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QSpan: check conversion from initializer_list

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The docs at cppreference.com hint at a corresponding ctor being added
for C++26 (though I don't see it in eel.is/c++draft, yet).

Even so, replacing former initializer_list functions with QSpan ones
is definitely one of the upcoming use-cases, so test it.

Can't use from_container_impl() here as initializer_list<T> is already
immutable, so QSpan<int> is not compatible, only QSpan<const int>.

Change-Id: Iecdf29e629d48313edd5e56d358b9137da76deb6
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit c851fb2456a87d7b19e7fb9a5a61a3b631970026)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Marc Mutz 2023-12-06 14:30:28 +01:00 committed by Qt Cherry-pick Bot
parent 89e8253de5
commit 1945c5f40c
1 changed files with 16 additions and 0 deletions
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16
tests/auto/corelib/tools/qspan/tst_qspan.cpp
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@ -71,6 +71,7 @@ private Q_SLOTS:
void zeroExtentSpansMaintainADataPointer() const; void zeroExtentSpansMaintainADataPointer() const;
void fromArray() const; void fromArray() const;
void fromStdArray() const; void fromStdArray() const;
void fromStdInitializerList() const;
void fromZeroSizeStdArray() const; void fromZeroSizeStdArray() const;
void fromStdVector() const; void fromStdVector() const;
void fromQList() const; void fromQList() const;
@ -331,6 +332,21 @@ void tst_QSpan::fromStdArray() const
from_container_impl<4>(ai); from_container_impl<4>(ai);
} }
void tst_QSpan::fromStdInitializerList() const
{
std::initializer_list<int> il = {42, 84, 168, 336};
QSpan sci = il; // CTAD
// special case: always deduced as <const int>:
static_assert(std::is_same_v<decltype(sci), QSpan<const int>>);
QCOMPARE_EQ(sci.size(), qsizetype(il.size()));
QCOMPARE_EQ(sci.data(), il.begin());
check_nonempty_span(sci, 4);
RETURN_IF_FAILED();
}
void tst_QSpan::fromZeroSizeStdArray() const void tst_QSpan::fromZeroSizeStdArray() const
{ {
std::array<int, 0> ai = {}; std::array<int, 0> ai = {};