++++++++++++++++++++++++++++++++++++++++ + 2 files changed, 140 insertions(+), 14 deletions(-) + +diff --git a/include/tl/expected.hpp b/include/tl/expected.hpp +index 9d3a5e1..83920bd 100644 +--- a/include/tl/expected.hpp ++++ b/include/tl/expected.hpp +@@ -156,13 +156,15 @@ public: + + template ::value>::type * = nullptr> +- constexpr explicit unexpected(Args &&...args) ++ constexpr explicit unexpected(in_place_t, Args &&...args) + : m_val(std::forward(args)...) {} ++ + template < + class U, class... Args, + typename std::enable_if &, Args &&...>::value>::type * = nullptr> +- constexpr explicit unexpected(std::initializer_list l, Args &&...args) ++ constexpr explicit unexpected(in_place_t, std::initializer_list l, ++ Args &&...args) + : m_val(l, std::forward(args)...) {} + + constexpr const E &error() const & { return m_val; } +@@ -471,7 +473,7 @@ struct expected_storage_base { + detail::enable_if_t::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) +- : m_unexpect(std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template il, + Args &&...args) +- : m_unexpect(il, std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + ~expected_storage_base() { + if (m_has_val) { +@@ -518,7 +520,7 @@ template struct expected_storage_base { + detail::enable_if_t::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) +- : m_unexpect(std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template struct expected_storage_base { + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) +- : m_unexpect(il, std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; +@@ -563,7 +565,7 @@ template struct expected_storage_base { + detail::enable_if_t::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) +- : m_unexpect(std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template struct expected_storage_base { + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) +- : m_unexpect(il, std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; +@@ -612,7 +614,7 @@ template struct expected_storage_base { + detail::enable_if_t::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) +- : m_unexpect(std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template struct expected_storage_base { + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) +- : m_unexpect(il, std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, il, std::forward(args)...), ++ m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; +@@ -656,7 +659,7 @@ template struct expected_storage_base { + detail::enable_if_t::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) +- : m_unexpect(std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template struct expected_storage_base { + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) +- : m_unexpect(il, std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; +@@ -690,7 +693,7 @@ template struct expected_storage_base { + detail::enable_if_t::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) +- : m_unexpect(std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template struct expected_storage_base { + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) +- : m_unexpect(il, std::forward(args)...), m_has_val(false) {} ++ : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; +diff --git a/tests/constructors.cpp b/tests/constructors.cpp +index 10b96de..f24a46a 100644 +--- a/tests/constructors.cpp ++++ b/tests/constructors.cpp +@@ -3,6 +3,7 @@ + + #include + #include ++#include + #include + + struct takes_init_and_variadic { +@@ -13,6 +14,27 @@ struct takes_init_and_variadic { + : v(l), t(std::forward(args)...) {} + }; + ++struct trivial_type { ++ int x; ++ int y; ++ trivial_type(int _x, int _y) : x{_x}, y{_y} {} ++ trivial_type(std::initializer_list list) { ++ auto it = list.begin(); ++ x = *it; ++ ++it; ++ y = *it; ++ } ++}; ++ ++struct takes_init_and_variadic_trivial { ++ trivial_type p; ++ std::tuple t; ++ template ++ takes_init_and_variadic_trivial(std::initializer_list l, ++ Args &&...args) ++ : p(l), t(std::forward(args)...) {} ++}; ++ + TEST_CASE("Constructors", "[constructors]") { + { + tl::expected e; +@@ -38,6 +60,12 @@ TEST_CASE("Constructors", "[constructors]") { + REQUIRE(e == 42); + } + ++ { ++ tl::expected e(tl::in_place); ++ REQUIRE(e); ++ REQUIRE(e == 0); ++ } ++ + { + tl::expected,int> e (tl::in_place, {0,1}); + REQUIRE(e); +@@ -52,6 +80,40 @@ TEST_CASE("Constructors", "[constructors]") { + REQUIRE(std::get<1>(*e) == 1); + } + ++ { ++ tl::expected> e(tl::unexpect, 0, 1); ++ REQUIRE(!e); ++ REQUIRE(std::get<0>(e.error()) == 0); ++ REQUIRE(std::get<1>(e.error()) == 1); ++ } ++ ++ { ++ tl::expected> e(tl::unexpect, 0, 1); ++ REQUIRE(!e); ++ REQUIRE(std::get<0>(e.error()) == 0); ++ REQUIRE(std::get<1>(e.error()) == 1); ++ } ++ { ++ tl::expected> e(tl::unexpect, 2, 1); ++ REQUIRE(!e); ++ REQUIRE(e.error()[0] == 1); ++ REQUIRE(e.error()[1] == 1); ++ } ++ { ++ tl::expected, std::vector> e(tl::unexpect, 2, 1); ++ REQUIRE(!e); ++ REQUIRE(e.error()[0] == 1); ++ REQUIRE(e.error()[1] == 1); ++ } ++ { ++ tl::expected, takes_init_and_variadic> e(tl::unexpect, ++ {0, 1}, 2, 3); ++ REQUIRE(!e); ++ REQUIRE(e.error().v[0] == 0); ++ REQUIRE(e.error().v[1] == 1); ++ REQUIRE(std::get<0>(e.error().t) == 2); ++ REQUIRE(std::get<1>(e.error().t) == 3); ++ } + { + tl::expected e (tl::in_place, {0,1}, 2, 3); + REQUIRE(e); +@@ -60,6 +122,59 @@ TEST_CASE("Constructors", "[constructors]") { + REQUIRE(std::get<0>(e->t) == 2); + REQUIRE(std::get<1>(e->t) == 3); + } ++ { ++ tl::expected e(tl::unexpect, {0, 1}, 2, 3); ++ REQUIRE(!e); ++ REQUIRE(e.error().v[0] == 0); ++ REQUIRE(e.error().v[1] == 1); ++ REQUIRE(std::get<0>(e.error().t) == 2); ++ REQUIRE(std::get<1>(e.error().t) == 3); ++ } ++ { ++ tl::expected e(tl::unexpect, {0, 1}, 2, 3); ++ REQUIRE(!e); ++ REQUIRE(e.error().p.x == 0); ++ REQUIRE(e.error().p.y == 1); ++ REQUIRE(std::get<0>(e.error().t) == 2); ++ REQUIRE(std::get<1>(e.error().t) == 3); ++ } ++ { ++ tl::expected e(tl::unexpect, ++ {0, 1}, 2, 3); ++ REQUIRE(!e); ++ REQUIRE(e.error().p.x == 0); ++ REQUIRE(e.error().p.y == 1); ++ REQUIRE(std::get<0>(e.error().t) == 2); ++ REQUIRE(std::get<1>(e.error().t) == 3); ++ } ++ { ++ tl::expected> e(tl::unexpect, 2, 1); ++ REQUIRE(!e); ++ REQUIRE(e.error()[0] == 1); ++ REQUIRE(e.error()[1] == 1); ++ } ++ { ++ tl::expected, trivial_type> e(tl::unexpect, 1, 2); ++ REQUIRE(!e); ++ REQUIRE(e.error().x == 1); ++ REQUIRE(e.error().y == 2); ++ } ++ { ++ tl::expected, takes_init_and_variadic_trivial> e(tl::unexpect, {1, 2}, 3, 4); ++ REQUIRE(!e); ++ REQUIRE(e.error().p.x == 1); ++ REQUIRE(e.error().p.y == 2); ++ REQUIRE(std::get<0>(e.error().t) == 3); ++ REQUIRE(std::get<1>(e.error().t) == 4); ++ } ++ { ++ tl::expected e(tl::unexpect, {0, 1}, 2, 3); ++ REQUIRE(!e); ++ REQUIRE(e.error().v[0] == 0); ++ REQUIRE(e.error().v[1] == 1); ++ REQUIRE(std::get<0>(e.error().t) == 2); ++ REQUIRE(std::get<1>(e.error().t) == 3); ++ } + + { + tl::expected e; +@@ -152,3 +267,11 @@ TEST_CASE("Constructors", "[constructors]") { + REQUIRE(e2.error().val == 's'); + } + } ++ ++TEST_CASE("Unexpected constructors", "[constructors]") { ++ REQUIRE(tl::unexpected(1).error() == 1); ++ REQUIRE(tl::unexpected(tl::in_place).error() == 0); ++ REQUIRE(tl::unexpected(tl::in_place, 1).error() == 1); ++ REQUIRE(tl::unexpected>(tl::in_place, {1, 2, 3}).error() == ++ std::vector{1, 2, 3}); ++} +-- +2.44.0.windows.1 + diff --git a/src/corelib/global/patches/tlexpected/0003-Adapt-tl-expected-to-q23-expected.patch b/src/corelib/global/patches/tlexpected/0003-Adapt-tl-expected-to-q23-expected.patch new file mode 100644 index 00000000000..32c4e6c77c4 --- /dev/null +++ b/src/corelib/global/patches/tlexpected/0003-Adapt-tl-expected-to-q23-expected.patch @@ -0,0 +1,106 @@ +From d99fc8961341d494597a62f5513573660a7f076f Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?J=C3=B8ger=20Hanseg=C3=A5rd?= +Date: Tue, 18 Feb 2025 16:07:45 +0100 +Subject: [PATCH 3/3] Adapt tl::expected to q23::expected + +--- + include/tl/{expected.hpp => qexpected_p.h} | 33 ++++++++++++++++++---- + 1 file changed, 27 insertions(+), 6 deletions(-) + rename include/tl/{expected.hpp => qexpected_p.h} (99%) + +diff --git a/include/tl/expected.hpp b/include/tl/qexpected_p.h +similarity index 99% +rename from include/tl/expected.hpp +rename to include/tl/qexpected_p.h +index 83920bd..a54aea1 100644 +--- a/include/tl/expected.hpp ++++ b/include/tl/qexpected_p.h +@@ -16,15 +16,32 @@ + #ifndef TL_EXPECTED_HPP + #define TL_EXPECTED_HPP + ++// ++// W A R N I N G ++// ------------- ++// ++// This file is not part of the Qt API. It exists purely as an ++// implementation detail. This header file may change from version to ++// version without notice, or even be removed. ++// ++// We mean it. ++// ++ + #define TL_EXPECTED_VERSION_MAJOR 1 + #define TL_EXPECTED_VERSION_MINOR 1 + #define TL_EXPECTED_VERSION_PATCH 0 + ++#include ++#include ++#include ++ + #include + #include + #include + #include + ++#define TL_ASSERT Q_ASSERT ++ + #if defined(__EXCEPTIONS) || defined(_CPPUNWIND) + #define TL_EXPECTED_EXCEPTIONS_ENABLED + #endif +@@ -81,7 +98,8 @@ + #elif (defined(__GNUC__) && __GNUC__ < 8 && !defined(__clang__)) + #ifndef TL_GCC_LESS_8_TRIVIALLY_COPY_CONSTRUCTIBLE_MUTEX + #define TL_GCC_LESS_8_TRIVIALLY_COPY_CONSTRUCTIBLE_MUTEX +-namespace tl { ++QT_BEGIN_NAMESPACE ++namespace q23 { + namespace detail { + template + struct is_trivially_copy_constructible +@@ -91,11 +109,12 @@ template + struct is_trivially_copy_constructible> : std::false_type {}; + #endif + } // namespace detail +-} // namespace tl ++} // namespace q23 ++QT_END_NAMESPACE + #endif + + #define TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) \ +- tl::detail::is_trivially_copy_constructible ++ q23::detail::is_trivially_copy_constructible + #define TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(T) \ + std::is_trivially_copy_assignable + #define TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(T) \ +@@ -132,7 +151,8 @@ struct is_trivially_copy_constructible> : std::false_type {}; + #define TL_EXPECTED_11_CONSTEXPR constexpr + #endif + +-namespace tl { ++QT_BEGIN_NAMESPACE ++namespace q23 { + template class expected; + + #ifndef TL_MONOSTATE_INPLACE_MUTEX +@@ -396,7 +416,7 @@ struct is_nothrow_swappable + #endif + #endif + +-// Trait for checking if a type is a tl::expected ++// Trait for checking if a type is a q23::expected + template struct is_expected_impl : std::false_type {}; + template + struct is_expected_impl> : std::true_type {}; +@@ -2474,6 +2494,7 @@ void swap(expected &lhs, + expected &rhs) noexcept(noexcept(lhs.swap(rhs))) { + lhs.swap(rhs); + } +-} // namespace tl ++} // namespace q23 ++QT_END_NAMESPACE + + #endif +-- +2.44.0.windows.1 + diff --git a/src/corelib/global/patches/tlexpected/0004-Prefix-SPDX.patch b/src/corelib/global/patches/tlexpected/0004-Prefix-SPDX.patch new file mode 100644 index 00000000000..882bdb1acd0 --- /dev/null +++ b/src/corelib/global/patches/tlexpected/0004-Prefix-SPDX.patch @@ -0,0 +1,11 @@ +diff --git a/src/corelib/global/qexpected_p.h b/src/corelib/global/qexpected_p.h +index 45c6196c947..1c9b37ae82f 100644 +--- a/src/corelib/global/qexpected_p.h ++++ b/src/corelib/global/qexpected_p.h +@@ -1,3 +1,6 @@ ++// Copyright (C) 2017 Sy Brand (tartanllama@gmail.com, @TartanLlama) ++// SPDX-License-Identifier: CC0-1.0 ++ + /// + // expected - An implementation of std::expected with extensions + // Written in 2017 by Sy Brand (tartanllama@gmail.com, @TartanLlama) diff --git a/src/corelib/global/qexpected_p.h b/src/corelib/global/qexpected_p.h new file mode 100644 index 00000000000..1c9b37ae82f --- /dev/null +++ b/src/corelib/global/qexpected_p.h @@ -0,0 +1,2508 @@ +// Copyright (C) 2017 Sy Brand (tartanllama@gmail.com, @TartanLlama) +// SPDX-License-Identifier: CC0-1.0 + +/// +// expected - An implementation of std::expected with extensions +// Written in 2017 by Sy Brand (tartanllama@gmail.com, @TartanLlama) +// +// Documentation available at http://tl.tartanllama.xyz/ +// +// To the extent possible under law, the author(s) have dedicated all +// copyright and related and neighboring rights to this software to the +// public domain worldwide. This software is distributed without any warranty. +// +// You should have received a copy of the CC0 Public Domain Dedication +// along with this software. If not, see +// . +/// + +#ifndef TL_EXPECTED_HPP +#define TL_EXPECTED_HPP + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#define TL_EXPECTED_VERSION_MAJOR 1 +#define TL_EXPECTED_VERSION_MINOR 1 +#define TL_EXPECTED_VERSION_PATCH 0 + +#include +#include +#include +#include + +#include +#include +#include +#include + +#define TL_ASSERT Q_ASSERT + +#if defined(__EXCEPTIONS) || defined(_CPPUNWIND) +#define TL_EXPECTED_EXCEPTIONS_ENABLED +#endif + +#if defined(TL_EXPECTED_EXCEPTIONS_ENABLED) && defined(QT_NO_EXCEPTIONS) +# undef TL_EXPECTED_EXCEPTIONS_ENABLED +#endif + +#if (defined(_MSC_VER) && _MSC_VER == 1900) +#define TL_EXPECTED_MSVC2015 +#define TL_EXPECTED_MSVC2015_CONSTEXPR +#else +#define TL_EXPECTED_MSVC2015_CONSTEXPR constexpr +#endif + +#if (defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ <= 9 && \ + !defined(__clang__)) +#define TL_EXPECTED_GCC49 +#endif + +#if (defined(__GNUC__) && __GNUC__ == 5 && __GNUC_MINOR__ <= 4 && \ + !defined(__clang__)) +#define TL_EXPECTED_GCC54 +#endif + +#if (defined(__GNUC__) && __GNUC__ == 5 && __GNUC_MINOR__ <= 5 && \ + !defined(__clang__)) +#define TL_EXPECTED_GCC55 +#endif + +#if !defined(TL_ASSERT) +//can't have assert in constexpr in C++11 and GCC 4.9 has a compiler bug +#if (TL_CPLUSPLUS > 201103L) && !defined(TL_EXPECTED_GCC49) +#include +#define TL_ASSERT(x) assert(x) +#else +#define TL_ASSERT(x) +#endif +#endif + +#if (defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ <= 9 && \ + !defined(__clang__)) +// GCC < 5 doesn't support overloading on const&& for member functions + +#define TL_EXPECTED_NO_CONSTRR +// GCC < 5 doesn't support some standard C++11 type traits +#define TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) \ + std::has_trivial_copy_constructor +#define TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(T) \ + std::has_trivial_copy_assign + +// This one will be different for GCC 5.7 if it's ever supported +#define TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(T) \ + std::is_trivially_destructible + +// GCC 5 < v < 8 has a bug in is_trivially_copy_constructible which breaks +// std::vector for non-copyable types +#elif (defined(__GNUC__) && __GNUC__ < 8 && !defined(__clang__)) +#ifndef TL_GCC_LESS_8_TRIVIALLY_COPY_CONSTRUCTIBLE_MUTEX +#define TL_GCC_LESS_8_TRIVIALLY_COPY_CONSTRUCTIBLE_MUTEX +QT_BEGIN_NAMESPACE +namespace q23 { +namespace detail { +template +struct is_trivially_copy_constructible + : std::is_trivially_copy_constructible {}; +#ifdef _GLIBCXX_VECTOR +template +struct is_trivially_copy_constructible> : std::false_type {}; +#endif +} // namespace detail +} // namespace q23 +QT_END_NAMESPACE +#endif + +#define TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) \ + q23::detail::is_trivially_copy_constructible +#define TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(T) \ + std::is_trivially_copy_assignable +#define TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(T) \ + std::is_trivially_destructible +#else +#define TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) \ + std::is_trivially_copy_constructible +#define TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(T) \ + std::is_trivially_copy_assignable +#define TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(T) \ + std::is_trivially_destructible +#endif + +#ifdef _MSVC_LANG +#define TL_CPLUSPLUS _MSVC_LANG +#else +#define TL_CPLUSPLUS __cplusplus +#endif + +#if TL_CPLUSPLUS > 201103L +#define TL_EXPECTED_CXX14 +#endif + +#ifdef TL_EXPECTED_GCC49 +#define TL_EXPECTED_GCC49_CONSTEXPR +#else +#define TL_EXPECTED_GCC49_CONSTEXPR constexpr +#endif + +#if (TL_CPLUSPLUS == 201103L || defined(TL_EXPECTED_MSVC2015) || \ + defined(TL_EXPECTED_GCC49)) +#define TL_EXPECTED_11_CONSTEXPR +#else +#define TL_EXPECTED_11_CONSTEXPR constexpr +#endif + +QT_BEGIN_NAMESPACE +namespace q23 { +template class expected; + +#ifndef TL_MONOSTATE_INPLACE_MUTEX +#define TL_MONOSTATE_INPLACE_MUTEX +class monostate {}; + +struct in_place_t { + explicit in_place_t() = default; +}; +static constexpr in_place_t in_place{}; +#endif + +template class unexpected { +public: + static_assert(!std::is_same::value, "E must not be void"); + + unexpected() = delete; + constexpr explicit unexpected(const E &e) : m_val(e) {} + + constexpr explicit unexpected(E &&e) : m_val(std::move(e)) {} + + template ::value>::type * = nullptr> + constexpr explicit unexpected(in_place_t, Args &&...args) + : m_val(std::forward(args)...) {} + + template < + class U, class... Args, + typename std::enable_if &, Args &&...>::value>::type * = nullptr> + constexpr explicit unexpected(in_place_t, std::initializer_list l, + Args &&...args) + : m_val(l, std::forward(args)...) {} + + constexpr const E &error() const & { return m_val; } + TL_EXPECTED_11_CONSTEXPR E &error() & { return m_val; } + TL_EXPECTED_11_CONSTEXPR E &&error() && { return std::move(m_val); } + constexpr const E &&error() const && { return std::move(m_val); } + +private: + E m_val; +}; + +#ifdef __cpp_deduction_guides +template unexpected(E) -> unexpected; +#endif + +template +constexpr bool operator==(const unexpected &lhs, const unexpected &rhs) { + return lhs.error() == rhs.error(); +} +template +constexpr bool operator!=(const unexpected &lhs, const unexpected &rhs) { + return lhs.error() != rhs.error(); +} +template +constexpr bool operator<(const unexpected &lhs, const unexpected &rhs) { + return lhs.error() < rhs.error(); +} +template +constexpr bool operator<=(const unexpected &lhs, const unexpected &rhs) { + return lhs.error() <= rhs.error(); +} +template +constexpr bool operator>(const unexpected &lhs, const unexpected &rhs) { + return lhs.error() > rhs.error(); +} +template +constexpr bool operator>=(const unexpected &lhs, const unexpected &rhs) { + return lhs.error() >= rhs.error(); +} + +template +unexpected::type> make_unexpected(E &&e) { + return unexpected::type>(std::forward(e)); +} + +struct unexpect_t { + unexpect_t() = default; +}; +static constexpr unexpect_t unexpect{}; + +namespace detail { +template +[[noreturn]] TL_EXPECTED_11_CONSTEXPR void throw_exception(E &&e) { +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + throw std::forward(e); +#else + (void)e; +#ifdef _MSC_VER + __assume(0); +#else + __builtin_unreachable(); +#endif +#endif +} + +#ifndef TL_TRAITS_MUTEX +#define TL_TRAITS_MUTEX +// C++14-style aliases for brevity +template using remove_const_t = typename std::remove_const::type; +template +using remove_reference_t = typename std::remove_reference::type; +template using decay_t = typename std::decay::type; +template +using enable_if_t = typename std::enable_if::type; +template +using conditional_t = typename std::conditional::type; + +// std::conjunction from C++17 +template struct conjunction : std::true_type {}; +template struct conjunction : B {}; +template +struct conjunction + : std::conditional, B>::type {}; + +#if defined(_LIBCPP_VERSION) && __cplusplus == 201103L +#define TL_TRAITS_LIBCXX_MEM_FN_WORKAROUND +#endif + +// In C++11 mode, there's an issue in libc++'s std::mem_fn +// which results in a hard-error when using it in a noexcept expression +// in some cases. This is a check to workaround the common failing case. +#ifdef TL_TRAITS_LIBCXX_MEM_FN_WORKAROUND +template +struct is_pointer_to_non_const_member_func : std::false_type {}; +template +struct is_pointer_to_non_const_member_func + : std::true_type {}; +template +struct is_pointer_to_non_const_member_func + : std::true_type {}; +template +struct is_pointer_to_non_const_member_func + : std::true_type {}; +template +struct is_pointer_to_non_const_member_func + : std::true_type {}; +template +struct is_pointer_to_non_const_member_func + : std::true_type {}; +template +struct is_pointer_to_non_const_member_func + : std::true_type {}; + +template struct is_const_or_const_ref : std::false_type {}; +template struct is_const_or_const_ref : std::true_type {}; +template struct is_const_or_const_ref : std::true_type {}; +#endif + +// std::invoke from C++17 +// https://stackoverflow.com/questions/38288042/c11-14-invoke-workaround +template < + typename Fn, typename... Args, +#ifdef TL_TRAITS_LIBCXX_MEM_FN_WORKAROUND + typename = enable_if_t::value && + is_const_or_const_ref::value)>, +#endif + typename = enable_if_t>::value>, int = 0> +constexpr auto invoke(Fn &&f, Args &&...args) noexcept( + noexcept(std::mem_fn(f)(std::forward(args)...))) + -> decltype(std::mem_fn(f)(std::forward(args)...)) { + return std::mem_fn(f)(std::forward(args)...); +} + +template >::value>> +constexpr auto invoke(Fn &&f, Args &&...args) noexcept( + noexcept(std::forward(f)(std::forward(args)...))) + -> decltype(std::forward(f)(std::forward(args)...)) { + return std::forward(f)(std::forward(args)...); +} + +// std::invoke_result from C++17 +template struct invoke_result_impl; + +template +struct invoke_result_impl< + F, + decltype(detail::invoke(std::declval(), std::declval()...), void()), + Us...