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Fix error on MSVC when QList with disabled rvalues is instantiated

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MSVC does in some case full instantiation of the template. Make sure
all of it expands to valid C++, even in the case where those methods
are supposed to be disabled.

Fixes: QTBUG-86289
Change-Id: Iaae39ef60fc5cf5fee273b0934a5a52b6ae4ec17
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
This commit is contained in:
Lars Knoll 2020-08-29 19:13:15 +02:00
parent aa136d46e1
commit fc80bd201c
1 changed files with 32 additions and 6 deletions
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38
src/corelib/tools/qlist.h
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@ -312,7 +312,14 @@ public:
const_reference operator[](qsizetype i) const noexcept { return at(i); }
void append(parameter_type t) { emplaceBack(t); }
void append(const_iterator i1, const_iterator i2);
void append(rvalue_ref t) { emplaceBack(std::move(t)); }
void append(rvalue_ref t)
{
if constexpr (DataPointer::pass_parameter_by_value) {
Q_UNUSED(t);
} else {
emplaceBack(std::move(t));
}
}
void append(const QList<T> &l)
{
// protect against l == *this
@ -320,7 +327,13 @@ public:
append(list.constBegin(), list.constEnd());
}
void append(QList<T> &&l);
void prepend(rvalue_ref t) { emplaceFront(std::move(t)); }
void prepend(rvalue_ref t) {
if constexpr (DataPointer::pass_parameter_by_value) {
Q_UNUSED(t);
} else {
emplaceFront(std::move(t));
}
}
void prepend(parameter_type t) { emplaceFront(t); }
template<typename... Args>
@ -347,7 +360,15 @@ public:
Q_ASSERT_X(isValidIterator(before), "QList::insert", "The specified iterator argument 'before' is invalid");
return insert(std::distance(constBegin(), before), std::move(t));
}
iterator insert(qsizetype i, rvalue_ref t) { return emplace(i, std::move(t)); }
iterator insert(qsizetype i, rvalue_ref t) {
if constexpr (DataPointer::pass_parameter_by_value) {
Q_UNUSED(i);
Q_UNUSED(t);
return end();
} else {
return emplace(i, std::move(t));
}
}
template <typename ...Args>
iterator emplace(const_iterator before, Args&&... args)
@ -371,9 +392,14 @@ public:
}
void replace(qsizetype i, rvalue_ref t)
{
Q_ASSERT_X(i >= 0 && i < d->size, "QList<T>::replace", "index out of range");
const T copy(std::move(t));
data()[i] = std::move(copy);
if constexpr (DataPointer::pass_parameter_by_value) {
Q_UNUSED(i);
Q_UNUSED(t);
} else {
Q_ASSERT_X(i >= 0 && i < d->size, "QList<T>::replace", "index out of range");
const T copy(std::move(t));
data()[i] = std::move(copy);
}
}
void remove(qsizetype i, qsizetype n = 1);