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_SORT_HEAP_H
10 #define _LIBCPP___ALGORITHM_SORT_HEAP_H
11 
12 #include <__algorithm/comp.h>
13 #include <__algorithm/comp_ref_type.h>
14 #include <__algorithm/iterator_operations.h>
15 #include <__algorithm/pop_heap.h>
16 #include <__config>
17 #include <__iterator/iterator_traits.h>
18 #include <__utility/move.h>
19 #include <type_traits>
20 
21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22 #  pragma GCC system_header
23 #endif
24 
25 _LIBCPP_BEGIN_NAMESPACE_STD
26 
27 template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>
28 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
29 void __sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare&& __comp) {
30   using _CompRef = typename __comp_ref_type<_Compare>::type;
31   _CompRef __comp_ref = __comp;
32 
33   using difference_type = typename iterator_traits<_RandomAccessIterator>::difference_type;
34   for (difference_type __n = __last - __first; __n > 1; --__last, (void) --__n)
35     std::__pop_heap<_AlgPolicy>(__first, __last, __comp_ref, __n);
36 }
37 
38 template <class _RandomAccessIterator, class _Compare>
39 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
40 void sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) {
41   static_assert(std::is_copy_constructible<_RandomAccessIterator>::value, "Iterators must be copy constructible.");
42   static_assert(std::is_copy_assignable<_RandomAccessIterator>::value, "Iterators must be copy assignable.");
43 
44   std::__sort_heap<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp);
45 }
46 
47 template <class _RandomAccessIterator>
48 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
49 void sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) {
50   std::sort_heap(std::move(__first), std::move(__last),
51       __less<typename iterator_traits<_RandomAccessIterator>::value_type>());
52 }
53 
54 _LIBCPP_END_NAMESPACE_STD
55 
56 #endif // _LIBCPP___ALGORITHM_SORT_HEAP_H
57