> { + using type = + decltype(detail::invoke(std::declval(), std::declval()...)); +}; + +template +using invoke_result = invoke_result_impl; + +template +using invoke_result_t = typename invoke_result::type; + +#if defined(_MSC_VER) && _MSC_VER <= 1900 +// TODO make a version which works with MSVC 2015 +template struct is_swappable : std::true_type {}; + +template struct is_nothrow_swappable : std::true_type {}; +#else +// https://stackoverflow.com/questions/26744589/what-is-a-proper-way-to-implement-is-swappable-to-test-for-the-swappable-concept +namespace swap_adl_tests { +// if swap ADL finds this then it would call std::swap otherwise (same +// signature) +struct tag {}; + +template tag swap(T &, T &); +template tag swap(T (&a)[N], T (&b)[N]); + +// helper functions to test if an unqualified swap is possible, and if it +// becomes std::swap +template std::false_type can_swap(...) noexcept(false); +template (), std::declval()))> +std::true_type can_swap(int) noexcept(noexcept(swap(std::declval(), + std::declval()))); + +template std::false_type uses_std(...); +template +std::is_same(), std::declval())), tag> +uses_std(int); + +template +struct is_std_swap_noexcept + : std::integral_constant::value && + std::is_nothrow_move_assignable::value> {}; + +template +struct is_std_swap_noexcept : is_std_swap_noexcept {}; + +template +struct is_adl_swap_noexcept + : std::integral_constant(0))> {}; +} // namespace swap_adl_tests + +template +struct is_swappable + : std::integral_constant< + bool, + decltype(detail::swap_adl_tests::can_swap(0))::value && + (!decltype(detail::swap_adl_tests::uses_std(0))::value || + (std::is_move_assignable::value && + std::is_move_constructible::value))> {}; + +template +struct is_swappable + : std::integral_constant< + bool, + decltype(detail::swap_adl_tests::can_swap(0))::value && + (!decltype(detail::swap_adl_tests::uses_std( + 0))::value || + is_swappable::value)> {}; + +template +struct is_nothrow_swappable + : std::integral_constant< + bool, + is_swappable::value && + ((decltype(detail::swap_adl_tests::uses_std(0))::value && + detail::swap_adl_tests::is_std_swap_noexcept::value) || + (!decltype(detail::swap_adl_tests::uses_std(0))::value && + detail::swap_adl_tests::is_adl_swap_noexcept::value))> {}; +#endif +#endif + +// Trait for checking if a type is a q23::expected +template struct is_expected_impl : std::false_type {}; +template +struct is_expected_impl> : std::true_type {}; +template using is_expected = is_expected_impl>; + +template +using expected_enable_forward_value = detail::enable_if_t< + std::is_constructible::value && + !std::is_same, in_place_t>::value && + !std::is_same, detail::decay_t>::value && + !std::is_same, detail::decay_t>::value>; + +template +using expected_enable_from_other = detail::enable_if_t< + std::is_constructible::value && + std::is_constructible::value && + !std::is_constructible &>::value && + !std::is_constructible &&>::value && + !std::is_constructible &>::value && + !std::is_constructible &&>::value && + !std::is_convertible &, T>::value && + !std::is_convertible &&, T>::value && + !std::is_convertible &, T>::value && + !std::is_convertible &&, T>::value>; + +template +using is_void_or = conditional_t::value, std::true_type, U>; + +template +using is_copy_constructible_or_void = + is_void_or>; + +template +using is_move_constructible_or_void = + is_void_or>; + +template +using is_copy_assignable_or_void = is_void_or>; + +template +using is_move_assignable_or_void = is_void_or>; + +} // namespace detail + +namespace detail { +struct no_init_t {}; +static constexpr no_init_t no_init{}; + +// Implements the storage of the values, and ensures that the destructor is +// trivial if it can be. +// +// This specialization is for where neither `T` or `E` is trivially +// destructible, so the destructors must be called on destruction of the +// `expected` +template ::value, + bool = std::is_trivially_destructible::value> +struct expected_storage_base { + constexpr expected_storage_base() : m_val(T{}), m_has_val(true) {} + constexpr expected_storage_base(no_init_t) : m_no_init(), m_has_val(false) {} + + template ::value> * = + nullptr> + constexpr expected_storage_base(in_place_t, Args &&...args) + : m_val(std::forward(args)...), m_has_val(true) {} + + template &, Args &&...>::value> * = nullptr> + constexpr expected_storage_base(in_place_t, std::initializer_list il, + Args &&...args) + : m_val(il, std::forward(args)...), m_has_val(true) {} + template ::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) + : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template &, Args &&...>::value> * = nullptr> + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) + : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + ~expected_storage_base() { + if (m_has_val) { + m_val.~T(); + } else { + m_unexpect.~unexpected(); + } + } + union { + T m_val; + unexpected m_unexpect; + char m_no_init; + }; + bool m_has_val; +}; + +// This specialization is for when both `T` and `E` are trivially-destructible, +// so the destructor of the `expected` can be trivial. +template struct expected_storage_base { + constexpr expected_storage_base() : m_val(T{}), m_has_val(true) {} + constexpr expected_storage_base(no_init_t) : m_no_init(), m_has_val(false) {} + + template ::value> * = + nullptr> + constexpr expected_storage_base(in_place_t, Args &&...args) + : m_val(std::forward(args)...), m_has_val(true) {} + + template &, Args &&...>::value> * = nullptr> + constexpr expected_storage_base(in_place_t, std::initializer_list il, + Args &&...args) + : m_val(il, std::forward(args)...), m_has_val(true) {} + template ::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) + : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template &, Args &&...>::value> * = nullptr> + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) + : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; + expected_storage_base &operator=(const expected_storage_base &) = default; + expected_storage_base &operator=(expected_storage_base &&) = default; + ~expected_storage_base() = default; + union { + T m_val; + unexpected m_unexpect; + char m_no_init; + }; + bool m_has_val; +}; + +// T is trivial, E is not. +template struct expected_storage_base { + constexpr expected_storage_base() : m_val(T{}), m_has_val(true) {} + TL_EXPECTED_MSVC2015_CONSTEXPR expected_storage_base(no_init_t) + : m_no_init(), m_has_val(false) {} + + template ::value> * = + nullptr> + constexpr expected_storage_base(in_place_t, Args &&...args) + : m_val(std::forward(args)...), m_has_val(true) {} + + template &, Args &&...>::value> * = nullptr> + constexpr expected_storage_base(in_place_t, std::initializer_list il, + Args &&...args) + : m_val(il, std::forward(args)...), m_has_val(true) {} + template ::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) + : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template &, Args &&...>::value> * = nullptr> + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) + : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; + expected_storage_base &operator=(const expected_storage_base &) = default; + expected_storage_base &operator=(expected_storage_base &&) = default; + ~expected_storage_base() { + if (!m_has_val) { + m_unexpect.~unexpected(); + } + } + + union { + T m_val; + unexpected m_unexpect; + char m_no_init; + }; + bool m_has_val; +}; + +// E is trivial, T is not. +template struct expected_storage_base { + constexpr expected_storage_base() : m_val(T{}), m_has_val(true) {} + constexpr expected_storage_base(no_init_t) : m_no_init(), m_has_val(false) {} + + template ::value> * = + nullptr> + constexpr expected_storage_base(in_place_t, Args &&...args) + : m_val(std::forward(args)...), m_has_val(true) {} + + template &, Args &&...>::value> * = nullptr> + constexpr expected_storage_base(in_place_t, std::initializer_list il, + Args &&...args) + : m_val(il, std::forward(args)...), m_has_val(true) {} + template ::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) + : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template &, Args &&...>::value> * = nullptr> + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) + : m_unexpect(in_place, il, std::forward(args)...), + m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; + expected_storage_base &operator=(const expected_storage_base &) = default; + expected_storage_base &operator=(expected_storage_base &&) = default; + ~expected_storage_base() { + if (m_has_val) { + m_val.~T(); + } + } + union { + T m_val; + unexpected m_unexpect; + char m_no_init; + }; + bool m_has_val; +}; + +// `T` is `void`, `E` is trivially-destructible +template struct expected_storage_base { + #if __GNUC__ <= 5 + //no constexpr for GCC 4/5 bug + #else + TL_EXPECTED_MSVC2015_CONSTEXPR + #endif + expected_storage_base() : m_has_val(true) {} + + constexpr expected_storage_base(no_init_t) : m_val(), m_has_val(false) {} + + constexpr expected_storage_base(in_place_t) : m_has_val(true) {} + + template ::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) + : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template &, Args &&...>::value> * = nullptr> + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) + : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; + expected_storage_base &operator=(const expected_storage_base &) = default; + expected_storage_base &operator=(expected_storage_base &&) = default; + ~expected_storage_base() = default; + struct dummy {}; + union { + unexpected m_unexpect; + dummy m_val; + }; + bool m_has_val; +}; + +// `T` is `void`, `E` is not trivially-destructible +template struct expected_storage_base { + constexpr expected_storage_base() : m_dummy(), m_has_val(true) {} + constexpr expected_storage_base(no_init_t) : m_dummy(), m_has_val(false) {} + + constexpr expected_storage_base(in_place_t) : m_dummy(), m_has_val(true) {} + + template ::value> * = + nullptr> + constexpr explicit expected_storage_base(unexpect_t, Args &&...args) + : m_unexpect(in_place, std::forward(args)...), m_has_val(false) {} + + template &, Args &&...