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Update string_view.hpp to use BOOST_NO_CXX20_HDR_CONCEPTS

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Peter Dimov
2021-12-18 18:39:03 +02:00
parent 6e6af5fc90
commit 574c7cf86e
1 changed files with 2 additions and 3 deletions
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5
include/boost/core/detail/string_view.hpp
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@ -31,9 +31,8 @@
#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
# include <string_view>
#endif
#if BOOST_CXX_VERSION >= 202000L
#if !defined(BOOST_NO_CXX20_HDR_CONCEPTS) // std::common_reference_with
# include <type_traits>
# include <version>
#endif
namespace boost
@ -1223,7 +1222,7 @@ typedef basic_string_view<char8_t> u8string_view;
// std::common_reference support
// needed for iterators that have reference=string_view and value_type=std::string
#if BOOST_CXX_VERSION >= 202000L && defined(__cpp_lib_concepts) && __cpp_lib_concepts >= 201907L
#if !defined(BOOST_NO_CXX20_HDR_CONCEPTS)
template<class Ch, class A, template<class> class Q1, template<class> class Q2>
struct std::basic_common_reference<