1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___ITERATOR_RANGES_ITERATOR_TRAITS_H 11 #define _LIBCPP___ITERATOR_RANGES_ITERATOR_TRAITS_H 12 13 #include <__config> 14 #include <__fwd/pair.h> 15 #include <__ranges/concepts.h> 16 #include <__type_traits/add_const.h> 17 #include <__type_traits/remove_const.h> 18 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 # pragma GCC system_header 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 #if _LIBCPP_STD_VER >= 23 26 27 template <ranges::input_range _Range> 28 using __range_key_type = __remove_const_t<typename ranges::range_value_t<_Range>::first_type>; 29 30 template <ranges::input_range _Range> 31 using __range_mapped_type = typename ranges::range_value_t<_Range>::second_type; 32 33 template <ranges::input_range _Range> 34 using __range_to_alloc_type = 35 pair<add_const_t<typename ranges::range_value_t<_Range>::first_type>, 36 typename ranges::range_value_t<_Range>::second_type>; 37 38 #endif 39 40 _LIBCPP_END_NAMESPACE_STD 41 42 #endif // _LIBCPP___ITERATOR_RANGES_ITERATOR_TRAITS_H 43