>::value> * = nullptr> + constexpr explicit expected_storage_base(unexpect_t, + std::initializer_list il, + Args &&...args) + : m_unexpect(in_place, il, std::forward(args)...), m_has_val(false) {} + + expected_storage_base(const expected_storage_base &) = default; + expected_storage_base(expected_storage_base &&) = default; + expected_storage_base &operator=(const expected_storage_base &) = default; + expected_storage_base &operator=(expected_storage_base &&) = default; + ~expected_storage_base() { + if (!m_has_val) { + m_unexpect.~unexpected(); + } + } + + union { + unexpected m_unexpect; + char m_dummy; + }; + bool m_has_val; +}; + +// This base class provides some handy member functions which can be used in +// further derived classes +template +struct expected_operations_base : expected_storage_base { + using expected_storage_base::expected_storage_base; + + template void construct(Args &&...args) noexcept { + new (std::addressof(this->m_val)) T(std::forward(args)...); + this->m_has_val = true; + } + + template void construct_with(Rhs &&rhs) noexcept { + new (std::addressof(this->m_val)) T(std::forward(rhs).get()); + this->m_has_val = true; + } + + template void construct_error(Args &&...args) noexcept { + new (std::addressof(this->m_unexpect)) + unexpected(std::forward(args)...); + this->m_has_val = false; + } + +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + + // These assign overloads ensure that the most efficient assignment + // implementation is used while maintaining the strong exception guarantee. + // The problematic case is where rhs has a value, but *this does not. + // + // This overload handles the case where we can just copy-construct `T` + // directly into place without throwing. + template ::value> + * = nullptr> + void assign(const expected_operations_base &rhs) noexcept { + if (!this->m_has_val && rhs.m_has_val) { + geterr().~unexpected(); + construct(rhs.get()); + } else { + assign_common(rhs); + } + } + + // This overload handles the case where we can attempt to create a copy of + // `T`, then no-throw move it into place if the copy was successful. + template ::value && + std::is_nothrow_move_constructible::value> + * = nullptr> + void assign(const expected_operations_base &rhs) noexcept { + if (!this->m_has_val && rhs.m_has_val) { + T tmp = rhs.get(); + geterr().~unexpected(); + construct(std::move(tmp)); + } else { + assign_common(rhs); + } + } + + // This overload is the worst-case, where we have to move-construct the + // unexpected value into temporary storage, then try to copy the T into place. + // If the construction succeeds, then everything is fine, but if it throws, + // then we move the old unexpected value back into place before rethrowing the + // exception. + template ::value && + !std::is_nothrow_move_constructible::value> + * = nullptr> + void assign(const expected_operations_base &rhs) { + if (!this->m_has_val && rhs.m_has_val) { + auto tmp = std::move(geterr()); + geterr().~unexpected(); + +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + try { + construct(rhs.get()); + } catch (...) { + geterr() = std::move(tmp); + throw; + } +#else + construct(rhs.get()); +#endif + } else { + assign_common(rhs); + } + } + + // These overloads do the same as above, but for rvalues + template ::value> + * = nullptr> + void assign(expected_operations_base &&rhs) noexcept { + if (!this->m_has_val && rhs.m_has_val) { + geterr().~unexpected(); + construct(std::move(rhs).get()); + } else { + assign_common(std::move(rhs)); + } + } + + template ::value> + * = nullptr> + void assign(expected_operations_base &&rhs) { + if (!this->m_has_val && rhs.m_has_val) { + auto tmp = std::move(geterr()); + geterr().~unexpected(); +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + try { + construct(std::move(rhs).get()); + } catch (...) { + geterr() = std::move(tmp); + throw; + } +#else + construct(std::move(rhs).get()); +#endif + } else { + assign_common(std::move(rhs)); + } + } + +#else + + // If exceptions are disabled then we can just copy-construct + void assign(const expected_operations_base &rhs) noexcept { + if (!this->m_has_val && rhs.m_has_val) { + geterr().~unexpected(); + construct(rhs.get()); + } else { + assign_common(rhs); + } + } + + void assign(expected_operations_base &&rhs) noexcept { + if (!this->m_has_val && rhs.m_has_val) { + geterr().~unexpected(); + construct(std::move(rhs).get()); + } else { + assign_common(std::move(rhs)); + } + } + +#endif + + // The common part of move/copy assigning + template void assign_common(Rhs &&rhs) { + if (this->m_has_val) { + if (rhs.m_has_val) { + get() = std::forward(rhs).get(); + } else { + destroy_val(); + construct_error(std::forward(rhs).geterr()); + } + } else { + if (!rhs.m_has_val) { + geterr() = std::forward(rhs).geterr(); + } + } + } + + bool has_value() const { return this->m_has_val; } + + TL_EXPECTED_11_CONSTEXPR T &get() & { return this->m_val; } + constexpr const T &get() const & { return this->m_val; } + TL_EXPECTED_11_CONSTEXPR T &&get() && { return std::move(this->m_val); } +#ifndef TL_EXPECTED_NO_CONSTRR + constexpr const T &&get() const && { return std::move(this->m_val); } +#endif + + TL_EXPECTED_11_CONSTEXPR unexpected &geterr() & { + return this->m_unexpect; + } + constexpr const unexpected &geterr() const & { return this->m_unexpect; } + TL_EXPECTED_11_CONSTEXPR unexpected &&geterr() && { + return std::move(this->m_unexpect); + } +#ifndef TL_EXPECTED_NO_CONSTRR + constexpr const unexpected &&geterr() const && { + return std::move(this->m_unexpect); + } +#endif + + TL_EXPECTED_11_CONSTEXPR void destroy_val() { get().~T(); } +}; + +// This base class provides some handy member functions which can be used in +// further derived classes +template +struct expected_operations_base : expected_storage_base { + using expected_storage_base::expected_storage_base; + + template void construct() noexcept { this->m_has_val = true; } + + // This function doesn't use its argument, but needs it so that code in + // levels above this can work independently of whether T is void + template void construct_with(Rhs &&) noexcept { + this->m_has_val = true; + } + + template void construct_error(Args &&...args) noexcept { + new (std::addressof(this->m_unexpect)) + unexpected(std::forward(args)...); + this->m_has_val = false; + } + + template void assign(Rhs &&rhs) noexcept { + if (!this->m_has_val) { + if (rhs.m_has_val) { + geterr().~unexpected(); + construct(); + } else { + geterr() = std::forward(rhs).geterr(); + } + } else { + if (!rhs.m_has_val) { + construct_error(std::forward(rhs).geterr()); + } + } + } + + bool has_value() const { return this->m_has_val; } + + TL_EXPECTED_11_CONSTEXPR unexpected &geterr() & { + return this->m_unexpect; + } + constexpr const unexpected &geterr() const & { return this->m_unexpect; } + TL_EXPECTED_11_CONSTEXPR unexpected &&geterr() && { + return std::move(this->m_unexpect); + } +#ifndef TL_EXPECTED_NO_CONSTRR + constexpr const unexpected &&geterr() const && { + return std::move(this->m_unexpect); + } +#endif + + TL_EXPECTED_11_CONSTEXPR void destroy_val() { + // no-op + } +}; + +// This class manages conditionally having a trivial copy constructor +// This specialization is for when T and E are trivially copy constructible +template :: + value &&TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(E)::value, + bool = (is_copy_constructible_or_void::value && + std::is_copy_constructible::value)> +struct expected_copy_base : expected_operations_base { + using expected_operations_base::expected_operations_base; +}; + +// This specialization is for when T or E are non-trivially copy constructible +template +struct expected_copy_base : expected_operations_base { + using expected_operations_base::expected_operations_base; + + expected_copy_base() = default; + expected_copy_base(const expected_copy_base &rhs) + : expected_operations_base(no_init) { + if (rhs.has_value()) { + this->construct_with(rhs); + } else { + this->construct_error(rhs.geterr()); + } + } + + expected_copy_base(expected_copy_base &&rhs) = default; + expected_copy_base &operator=(const expected_copy_base &rhs) = default; + expected_copy_base &operator=(expected_copy_base &&rhs) = default; +}; + +// This class manages conditionally having a trivial move constructor +// Unfortunately there's no way to achieve this in GCC < 5 AFAIK, since it +// doesn't implement an analogue to std::is_trivially_move_constructible. We +// have to make do with a non-trivial move constructor even if T is trivially +// move constructible +#ifndef TL_EXPECTED_GCC49 +template >::value + &&std::is_trivially_move_constructible::value> +struct expected_move_base : expected_copy_base { + using expected_copy_base::expected_copy_base; +}; +#else +template struct expected_move_base; +#endif +template +struct expected_move_base : expected_copy_base { + using expected_copy_base::expected_copy_base; + + expected_move_base() = default; + expected_move_base(const expected_move_base &rhs) = default; + + expected_move_base(expected_move_base &&rhs) noexcept( + std::is_nothrow_move_constructible::value) + : expected_copy_base(no_init) { + if (rhs.has_value()) { + this->construct_with(std::move(rhs)); + } else { + this->construct_error(std::move(rhs.geterr())); + } + } + expected_move_base &operator=(const expected_move_base &rhs) = default; + expected_move_base &operator=(expected_move_base &&rhs) = default; +}; + +// This class manages conditionally having a trivial copy assignment operator +template >::value + &&TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(E)::value + &&TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(E)::value + &&TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(E)::value, + bool = (is_copy_constructible_or_void::value && + std::is_copy_constructible::value && + is_copy_assignable_or_void::value && + std::is_copy_assignable::value)> +struct expected_copy_assign_base : expected_move_base { + using expected_move_base::expected_move_base; +}; + +template +struct expected_copy_assign_base : expected_move_base { + using expected_move_base::expected_move_base; + + expected_copy_assign_base() = default; + expected_copy_assign_base(const expected_copy_assign_base &rhs) = default; + + expected_copy_assign_base(expected_copy_assign_base &&rhs) = default; + expected_copy_assign_base &operator=(const expected_copy_assign_base &rhs) { + this->assign(rhs); + return *this; + } + expected_copy_assign_base & + operator=(expected_copy_assign_base &&rhs) = default; +}; + +// This class manages conditionally