__cxx03/__iterator/ranges_iterator_traits.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___CXX03___ITERATOR_RANGES_ITERATOR_TRAITS_H
0011 #define _LIBCPP___CXX03___ITERATOR_RANGES_ITERATOR_TRAITS_H
0012
0013 #include <__cxx03/__config>
0014 #include <__cxx03/__fwd/pair.h>
0015 #include <__cxx03/__ranges/concepts.h>
0016 #include <__cxx03/__type_traits/remove_const.h>
0017
0018 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0019 #  pragma GCC system_header
0020 #endif
0021
0022 _LIBCPP_BEGIN_NAMESPACE_STD
0023
0024 #if _LIBCPP_STD_VER >= 23
0025
0026 template <ranges::input_range _Range>
0027 using __range_key_type = __remove_const_t<typename ranges::range_value_t<_Range>::first_type>;
0028
0029 template <ranges::input_range _Range>
0030 using __range_mapped_type = typename ranges::range_value_t<_Range>::second_type;
0031
0032 template <ranges::input_range _Range>
0033 using __range_to_alloc_type =
0034     pair<const typename ranges::range_value_t<_Range>::first_type, typename ranges::range_value_t<_Range>::second_type>;
0035
0036 #endif
0037
0038 _LIBCPP_END_NAMESPACE_STD
0039
0040 #endif // _LIBCPP___CXX03___ITERATOR_RANGES_ITERATOR_TRAITS_H