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_BINARY_SEARCH_H
10#define _LIBCPP___ALGORITHM_BINARY_SEARCH_H
11
12#include <__algorithm/comp.h>
13#include <__algorithm/comp_ref_type.h>
14#include <__algorithm/lower_bound.h>
15#include <__config>
16#include <__iterator/iterator_traits.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19#  pragma GCC system_header
20#endif
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23
24template <class _ForwardIterator, class _Tp, class _Compare>
25_LIBCPP_NODISCARD_EXT inline
26_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
27bool
28binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp)
29{
30    __first = std::lower_bound<_ForwardIterator, _Tp, __comp_ref_type<_Compare> >(__first, __last, __value, __comp);
31    return __first != __last && !__comp(__value, *__first);
32}
33
34template <class _ForwardIterator, class _Tp>
35_LIBCPP_NODISCARD_EXT inline
36_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
37bool
38binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
39{
40    return std::binary_search(__first, __last, __value,
41                              __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>());
42}
43
44_LIBCPP_END_NAMESPACE_STD
45
46#endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H
47