having a trivial move assignment operator +// Unfortunately there's no way to achieve this in GCC < 5 AFAIK, since it +// doesn't implement an analogue to std::is_trivially_move_assignable. We have +// to make do with a non-trivial move assignment operator even if T is trivially +// move assignable +#ifndef TL_EXPECTED_GCC49 +template , + std::is_trivially_move_constructible, + std::is_trivially_move_assignable>>:: + value &&std::is_trivially_destructible::value + &&std::is_trivially_move_constructible::value + &&std::is_trivially_move_assignable::value> +struct expected_move_assign_base : expected_copy_assign_base { + using expected_copy_assign_base::expected_copy_assign_base; +}; +#else +template struct expected_move_assign_base; +#endif + +template +struct expected_move_assign_base + : expected_copy_assign_base { + using expected_copy_assign_base::expected_copy_assign_base; + + expected_move_assign_base() = default; + expected_move_assign_base(const expected_move_assign_base &rhs) = default; + + expected_move_assign_base(expected_move_assign_base &&rhs) = default; + + expected_move_assign_base & + operator=(const expected_move_assign_base &rhs) = default; + + expected_move_assign_base & + operator=(expected_move_assign_base &&rhs) noexcept( + std::is_nothrow_move_constructible::value + &&std::is_nothrow_move_assignable::value) { + this->assign(std::move(rhs)); + return *this; + } +}; + +// expected_delete_ctor_base will conditionally delete copy and move +// constructors depending on whether T is copy/move constructible +template ::value && + std::is_copy_constructible::value), + bool EnableMove = (is_move_constructible_or_void::value && + std::is_move_constructible::value)> +struct expected_delete_ctor_base { + expected_delete_ctor_base() = default; + expected_delete_ctor_base(const expected_delete_ctor_base &) = default; + expected_delete_ctor_base(expected_delete_ctor_base &&) noexcept = default; + expected_delete_ctor_base & + operator=(const expected_delete_ctor_base &) = default; + expected_delete_ctor_base & + operator=(expected_delete_ctor_base &&) noexcept = default; +}; + +template +struct expected_delete_ctor_base { + expected_delete_ctor_base() = default; + expected_delete_ctor_base(const expected_delete_ctor_base &) = default; + expected_delete_ctor_base(expected_delete_ctor_base &&) noexcept = delete; + expected_delete_ctor_base & + operator=(const expected_delete_ctor_base &) = default; + expected_delete_ctor_base & + operator=(expected_delete_ctor_base &&) noexcept = default; +}; + +template +struct expected_delete_ctor_base { + expected_delete_ctor_base() = default; + expected_delete_ctor_base(const expected_delete_ctor_base &) = delete; + expected_delete_ctor_base(expected_delete_ctor_base &&) noexcept = default; + expected_delete_ctor_base & + operator=(const expected_delete_ctor_base &) = default; + expected_delete_ctor_base & + operator=(expected_delete_ctor_base &&) noexcept = default; +}; + +template +struct expected_delete_ctor_base { + expected_delete_ctor_base() = default; + expected_delete_ctor_base(const expected_delete_ctor_base &) = delete; + expected_delete_ctor_base(expected_delete_ctor_base &&) noexcept = delete; + expected_delete_ctor_base & + operator=(const expected_delete_ctor_base &) = default; + expected_delete_ctor_base & + operator=(expected_delete_ctor_base &&) noexcept = default; +}; + +// expected_delete_assign_base will conditionally delete copy and move +// constructors depending on whether T and E are copy/move constructible + +// assignable +template ::value && + std::is_copy_constructible::value && + is_copy_assignable_or_void::value && + std::is_copy_assignable::value), + bool EnableMove = (is_move_constructible_or_void::value && + std::is_move_constructible::value && + is_move_assignable_or_void::value && + std::is_move_assignable::value)> +struct expected_delete_assign_base { + expected_delete_assign_base() = default; + expected_delete_assign_base(const expected_delete_assign_base &) = default; + expected_delete_assign_base(expected_delete_assign_base &&) noexcept = + default; + expected_delete_assign_base & + operator=(const expected_delete_assign_base &) = default; + expected_delete_assign_base & + operator=(expected_delete_assign_base &&) noexcept = default; +}; + +template +struct expected_delete_assign_base { + expected_delete_assign_base() = default; + expected_delete_assign_base(const expected_delete_assign_base &) = default; + expected_delete_assign_base(expected_delete_assign_base &&) noexcept = + default; + expected_delete_assign_base & + operator=(const expected_delete_assign_base &) = default; + expected_delete_assign_base & + operator=(expected_delete_assign_base &&) noexcept = delete; +}; + +template +struct expected_delete_assign_base { + expected_delete_assign_base() = default; + expected_delete_assign_base(const expected_delete_assign_base &) = default; + expected_delete_assign_base(expected_delete_assign_base &&) noexcept = + default; + expected_delete_assign_base & + operator=(const expected_delete_assign_base &) = delete; + expected_delete_assign_base & + operator=(expected_delete_assign_base &&) noexcept = default; +}; + +template +struct expected_delete_assign_base { + expected_delete_assign_base() = default; + expected_delete_assign_base(const expected_delete_assign_base &) = default; + expected_delete_assign_base(expected_delete_assign_base &&) noexcept = + default; + expected_delete_assign_base & + operator=(const expected_delete_assign_base &) = delete; + expected_delete_assign_base & + operator=(expected_delete_assign_base &&) noexcept = delete; +}; + +// This is needed to be able to construct the expected_default_ctor_base which +// follows, while still conditionally deleting the default constructor. +struct default_constructor_tag { + explicit constexpr default_constructor_tag() = default; +}; + +// expected_default_ctor_base will ensure that expected has a deleted default +// constructor if T is not default constructible. +// This specialization is for when T is default constructible +template ::value || std::is_void::value> +struct expected_default_ctor_base { + constexpr expected_default_ctor_base() noexcept = default; + constexpr expected_default_ctor_base( + expected_default_ctor_base const &) noexcept = default; + constexpr expected_default_ctor_base(expected_default_ctor_base &&) noexcept = + default; + expected_default_ctor_base & + operator=(expected_default_ctor_base const &) noexcept = default; + expected_default_ctor_base & + operator=(expected_default_ctor_base &&) noexcept = default; + + constexpr explicit expected_default_ctor_base(default_constructor_tag) {} +}; + +// This specialization is for when T is not default constructible +template struct expected_default_ctor_base { + constexpr expected_default_ctor_base() noexcept = delete; + constexpr expected_default_ctor_base( + expected_default_ctor_base const &) noexcept = default; + constexpr expected_default_ctor_base(expected_default_ctor_base &&) noexcept = + default; + expected_default_ctor_base & + operator=(expected_default_ctor_base const &) noexcept = default; + expected_default_ctor_base & + operator=(expected_default_ctor_base &&) noexcept = default; + + constexpr explicit expected_default_ctor_base(default_constructor_tag) {} +}; +} // namespace detail + +template class bad_expected_access : public std::exception { +public: + explicit bad_expected_access(E e) : m_val(std::move(e)) {} + + virtual const char *what() const noexcept override { + return "Bad expected access"; + } + + const E &error() const & { return m_val; } + E &error() & { return m_val; } + const E &&error() const && { return std::move(m_val); } + E &&error() && { return std::move(m_val); } + +private: + E m_val; +}; + +/// An `expected` object is an object that contains the storage for +/// another object and manages the lifetime of this contained object `T`. +/// Alternatively it could contain the storage for another unexpected object +/// `E`. The contained object may not be initialized after the expected object +/// has been initialized, and may not be destroyed before the expected object +/// has been destroyed. The initialization state of the contained object is +/// tracked by the expected object. +template +class expected : private detail::expected_move_assign_base, + private detail::expected_delete_ctor_base, + private detail::expected_delete_assign_base, + private detail::expected_default_ctor_base { + static_assert(!std::is_reference::value, "T must not be a reference"); + static_assert(!std::is_same::type>::value, + "T must not be in_place_t"); + static_assert(!std::is_same::type>::value, + "T must not be unexpect_t"); + static_assert( + !std::is_same>::type>::value, + "T must not be unexpected"); + static_assert(!std::is_reference::value, "E must not be a reference"); + + T *valptr() { return std::addressof(this->m_val); } + const T *valptr() const { return std::addressof(this->m_val); } + unexpected *errptr() { return std::addressof(this->m_unexpect); } + const unexpected *errptr() const { + return std::addressof(this->m_unexpect); + } + + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR U &val() { + return this->m_val; + } + TL_EXPECTED_11_CONSTEXPR unexpected &err() { return this->m_unexpect; } + + template ::value> * = nullptr> + constexpr const U &val() const { + return this->m_val; + } + constexpr const unexpected &err() const { return this->m_unexpect; } + + using impl_base = detail::expected_move_assign_base; + using ctor_base = detail::expected_default_ctor_base; + +public: + typedef T value_type; + typedef E error_type; + typedef unexpected unexpected_type; + +#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \ + !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55) + template TL_EXPECTED_11_CONSTEXPR auto and_then(F &&f) & { + return and_then_impl(*this, std::forward(f)); + } + template TL_EXPECTED_11_CONSTEXPR auto and_then(F &&f) && { + return and_then_impl(std::move(*this), std::forward(f)); + } + template constexpr auto and_then(F &&f) const & { + return and_then_impl(*this, std::forward(f)); + } + +#ifndef TL_EXPECTED_NO_CONSTRR + template constexpr auto and_then(F &&f) const && { + return and_then_impl(std::move(*this), std::forward(f)); + } +#endif + +#else + template + TL_EXPECTED_11_CONSTEXPR auto + and_then(F &&f) & -> decltype(and_then_impl(std::declval(), + std::forward(f))) { + return and_then_impl(*this, std::forward(f)); + } + template + TL_EXPECTED_11_CONSTEXPR auto + and_then(F &&f) && -> decltype(and_then_impl(std::declval(), + std::forward(f))) { + return and_then_impl(std::move(*this), std::forward(f)); + } + template + constexpr auto and_then(F &&f) const & -> decltype(and_then_impl( + std::declval(), std::forward(f))) { + return and_then_impl(*this, std::forward(f)); + } + +#ifndef TL_EXPECTED_NO_CONSTRR + template + constexpr auto and_then(F &&f) const && -> decltype(and_then_impl( + std::declval(), std::forward(f))) { + return and_then_impl(std::move(*this), std::forward(f)); + } +#endif +#endif + +#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \ + !