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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___CXX03___ALGORITHM_EQUAL_RANGE_H
10#define _LIBCPP___CXX03___ALGORITHM_EQUAL_RANGE_H
11
12#include <__cxx03/__algorithm/comp.h>
13#include <__cxx03/__algorithm/comp_ref_type.h>
14#include <__cxx03/__algorithm/half_positive.h>
15#include <__cxx03/__algorithm/iterator_operations.h>
16#include <__cxx03/__algorithm/lower_bound.h>
17#include <__cxx03/__algorithm/upper_bound.h>
18#include <__cxx03/__config>
19#include <__cxx03/__functional/identity.h>
20#include <__cxx03/__iterator/advance.h>
21#include <__cxx03/__iterator/distance.h>
22#include <__cxx03/__iterator/iterator_traits.h>
23#include <__cxx03/__iterator/next.h>
24#include <__cxx03/__type_traits/invoke.h>
25#include <__cxx03/__type_traits/is_callable.h>
26#include <__cxx03/__type_traits/is_constructible.h>
27#include <__cxx03/__utility/move.h>
28#include <__cxx03/__utility/pair.h>
29
30#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
31# pragma GCC system_header
32#endif
33
34_LIBCPP_PUSH_MACROS
35#include <__cxx03/__undef_macros>
36
37_LIBCPP_BEGIN_NAMESPACE_STD
38
39template <class _AlgPolicy, class _Compare, class _Iter, class _Sent, class _Tp, class _Proj>
40_LIBCPP_HIDE_FROM_ABI pair<_Iter, _Iter>
41__equal_range(_Iter __first, _Sent __last, const _Tp& __value, _Compare&& __comp, _Proj&& __proj) {
42 auto __len = _IterOps<_AlgPolicy>::distance(__first, __last);
43 _Iter __end = _IterOps<_AlgPolicy>::next(__first, __last);
44 while (__len != 0) {
45 auto __half_len = std::__half_positive(__len);
46 _Iter __mid = _IterOps<_AlgPolicy>::next(__first, __half_len);
47 if (std::__invoke(__comp, std::__invoke(__proj, *__mid), __value)) {
48 __first = ++__mid;
49 __len -= __half_len + 1;
50 } else if (std::__invoke(__comp, __value, std::__invoke(__proj, *__mid))) {
51 __end = __mid;
52 __len = __half_len;
53 } else {
54 _Iter __mp1 = __mid;
55 return pair<_Iter, _Iter>(std::__lower_bound<_AlgPolicy>(__first, __mid, __value, __comp, __proj),
56 std::__upper_bound<_AlgPolicy>(++__mp1, __end, __value, __comp, __proj));
57 }
58 }
59 return pair<_Iter, _Iter>(__first, __first);
60}
61
62template <class _ForwardIterator, class _Tp, class _Compare>
63_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI pair<_ForwardIterator, _ForwardIterator>
64equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) {
65 static_assert(__is_callable<_Compare, decltype(*__first), const _Tp&>::value, "The comparator has to be callable");
66 static_assert(is_copy_constructible<_ForwardIterator>::value, "Iterator has to be copy constructible");
67 return std::__equal_range<_ClassicAlgPolicy>(
68 std::move(__first),
69 std::move(__last),
70 __value,
71 static_cast<__comp_ref_type<_Compare> >(__comp),
72 std::__identity());
73}
74
75template <class _ForwardIterator, class _Tp>
76_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI pair<_ForwardIterator, _ForwardIterator>
77equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
78 return std::equal_range(std::move(__first), std::move(__last), __value, __less<>());
79}
80
81_LIBCPP_END_NAMESPACE_STD
82
83_LIBCPP_POP_MACROS
84
85#endif // _LIBCPP___CXX03___ALGORITHM_EQUAL_RANGE_H
86

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source code of libcxx/include/__cxx03/__algorithm/equal_range.h