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/remove_const.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 #if _LIBCPP_STD_VER >= 23 25 26 template <ranges::input_range _Range> 27 using __range_key_type = __remove_const_t<typename ranges::range_value_t<_Range>::first_type>; 28 29 template <ranges::input_range _Range> 30 using __range_mapped_type = typename ranges::range_value_t<_Range>::second_type; 31 32 template <ranges::input_range _Range> 33 using __range_to_alloc_type = 34 pair<const typename ranges::range_value_t<_Range>::first_type, typename ranges::range_value_t<_Range>::second_type>; 35 36 #endif 37 38 _LIBCPP_END_NAMESPACE_STD 39 40 #endif // _LIBCPP___ITERATOR_RANGES_ITERATOR_TRAITS_H 41