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55) + template TL_EXPECTED_11_CONSTEXPR auto map(F &&f) & { + return expected_map_impl(*this, std::forward(f)); + } + template TL_EXPECTED_11_CONSTEXPR auto map(F &&f) && { + return expected_map_impl(std::move(*this), std::forward(f)); + } + template constexpr auto map(F &&f) const & { + return expected_map_impl(*this, std::forward(f)); + } + template constexpr auto map(F &&f) const && { + return expected_map_impl(std::move(*this), std::forward(f)); + } +#else + template + TL_EXPECTED_11_CONSTEXPR decltype(expected_map_impl( + std::declval(), std::declval())) + map(F &&f) & { + return expected_map_impl(*this, std::forward(f)); + } + template + TL_EXPECTED_11_CONSTEXPR decltype(expected_map_impl(std::declval(), + std::declval())) + map(F &&f) && { + return expected_map_impl(std::move(*this), std::forward(f)); + } + template + constexpr decltype(expected_map_impl(std::declval(), + std::declval())) + map(F &&f) const & { + return expected_map_impl(*this, std::forward(f)); + } + +#ifndef TL_EXPECTED_NO_CONSTRR + template + constexpr decltype(expected_map_impl(std::declval(), + std::declval())) + map(F &&f) const && { + return expected_map_impl(std::move(*this), std::forward(f)); + } +#endif +#endif + +#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \ + !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55) + template TL_EXPECTED_11_CONSTEXPR auto transform(F &&f) & { + return expected_map_impl(*this, std::forward(f)); + } + template TL_EXPECTED_11_CONSTEXPR auto transform(F &&f) && { + return expected_map_impl(std::move(*this), std::forward(f)); + } + template constexpr auto transform(F &&f) const & { + return expected_map_impl(*this, std::forward(f)); + } + template constexpr auto transform(F &&f) const && { + return expected_map_impl(std::move(*this), std::forward(f)); + } +#else + template + TL_EXPECTED_11_CONSTEXPR decltype(expected_map_impl( + std::declval(), std::declval())) + transform(F &&f) & { + return expected_map_impl(*this, std::forward(f)); + } + template + TL_EXPECTED_11_CONSTEXPR decltype(expected_map_impl(std::declval(), + std::declval())) + transform(F &&f) && { + return expected_map_impl(std::move(*this), std::forward(f)); + } + template + constexpr decltype(expected_map_impl(std::declval(), + std::declval())) + transform(F &&f) const & { + return expected_map_impl(*this, std::forward(f)); + } + +#ifndef TL_EXPECTED_NO_CONSTRR + template + constexpr decltype(expected_map_impl(std::declval(), + std::declval())) + transform(F &&f) const && { + return expected_map_impl(std::move(*this), std::forward(f)); + } +#endif +#endif + +#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \ + !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55) + template TL_EXPECTED_11_CONSTEXPR auto map_error(F &&f) & { + return map_error_impl(*this, std::forward(f)); + } + template TL_EXPECTED_11_CONSTEXPR auto map_error(F &&f) && { + return map_error_impl(std::move(*this), std::forward(f)); + } + template constexpr auto map_error(F &&f) const & { + return map_error_impl(*this, std::forward(f)); + } + template constexpr auto map_error(F &&f) const && { + return map_error_impl(std::move(*this), std::forward(f)); + } +#else + template + TL_EXPECTED_11_CONSTEXPR decltype(map_error_impl(std::declval(), + std::declval())) + map_error(F &&f) & { + return map_error_impl(*this, std::forward(f)); + } + template + TL_EXPECTED_11_CONSTEXPR decltype(map_error_impl(std::declval(), + std::declval())) + map_error(F &&f) && { + return map_error_impl(std::move(*this), std::forward(f)); + } + template + constexpr decltype(map_error_impl(std::declval(), + std::declval())) + map_error(F &&f) const & { + return map_error_impl(*this, std::forward(f)); + } + +#ifndef TL_EXPECTED_NO_CONSTRR + template + constexpr decltype(map_error_impl(std::declval(), + std::declval())) + map_error(F &&f) const && { + return map_error_impl(std::move(*this), std::forward(f)); + } +#endif +#endif +#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \ + !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55) + template TL_EXPECTED_11_CONSTEXPR auto transform_error(F &&f) & { + return map_error_impl(*this, std::forward(f)); + } + template TL_EXPECTED_11_CONSTEXPR auto transform_error(F &&f) && { + return map_error_impl(std::move(*this), std::forward(f)); + } + template constexpr auto transform_error(F &&f) const & { + return map_error_impl(*this, std::forward(f)); + } + template constexpr auto transform_error(F &&f) const && { + return map_error_impl(std::move(*this), std::forward(f)); + } +#else + template + TL_EXPECTED_11_CONSTEXPR decltype(map_error_impl(std::declval(), + std::declval())) + transform_error(F &&f) & { + return map_error_impl(*this, std::forward(f)); + } + template + TL_EXPECTED_11_CONSTEXPR decltype(map_error_impl(std::declval(), + std::declval())) + transform_error(F &&f) && { + return map_error_impl(std::move(*this), std::forward(f)); + } + template + constexpr decltype(map_error_impl(std::declval(), + std::declval())) + transform_error(F &&f) const & { + return map_error_impl(*this, std::forward(f)); + } + +#ifndef TL_EXPECTED_NO_CONSTRR + template + constexpr decltype(map_error_impl(std::declval(), + std::declval())) + transform_error(F &&f) const && { + return map_error_impl(std::move(*this), std::forward(f)); + } +#endif +#endif + template expected TL_EXPECTED_11_CONSTEXPR or_else(F &&f) & { + return or_else_impl(*this, std::forward(f)); + } + + template expected TL_EXPECTED_11_CONSTEXPR or_else(F &&f) && { + return or_else_impl(std::move(*this), std::forward(f)); + } + + template expected constexpr or_else(F &&f) const & { + return or_else_impl(*this, std::forward(f)); + } + +#ifndef TL_EXPECTED_NO_CONSTRR + template expected constexpr or_else(F &&f) const && { + return or_else_impl(std::move(*this), std::forward(f)); + } +#endif + constexpr expected() = default; + constexpr expected(const expected &rhs) = default; + constexpr expected(expected &&rhs) = default; + expected &operator=(const expected &rhs) = default; + expected &operator=(expected &&rhs) = default; + + template ::value> * = + nullptr> + constexpr expected(in_place_t, Args &&...args) + : impl_base(in_place, std::forward(args)...), + ctor_base(detail::default_constructor_tag{}) {} + + template &, Args &&...>::value> * = nullptr> + constexpr expected(in_place_t, std::initializer_list il, Args &&...args) + : impl_base(in_place, il, std::forward(args)...), + ctor_base(detail::default_constructor_tag{}) {} + + template ::value> * = + nullptr, + detail::enable_if_t::value> * = + nullptr> + explicit constexpr expected(const unexpected &e) + : impl_base(unexpect, e.error()), + ctor_base(detail::default_constructor_tag{}) {} + + template < + class G = E, + detail::enable_if_t::value> * = + nullptr, + detail::enable_if_t::value> * = nullptr> + constexpr expected(unexpected const &e) + : impl_base(unexpect, e.error()), + ctor_base(detail::default_constructor_tag{}) {} + + template < + class G = E, + detail::enable_if_t::value> * = nullptr, + detail::enable_if_t::value> * = nullptr> + explicit constexpr expected(unexpected &&e) noexcept( + std::is_nothrow_constructible::value) + : impl_base(unexpect, std::move(e.error())), + ctor_base(detail::default_constructor_tag{}) {} + + template < + class G = E, + detail::enable_if_t::value> * = nullptr, + detail::enable_if_t::value> * = nullptr> + constexpr expected(unexpected &&e) noexcept( + std::is_nothrow_constructible::value) + : impl_base(unexpect, std::move(e.error())), + ctor_base(detail::default_constructor_tag{}) {} + + template ::value> * = + nullptr> + constexpr explicit expected(unexpect_t, Args &&...args) + : impl_base(unexpect, std::forward(args)...), + ctor_base(detail::default_constructor_tag{}) {} + + template &, Args &&...>::value> * = nullptr> + constexpr explicit expected(unexpect_t, std::initializer_list il, + Args &&...args) + : impl_base(unexpect, il, std::forward(args)...), + ctor_base(detail::default_constructor_tag{}) {} + + template ::value && + std::is_convertible::value)> * = + nullptr, + detail::expected_enable_from_other + * = nullptr> + explicit TL_EXPECTED_11_CONSTEXPR expected(const expected &rhs) + : ctor_base(detail::default_constructor_tag{}) { + if (rhs.has_value()) { + this->construct(*rhs); + } else { + this->construct_error(rhs.error()); + } + } + + template ::value && + std::is_convertible::value)> * = + nullptr, + detail::expected_enable_from_other + * = nullptr> + TL_EXPECTED_11_CONSTEXPR expected(const expected &rhs) + : ctor_base(detail::default_constructor_tag{}) { + if (rhs.has_value()) { + this->construct(*rhs); + } else { + this->construct_error(rhs.error()); + } + } + + template < + class U, class G, + detail::enable_if_t::value && + std::is_convertible::value)> * = nullptr, + detail::expected_enable_from_other * = nullptr> + explicit TL_EXPECTED_11_CONSTEXPR expected(expected &&rhs) + : ctor_base(detail::default_constructor_tag{}) { + if (rhs.has_value()) { + this->construct(std::move(*rhs)); + } else { + this->construct_error(std::move(rhs.error())); + } + } + + template < + class U, class G, + detail::enable_if_t<(std::is_convertible::value && + std::is_convertible::value)> * = nullptr, + detail::expected_enable_from_other * = nullptr> + TL_EXPECTED_11_CONSTEXPR expected(expected &&rhs) + : ctor_base(detail::default_constructor_tag{}) { + if (rhs.has_value()) { + this->construct(std::move(*rhs)); + } else { + this->construct_error(std::move(rhs.error())); + } + } + + template < + class U = T, + detail::enable_if_t::value> * = nullptr, + detail::expected_enable_forward_value * = nullptr> + explicit TL_EXPECTED_MSVC2015_CONSTEXPR expected(U &&v) + : expected(in_place, std::forward(v)) {} + + template < + class U = T, + detail::enable_if_t::value> * = nullptr, + detail::expected_enable_forward_value * = nullptr> + TL_EXPECTED_MSVC2015_CONSTEXPR expected(U &&v) + : expected(in_place, std::forward(v)) {} + + template < + class U = T, class G = T, + detail::enable_if_t::value> * = + nullptr, + detail::enable_if_t::value> * = nullptr, + detail::enable_if_t< + (!std::is_same, detail::decay_t>::value && + !detail::conjunction, + std::is_same>>::value && + std::is_constructible::value && + std::is_assignable::value && + std::is_nothrow_move_constructible::value)> * = nullptr> + expected &operator=(U &&v) { + if (has_value()) { + val() = std::forward(v); + } else { + err().