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libstdc++: Add constexpr to std::counted_iterator post-increment (LWG 3643)

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libstdc++-v3/ChangeLog:

	* include/bits/stl_iterator.h (counted_iterator::operator++(int)):
	Add 'constexpr' as per LWG 3643.
	* testsuite/24_iterators/counted_iterator/lwg3643.cc: New test.

(cherry picked from commit 47b20d027a)
This commit is contained in:
Jonathan Wakely 2022-05-26 12:41:03 +01:00
parent 5647e401bb
commit 7be1dd924d
2 changed files with 28 additions and 2 deletions
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3
libstdc++-v3/include/bits/stl_iterator.h
View File

@ -2341,7 +2341,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
return *this;
}
decltype(auto)
constexpr decltype(auto)
operator++(int)
{
__glibcxx_assert(_M_length > 0);
@ -2353,7 +2353,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
++_M_length;
__throw_exception_again;
}
}
constexpr counted_iterator

27
libstdc++-v3/testsuite/24_iterators/counted_iterator/lwg3643.cc Normal file
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@ -0,0 +1,27 @@
// { dg-options "-std=gnu++20" }
// { dg-do compile { target c++20 } }
#include <iterator>
struct InputIterator
{
using difference_type = int;
using value_type = int;
constexpr int operator*() const noexcept { return 0; }
InputIterator& operator++() { return *this; }
constexpr void operator++(int) { }
};
static_assert( std::input_iterator<InputIterator> );
static_assert( !std::forward_iterator<InputIterator> );
constexpr bool
test_lwg3643()
{
std::counted_iterator<InputIterator> iter({}, 1);
iter++;
return iter == std::default_sentinel;
}
static_assert( test_lwg3643() );