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[llvm-project.git] / libcxx / include / __iterator / ranges_iterator_traits.h
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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 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP___ITERATOR_RANGES_ITERATOR_TRAITS_H
11 #define _LIBCPP___ITERATOR_RANGES_ITERATOR_TRAITS_H
13 #include <__config>
14 #include <__fwd/pair.h>
15 #include <__ranges/concepts.h>
16 #include <__type_traits/remove_const.h>
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 # pragma GCC system_header
20 #endif
22 _LIBCPP_BEGIN_NAMESPACE_STD
24 #if _LIBCPP_STD_VER >= 23
26 template <ranges::input_range _Range>
27 using __range_key_type _LIBCPP_NODEBUG = __remove_const_t<typename ranges::range_value_t<_Range>::first_type>;
29 template <ranges::input_range _Range>
30 using __range_mapped_type _LIBCPP_NODEBUG = typename ranges::range_value_t<_Range>::second_type;
32 template <ranges::input_range _Range>
33 using __range_to_alloc_type _LIBCPP_NODEBUG =
34 pair<const typename ranges::range_value_t<_Range>::first_type, typename ranges::range_value_t<_Range>::second_type>;
36 #endif
38 _LIBCPP_END_NAMESPACE_STD
40 #endif // _LIBCPP___ITERATOR_RANGES_ITERATOR_TRAITS_H