~unexpected(); + ::new (valptr()) T(std::forward(v)); + this->m_has_val = true; + } + + return *this; + } + + template < + class U = T, class G = T, + detail::enable_if_t::value> * = + nullptr, + detail::enable_if_t::value> * = nullptr, + detail::enable_if_t< + (!std::is_same, detail::decay_t>::value && + !detail::conjunction, + std::is_same>>::value && + std::is_constructible::value && + std::is_assignable::value && + std::is_nothrow_move_constructible::value)> * = nullptr> + expected &operator=(U &&v) { + if (has_value()) { + val() = std::forward(v); + } else { + auto tmp = std::move(err()); + err().~unexpected(); + +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + try { + ::new (valptr()) T(std::forward(v)); + this->m_has_val = true; + } catch (...) { + err() = std::move(tmp); + throw; + } +#else + ::new (valptr()) T(std::forward(v)); + this->m_has_val = true; +#endif + } + + return *this; + } + + template ::value && + std::is_assignable::value> * = nullptr> + expected &operator=(const unexpected &rhs) { + if (!has_value()) { + err() = rhs; + } else { + this->destroy_val(); + ::new (errptr()) unexpected(rhs); + this->m_has_val = false; + } + + return *this; + } + + template ::value && + std::is_move_assignable::value> * = nullptr> + expected &operator=(unexpected &&rhs) noexcept { + if (!has_value()) { + err() = std::move(rhs); + } else { + this->destroy_val(); + ::new (errptr()) unexpected(std::move(rhs)); + this->m_has_val = false; + } + + return *this; + } + + template ::value> * = nullptr> + void emplace(Args &&...args) { + if (has_value()) { + val().~T(); + } else { + err().~unexpected(); + this->m_has_val = true; + } + ::new (valptr()) T(std::forward(args)...); + } + + template ::value> * = nullptr> + void emplace(Args &&...args) { + if (has_value()) { + val().~T(); + ::new (valptr()) T(std::forward(args)...); + } else { + auto tmp = std::move(err()); + err().~unexpected(); + +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + try { + ::new (valptr()) T(std::forward(args)...); + this->m_has_val = true; + } catch (...) { + err() = std::move(tmp); + throw; + } +#else + ::new (valptr()) T(std::forward(args)...); + this->m_has_val = true; +#endif + } + } + + template &, Args &&...>::value> * = nullptr> + void emplace(std::initializer_list il, Args &&...args) { + if (has_value()) { + T t(il, std::forward(args)...); + val() = std::move(t); + } else { + err().~unexpected(); + ::new (valptr()) T(il, std::forward(args)...); + this->m_has_val = true; + } + } + + template &, Args &&...>::value> * = nullptr> + void emplace(std::initializer_list il, Args &&...args) { + if (has_value()) { + T t(il, std::forward(args)...); + val() = std::move(t); + } else { + auto tmp = std::move(err()); + err().~unexpected(); + +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + try { + ::new (valptr()) T(il, std::forward(args)...); + this->m_has_val = true; + } catch (...) { + err() = std::move(tmp); + throw; + } +#else + ::new (valptr()) T(il, std::forward(args)...); + this->m_has_val = true; +#endif + } + } + +private: + using t_is_void = std::true_type; + using t_is_not_void = std::false_type; + using t_is_nothrow_move_constructible = std::true_type; + using move_constructing_t_can_throw = std::false_type; + using e_is_nothrow_move_constructible = std::true_type; + using move_constructing_e_can_throw = std::false_type; + + void swap_where_both_have_value(expected & /*rhs*/, t_is_void) noexcept { + // swapping void is a no-op + } + + void swap_where_both_have_value(expected &rhs, t_is_not_void) { + using std::swap; + swap(val(), rhs.val()); + } + + void swap_where_only_one_has_value(expected &rhs, t_is_void) noexcept( + std::is_nothrow_move_constructible::value) { + ::new (errptr()) unexpected_type(std::move(rhs.err())); + rhs.err().~unexpected_type(); + std::swap(this->m_has_val, rhs.m_has_val); + } + + void swap_where_only_one_has_value(expected &rhs, t_is_not_void) { + swap_where_only_one_has_value_and_t_is_not_void( + rhs, typename std::is_nothrow_move_constructible::type{}, + typename std::is_nothrow_move_constructible::type{}); + } + + void swap_where_only_one_has_value_and_t_is_not_void( + expected &rhs, t_is_nothrow_move_constructible, + e_is_nothrow_move_constructible) noexcept { + auto temp = std::move(val()); + val().~T(); + ::new (errptr()) unexpected_type(std::move(rhs.err())); + rhs.err().~unexpected_type(); + ::new (rhs.valptr()) T(std::move(temp)); + std::swap(this->m_has_val, rhs.m_has_val); + } + + void swap_where_only_one_has_value_and_t_is_not_void( + expected &rhs, t_is_nothrow_move_constructible, + move_constructing_e_can_throw) { + auto temp = std::move(val()); + val().~T(); +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + try { + ::new (errptr()) unexpected_type(std::move(rhs.err())); + rhs.err().~unexpected_type(); + ::new (rhs.valptr()) T(std::move(temp)); + std::swap(this->m_has_val, rhs.m_has_val); + } catch (...) { + val() = std::move(temp); + throw; + } +#else + ::new (errptr()) unexpected_type(std::move(rhs.err())); + rhs.err().~unexpected_type(); + ::new (rhs.valptr()) T(std::move(temp)); + std::swap(this->m_has_val, rhs.m_has_val); +#endif + } + + void swap_where_only_one_has_value_and_t_is_not_void( + expected &rhs, move_constructing_t_can_throw, + e_is_nothrow_move_constructible) { + auto temp = std::move(rhs.err()); + rhs.err().~unexpected_type(); +#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED + try { + ::new (rhs.valptr()) T(std::move(val())); + val().~T(); + ::new (errptr()) unexpected_type(std::move(temp)); + std::swap(this->m_has_val, rhs.m_has_val); + } catch (...) { + rhs.err() = std::move(temp); + throw; + } +#else + ::new (rhs.valptr()) T(std::move(val())); + val().~T(); + ::new (errptr()) unexpected_type(std::move(temp)); + std::swap(this->m_has_val, rhs.m_has_val); +#endif + } + +public: + template + detail::enable_if_t::value && + detail::is_swappable::value && + (std::is_nothrow_move_constructible::value || + std::is_nothrow_move_constructible::value)> + swap(expected &rhs) noexcept( + std::is_nothrow_move_constructible::value + &&detail::is_nothrow_swappable::value + &&std::is_nothrow_move_constructible::value + &&detail::is_nothrow_swappable::value) { + if (has_value() && rhs.has_value()) { + swap_where_both_have_value(rhs, typename std::is_void::type{}); + } else if (!has_value() && rhs.has_value()) { + rhs.swap(*this); + } else if (has_value()) { + swap_where_only_one_has_value(rhs, typename std::is_void::type{}); + } else { + using std::swap; + swap(err(), rhs.err()); + } + } + + constexpr const T *operator->() const { + TL_ASSERT(has_value()); + return valptr(); + } + TL_EXPECTED_11_CONSTEXPR T *operator->() { + TL_ASSERT(has_value()); + return valptr(); + } + + template ::value> * = nullptr> + constexpr const U &operator*() const & { + TL_ASSERT(has_value()); + return val(); + } + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR U &operator*() & { + TL_ASSERT(has_value()); + return val(); + } + template ::value> * = nullptr> + constexpr const U &&operator*() const && { + TL_ASSERT(has_value()); + return std::move(val()); + } + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR U &&operator*() && { + TL_ASSERT(has_value()); + return std::move(val()); + } + + constexpr bool has_value() const noexcept { return this->m_has_val; } + constexpr explicit operator bool() const noexcept { return this->m_has_val; } + + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR const U &value() const & { + if (!has_value()) + detail::throw_exception(bad_expected_access(err().error())); + return val(); + } + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR U &value() & { + if (!has_value()) + detail::throw_exception(bad_expected_access(err().error())); + return val(); + } + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR const U &&value() const && { + if (!has_value()) + detail::throw_exception(bad_expected_access(std::move(err()).error())); + return std::move(val()); + } + template ::value> * = nullptr> + TL_EXPECTED_11_CONSTEXPR U &&value() && { + if (!has_value()) + detail::throw_exception(bad_expected_access(std::move(err()).error())); + return std::move(val()); + } + + constexpr const E &error() const & { + TL_ASSERT(!has_value()); + return err().error(); + } + TL_EXPECTED_11_CONSTEXPR E &error() & { + TL_ASSERT(!has_value()); + return err().error(); + } + constexpr const E &&error() const && { + TL_ASSERT(!has_value()); + return std::move(err().error()); + } + TL_EXPECTED_11_CONSTEXPR E &&error() && { + TL_ASSERT(!has_value()); + return std::move(err().error()); + } + + template constexpr T value_or(U &&v) const & { + static_assert(std::is_copy_constructible::value && + std::is_convertible::value, + "T must be copy-constructible and convertible to from U&&"); + return bool(*this) ? **this : static_cast(std::forward(v)); + } + template TL_EXPECTED_11_CONSTEXPR T value_or(U &&v) && { + static_assert(std::is_move_constructible::value && + std::is_convertible::value, + "T must be move-constructible and convertible to from U&&"); + return bool(*this) ? std::move(**this) : static_cast(std::forward(v)); + } +}; + +namespace detail { +template using exp_t = typename detail::decay_t::value_type; +template using err_t = typename detail::decay_t::error_type; +template using ret_t = expected>; + +#ifdef TL_EXPECTED_CXX14 +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + *std::declval()))> +constexpr auto and_then_impl(Exp &&exp, F &&f) { + static_assert(detail::is_expected::value, "F must return an expected"); + + return exp.has_value() + ? detail::invoke(std::forward(f), *std::forward(exp)) + : Ret(unexpect, std::forward(exp).error()); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval()))> +constexpr auto and_then_impl(Exp &&exp, F &&f) { + static_assert(detail::is_expected::value, "F