libcxx/include/__algorithm/ranges_minmax_element.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_RANGES_MINMAX_ELEMENT_H
  10 #define _LIBCPP___ALGORITHM_RANGES_MINMAX_ELEMENT_H
  11
  12 #include <__algorithm/min_max_result.h>
  13 #include <__algorithm/minmax_element.h>
  14 #include <__config>
  15 #include <__functional/identity.h>
  16 #include <__functional/invoke.h>
  17 #include <__functional/ranges_operations.h>
  18 #include <__iterator/concepts.h>
  19 #include <__iterator/projected.h>
  20 #include <__ranges/access.h>
  21 #include <__ranges/concepts.h>
  22 #include <__ranges/dangling.h>
  23 #include <__utility/forward.h>
  24 #include <__utility/move.h>
  25 #include <__utility/pair.h>
  26
  27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  28 #  pragma GCC system_header
  29 #endif
  30
  31 #if _LIBCPP_STD_VER >= 20
  32
  33 _LIBCPP_BEGIN_NAMESPACE_STD
  34
  35 namespace ranges {
  36
  37 template <class _T1>
  38 using minmax_element_result = min_max_result<_T1>;
  39
  40 namespace __minmax_element {
  41 struct __fn {
  42   template <forward_iterator _Ip,
  43             sentinel_for<_Ip> _Sp,
  44             class _Proj                                             = identity,
  45             indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
  46   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr ranges::minmax_element_result<_Ip>
  47   operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
  48     auto __ret = std::__minmax_element_impl(std::move(__first), std::move(__last), __comp, __proj);
  49     return {__ret.first, __ret.second};
  50   }
  51
  52   template <forward_range _Rp,
  53             class _Proj                                                         = identity,
  54             indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
  55   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr ranges::minmax_element_result<borrowed_iterator_t<_Rp>>
  56   operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
  57     auto __ret = std::__minmax_element_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
  58     return {__ret.first, __ret.second};
  59   }
  60 };
  61 } // namespace __minmax_element
  62
  63 inline namespace __cpo {
  64 inline constexpr auto minmax_element = __minmax_element::__fn{};
  65 } // namespace __cpo
  66
  67 } // namespace ranges
  68
  69 _LIBCPP_END_NAMESPACE_STD
  70
  71 #endif // _LIBCPP_STD_VER >= 20
  72
  73 #endif // _LIBCPP___ALGORITHM_RANGES_MINMAX_H