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0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008 
0009 #ifndef _LIBCPP___CXX03___ALGORITHM_RANGES_POP_HEAP_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_POP_HEAP_H
0011 
0012 #include <__cxx03/__algorithm/iterator_operations.h>
0013 #include <__cxx03/__algorithm/make_projected.h>
0014 #include <__cxx03/__algorithm/pop_heap.h>
0015 #include <__cxx03/__concepts/same_as.h>
0016 #include <__cxx03/__config>
0017 #include <__cxx03/__functional/identity.h>
0018 #include <__cxx03/__functional/invoke.h>
0019 #include <__cxx03/__functional/ranges_operations.h>
0020 #include <__cxx03/__iterator/concepts.h>
0021 #include <__cxx03/__iterator/iterator_traits.h>
0022 #include <__cxx03/__iterator/next.h>
0023 #include <__cxx03/__iterator/projected.h>
0024 #include <__cxx03/__iterator/sortable.h>
0025 #include <__cxx03/__ranges/access.h>
0026 #include <__cxx03/__ranges/concepts.h>
0027 #include <__cxx03/__ranges/dangling.h>
0028 #include <__cxx03/__utility/forward.h>
0029 #include <__cxx03/__utility/move.h>
0030 
0031 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0032 #  pragma GCC system_header
0033 #endif
0034 
0035 _LIBCPP_PUSH_MACROS
0036 #include <__cxx03/__undef_macros>
0037 
0038 #if _LIBCPP_STD_VER >= 20
0039 
0040 _LIBCPP_BEGIN_NAMESPACE_STD
0041 
0042 namespace ranges {
0043 namespace __pop_heap {
0044 
0045 struct __fn {
0046   template <class _Iter, class _Sent, class _Comp, class _Proj>
0047   _LIBCPP_HIDE_FROM_ABI constexpr static _Iter
0048   __pop_heap_fn_impl(_Iter __first, _Sent __last, _Comp& __comp, _Proj& __proj) {
0049     auto __last_iter = ranges::next(__first, __last);
0050     auto __len       = __last_iter - __first;
0051 
0052     auto&& __projected_comp = std::__make_projected(__comp, __proj);
0053     std::__pop_heap<_RangeAlgPolicy>(std::move(__first), __last_iter, __projected_comp, __len);
0054 
0055     return __last_iter;
0056   }
0057 
0058   template <random_access_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity>
0059     requires sortable<_Iter, _Comp, _Proj>
0060   _LIBCPP_HIDE_FROM_ABI constexpr _Iter
0061   operator()(_Iter __first, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
0062     return __pop_heap_fn_impl(std::move(__first), std::move(__last), __comp, __proj);
0063   }
0064 
0065   template <random_access_range _Range, class _Comp = ranges::less, class _Proj = identity>
0066     requires sortable<iterator_t<_Range>, _Comp, _Proj>
0067   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range>
0068   operator()(_Range&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
0069     return __pop_heap_fn_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
0070   }
0071 };
0072 
0073 } // namespace __pop_heap
0074 
0075 inline namespace __cpo {
0076 inline constexpr auto pop_heap = __pop_heap::__fn{};
0077 } // namespace __cpo
0078 } // namespace ranges
0079 
0080 _LIBCPP_END_NAMESPACE_STD
0081 
0082 #endif // _LIBCPP_STD_VER >= 20
0083 
0084 _LIBCPP_POP_MACROS
0085 
0086 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_POP_HEAP_H