must return an expected"); + + return exp.has_value() ? detail::invoke(std::forward(f)) + : Ret(unexpect, std::forward(exp).error()); +} +#else +template struct TC; +template (), + *std::declval())), + detail::enable_if_t>::value> * = nullptr> +auto and_then_impl(Exp &&exp, F &&f) -> Ret { + static_assert(detail::is_expected::value, "F must return an expected"); + + return exp.has_value() + ? detail::invoke(std::forward(f), *std::forward(exp)) + : Ret(unexpect, std::forward(exp).error()); +} + +template ())), + detail::enable_if_t>::value> * = nullptr> +constexpr auto and_then_impl(Exp &&exp, F &&f) -> Ret { + static_assert(detail::is_expected::value, "F must return an expected"); + + return exp.has_value() ? detail::invoke(std::forward(f)) + : Ret(unexpect, std::forward(exp).error()); +} +#endif + +#ifdef TL_EXPECTED_CXX14 +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + *std::declval())), + detail::enable_if_t::value> * = nullptr> +constexpr auto expected_map_impl(Exp &&exp, F &&f) { + using result = ret_t>; + return exp.has_value() ? result(detail::invoke(std::forward(f), + *std::forward(exp))) + : result(unexpect, std::forward(exp).error()); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + *std::declval())), + detail::enable_if_t::value> * = nullptr> +auto expected_map_impl(Exp &&exp, F &&f) { + using result = expected>; + if (exp.has_value()) { + detail::invoke(std::forward(f), *std::forward(exp)); + return result(); + } + + return result(unexpect, std::forward(exp).error()); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval())), + detail::enable_if_t::value> * = nullptr> +constexpr auto expected_map_impl(Exp &&exp, F &&f) { + using result = ret_t>; + return exp.has_value() ? result(detail::invoke(std::forward(f))) + : result(unexpect, std::forward(exp).error()); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval())), + detail::enable_if_t::value> * = nullptr> +auto expected_map_impl(Exp &&exp, F &&f) { + using result = expected>; + if (exp.has_value()) { + detail::invoke(std::forward(f)); + return result(); + } + + return result(unexpect, std::forward(exp).error()); +} +#else +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + *std::declval())), + detail::enable_if_t::value> * = nullptr> + +constexpr auto expected_map_impl(Exp &&exp, F &&f) + -> ret_t> { + using result = ret_t>; + + return exp.has_value() ? result(detail::invoke(std::forward(f), + *std::forward(exp))) + : result(unexpect, std::forward(exp).error()); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + *std::declval())), + detail::enable_if_t::value> * = nullptr> + +auto expected_map_impl(Exp &&exp, F &&f) -> expected> { + if (exp.has_value()) { + detail::invoke(std::forward(f), *std::forward(exp)); + return {}; + } + + return unexpected>(std::forward(exp).error()); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval())), + detail::enable_if_t::value> * = nullptr> + +constexpr auto expected_map_impl(Exp &&exp, F &&f) + -> ret_t> { + using result = ret_t>; + + return exp.has_value() ? result(detail::invoke(std::forward(f))) + : result(unexpect, std::forward(exp).error()); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval())), + detail::enable_if_t::value> * = nullptr> + +auto expected_map_impl(Exp &&exp, F &&f) -> expected> { + if (exp.has_value()) { + detail::invoke(std::forward(f)); + return {}; + } + + return unexpected>(std::forward(exp).error()); +} +#endif + +#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \ + !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55) +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +constexpr auto map_error_impl(Exp &&exp, F &&f) { + using result = expected, detail::decay_t>; + return exp.has_value() + ? result(*std::forward(exp)) + : result(unexpect, detail::invoke(std::forward(f), + std::forward(exp).error())); +} +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +auto map_error_impl(Exp &&exp, F &&f) { + using result = expected, monostate>; + if (exp.has_value()) { + return result(*std::forward(exp)); + } + + detail::invoke(std::forward(f), std::forward(exp).error()); + return result(unexpect, monostate{}); +} +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +constexpr auto map_error_impl(Exp &&exp, F &&f) { + using result = expected, detail::decay_t>; + return exp.has_value() + ? result() + : result(unexpect, detail::invoke(std::forward(f), + std::forward(exp).error())); +} +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +auto map_error_impl(Exp &&exp, F &&f) { + using result = expected, monostate>; + if (exp.has_value()) { + return result(); + } + + detail::invoke(std::forward(f), std::forward(exp).error()); + return result(unexpect, monostate{}); +} +#else +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +constexpr auto map_error_impl(Exp &&exp, F &&f) + -> expected, detail::decay_t> { + using result = expected, detail::decay_t>; + + return exp.has_value() + ? result(*std::forward(exp)) + : result(unexpect, detail::invoke(std::forward(f), + std::forward(exp).error())); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +auto map_error_impl(Exp &&exp, F &&f) -> expected, monostate> { + using result = expected, monostate>; + if (exp.has_value()) { + return result(*std::forward(exp)); + } + + detail::invoke(std::forward(f), std::forward(exp).error()); + return result(unexpect, monostate{}); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +constexpr auto map_error_impl(Exp &&exp, F &&f) + -> expected, detail::decay_t> { + using result = expected, detail::decay_t>; + + return exp.has_value() + ? result() + : result(unexpect, detail::invoke(std::forward(f), + std::forward(exp).error())); +} + +template >::value> * = nullptr, + class Ret = decltype(detail::invoke(std::declval(), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +auto map_error_impl(Exp &&exp, F &&f) -> expected, monostate> { + using result = expected, monostate>; + if (exp.has_value()) { + return result(); + } + + detail::invoke(std::forward(f), std::forward(exp).error()); + return result(unexpect, monostate{}); +} +#endif + +#ifdef TL_EXPECTED_CXX14 +template (), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +constexpr auto or_else_impl(Exp &&exp, F &&f) { + static_assert(detail::is_expected::value, "F must return an expected"); + return exp.has_value() ? std::forward(exp) + : detail::invoke(std::forward(f), + std::forward(exp).error()); +} + +template (), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +detail::decay_t or_else_impl(Exp &&exp, F &&f) { + return exp.has_value() ? std::forward(exp) + : (detail::invoke(std::forward(f), + std::forward(exp).error()), + std::forward(exp)); +} +#else +template (), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +auto or_else_impl(Exp &&exp, F &&f) -> Ret { + static_assert(detail::is_expected::value, "F must return an expected"); + return exp.has_value() ? std::forward(exp) + : detail::invoke(std::forward(f), + std::forward(exp).error()); +} + +template (), + std::declval().error())), + detail::enable_if_t::value> * = nullptr> +detail::decay_t or_else_impl(Exp &&exp, F &&f) { + return exp.has_value() ? std::forward(exp) + : (detail::invoke(std::forward(f), + std::forward(exp).error()), + std::forward(exp)); +} +#endif +} // namespace detail + +template +constexpr bool operator==(const expected &lhs, + const expected &rhs) { + return (lhs.has_value() != rhs.has_value()) + ? false + : (!lhs.has_value() ? lhs.error() == rhs.error() : *lhs == *rhs); +} +template +constexpr bool operator!=(const expected &lhs, + const expected &rhs) { + return (lhs.has_value() != rhs.has_value()) + ? true + : (!lhs.has_value() ? lhs.error() != rhs.error() : *lhs != *rhs); +} +template +constexpr bool operator==(const expected &lhs, + const expected &rhs) { + return (lhs.has_value() != rhs.has_value()) + ? false + : (!lhs.has_value() ? lhs.error() == rhs.error() : true); +} +template +constexpr bool operator!=(const expected &lhs, + const expected &rhs) { + return (lhs.has_value() != rhs.has_value()) + ? true + : (!lhs.has_value() ? lhs.error() != rhs.error() : false); +} + +template +constexpr bool operator==(const expected &x, const U &v) { + return x.has_value() ? *x == v : false; +} +template +constexpr bool operator==(const U &v, const expected &x) { + return x.has_value() ? *x == v : false; +} +template +constexpr bool operator!=(const expected &x, const U &v) { + return x.has_value() ? *x != v : true; +} +template +constexpr bool operator!=(const U &v, const expected &x) { + return x.has_value() ? *x != v : true; +} + +template +constexpr bool operator==(const expected &x, const unexpected &e) { + return x.has_value() ? false : x.error() == e.error(); +} +template +constexpr bool operator==(const unexpected &e, const expected &x) { + return x.has_value() ? false : x.error() == e.error(); +} +template +constexpr bool operator!=(const expected &x, const unexpected &e) { + return x.has_value() ? true : x.error() != e.error(); +} +template +constexpr bool operator!=(const unexpected &e, const expected &x) { + return x.has_value() ? true : x.error() != e.error(); +} + +template ::value || + std::is_move_constructible::value) && + detail::is_swappable::value && + std::is_move_constructible::value && + detail::is_swappable::value> * = nullptr> +void swap(expected &lhs, + expected &rhs) noexcept(noexcept(lhs.swap(rhs))) { + lhs.swap(rhs); +} +} // namespace q23 +QT_END_NAMESPACE + +#endif diff --git a/src/corelib/global/qt_attribution.json b/src/corelib/global/qt_attribution.json new file mode 100644 index 00000000000..22379e26191 --- /dev/null +++ b/src/corelib/global/qt_attribution.json @@ -0,0 +1,14 @@ +{ + "Id": "tlexpected", + "Name": "tl::expected", + "QDocModule": "qtcore", + "QtUsage": "Available as a private type in all Qt modules", + "Description": "Single header implementation of std::expected with functional-style extensions.", + "Files": [ "qexpected_p.h" ], + "Homepage": "https://github.com/TartanLlama/expected/", + "Version": "41d3e1f48d682992a2230b2a715bca38b848b269", + "DownloadLocation": "https://github.com/TartanLlama/expected/blob/41d3e1f48d682992a2230b2a715bca38b848b269/include/tl/expected.hpp", + "License": "Creative Commons Zero v1.0 Universal", + "LicenseId": "CC0-1.0", + "Copyright": "To the extent possible under law, Sy Brand has waived all copyright and related or neighboring rights to the expected library. This work is published from: United Kingdom." +}