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libstdc++: missing constexpr for __[nm]iter_base [PR102358]

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PR libstdc++/102358

libstdc++-v3/ChangeLog:

	* include/bits/stl_iterator.h (__niter_base): Make constexpr
	for C++20.
	(__miter_base): Likewise.
	* testsuite/25_algorithms/move/constexpr.cc: New test.
This commit is contained in:
Patrick Palka 2021-10-21 12:13:35 -04:00
parent 9262ae450d
commit 5f7976f65b
2 changed files with 21 additions and 0 deletions
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2
libstdc++-v3/include/bits/stl_iterator.h
View File

@ -2472,6 +2472,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// @} group iterators
template<typename _Iterator>
_GLIBCXX20_CONSTEXPR
auto
__niter_base(move_iterator<_Iterator> __it)
-> decltype(make_move_iterator(__niter_base(__it.base())))
@ -2485,6 +2486,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
};
template<typename _Iterator>
_GLIBCXX20_CONSTEXPR
auto
__miter_base(move_iterator<_Iterator> __it)
-> decltype(__miter_base(__it.base()))

19
libstdc++-v3/testsuite/25_algorithms/move/constexpr.cc Normal file
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@ -0,0 +1,19 @@
// { dg-options "-std=gnu++20" }
// { dg-do compile { target c++20 } }
#include <algorithm>
#include <span>
constexpr bool
test01()
{
// PR libstdc++/102358
int x[2] = {1,2}, y[2];
std::span in(x), out(y);
std::move(std::move_iterator(in.begin()), std::move_iterator(in.end()),
out.begin());
return std::equal(std::move_iterator(in.begin()), std::move_iterator(in.end()),
std::move_iterator(out.begin()));
}
static_assert(test01());