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libstdc++: Only define __any_input_iterator for C++20

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Currently this new concept will get defined for -std=c++17 -fconcepts
but as it uses std::input_iterator, which is new in C++20, that won't
work. Guard it with __cpp_lib_concepts as well as __cpp_concepts.

libstdc++-v3/ChangeLog:

	* include/bits/stl_iterator_base_types.h (__any_input_iterator):
	Only define when __cpp_lib_concepts is defined.
This commit is contained in:
Jonathan Wakely
2025-07-19 00:08:26 +01:00
committed by Jonathan Wakely
parent 22d8b89689
commit 152d4e3cf1
1 changed files with 2 additions and 0 deletions
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libstdc++-v3/include/bits/stl_iterator_base_types.h
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@ -258,10 +258,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
concept __has_input_iter_cat
= is_convertible_v<__iter_category_t<_InIter>, input_iterator_tag>;
#ifdef __cpp_lib_concepts
// Is a Cpp17InputIterator or satisfies std::input_iterator.
template<typename _InIterator>
concept __any_input_iterator
= input_iterator<_InIterator> || __has_input_iter_cat<_InIterator>;
#endif
#endif
template<typename _It,