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 
24 template <class _Compare, class _ForwardIterator, class _Tp>
25 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
26 bool
27 __binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
28 {
29     __first = _VSTD::__lower_bound<_Compare>(__first, __last, __value_, __comp);
30     return __first != __last && !__comp(__value_, *__first);
31 }
32 
33 template <class _ForwardIterator, class _Tp, class _Compare>
34 _LIBCPP_NODISCARD_EXT inline
35 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
36 bool
37 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
38 {
39     typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
40     return _VSTD::__binary_search<_Comp_ref>(__first, __last, __value_, __comp);
41 }
42 
43 template <class _ForwardIterator, class _Tp>
44 _LIBCPP_NODISCARD_EXT inline
45 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
46 bool
47 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_)
48 {
49     return _VSTD::binary_search(__first, __last, __value_,
50                              __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>());
51 }
52 
53 _LIBCPP_END_NAMESPACE_STD
54 
55 #endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H
56