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libstdc++: Use requires-clause for __normal_iterator constructor

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This is a very minor throughput optimization, to avoid instantiating
std::enable_if and std::is_convertible when concepts are available.

libstdc++-v3/ChangeLog:

	* include/bits/stl_iterator.h (__normal_iterator): Replace
	enable_if constraint with requires-clause.
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Jonathan Wakely 2024-11-14 14:54:57 +00:00 committed by Jonathan Wakely
parent e56d183c15
commit dec2158b2c
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1 changed files with 5 additions and 1 deletions
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6
libstdc++-v3/include/bits/stl_iterator.h
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@ -1030,7 +1030,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
typedef std::iterator_traits<_Iterator> __traits_type;
#if __cplusplus >= 201103L
#if __cplusplus >= 201103L && ! defined __glibcxx_concepts
template<typename _Iter>
using __convertible_from
= std::__enable_if_t<std::is_convertible<_Iter, _Iterator>::value>;
@ -1060,7 +1060,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Allow iterator to const_iterator conversion
#if __cplusplus >= 201103L
# ifdef __glibcxx_concepts
template<typename _Iter> requires std::is_convertible_v<_Iter, _Iterator>
# else
template<typename _Iter, typename = __convertible_from<_Iter>>
# endif
[[__gnu__::__always_inline__]]
constexpr
__normal_iterator(const __normal_iterator<_Iter, _Container>& __i)