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