libcxx/include/__algorithm/ranges_is_heap.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_IS_HEAP_H
  10 #define _LIBCPP___ALGORITHM_RANGES_IS_HEAP_H
  11
  12 #include <__algorithm/is_heap_until.h>
  13 #include <__algorithm/make_projected.h>
  14 #include <__config>
  15 #include <__functional/identity.h>
  16 #include <__functional/ranges_operations.h>
  17 #include <__iterator/concepts.h>
  18 #include <__iterator/iterator_traits.h>
  19 #include <__iterator/next.h>
  20 #include <__iterator/projected.h>
  21 #include <__ranges/access.h>
  22 #include <__ranges/concepts.h>
  23 #include <__utility/move.h>
  24
  25 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  26 #  pragma GCC system_header
  27 #endif
  28
  29 #if _LIBCPP_STD_VER >= 20
  30
  31 _LIBCPP_BEGIN_NAMESPACE_STD
  32
  33 namespace ranges {
  34 namespace __is_heap {
  35
  36 struct __fn {
  37   template <class _Iter, class _Sent, class _Proj, class _Comp>
  38   _LIBCPP_HIDE_FROM_ABI constexpr static bool
  39   __is_heap_fn_impl(_Iter __first, _Sent __last, _Comp& __comp, _Proj& __proj) {
  40     auto __last_iter        = ranges::next(__first, __last);
  41     auto&& __projected_comp = std::__make_projected(__comp, __proj);
  42
  43     auto __result = std::__is_heap_until(std::move(__first), std::move(__last_iter), __projected_comp);
  44     return __result == __last;
  45   }
  46
  47   template <random_access_iterator _Iter,
  48             sentinel_for<_Iter> _Sent,
  49             class _Proj                                               = identity,
  50             indirect_strict_weak_order<projected<_Iter, _Proj>> _Comp = ranges::less>
  51   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool
  52   operator()(_Iter __first, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
  53     return __is_heap_fn_impl(std::move(__first), std::move(__last), __comp, __proj);
  54   }
  55
  56   template <random_access_range _Range,
  57             class _Proj                                                            = identity,
  58             indirect_strict_weak_order<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
  59   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool
  60   operator()(_Range&& __range, _Comp __comp = {}, _Proj __proj = {}) const {
  61     return __is_heap_fn_impl(ranges::begin(__range), ranges::end(__range), __comp, __proj);
  62   }
  63 };
  64
  65 } // namespace __is_heap
  66
  67 inline namespace __cpo {
  68 inline constexpr auto is_heap = __is_heap::__fn{};
  69 } // namespace __cpo
  70 } // namespace ranges
  71
  72 _LIBCPP_END_NAMESPACE_STD
  73
  74 #endif // _LIBCPP_STD_VER >= 20
  75
  76 #endif // _LIBCPP___ALGORITHM_RANGES_IS_HEAP_H