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 <__config>
13 #include <__algorithm/comp.h>
14 #include <__algorithm/lower_bound.h>
15 #include <__algorithm/comp_ref_type.h>
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_PUSH_MACROS
23 #include <__undef_macros>
24 
25 _LIBCPP_BEGIN_NAMESPACE_STD
26 
27 template <class _Compare, class _ForwardIterator, class _Tp>
28 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
29 bool
30 __binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
31 {
32     __first = _VSTD::__lower_bound<_Compare>(__first, __last, __value_, __comp);
33     return __first != __last && !__comp(__value_, *__first);
34 }
35 
36 template <class _ForwardIterator, class _Tp, class _Compare>
37 _LIBCPP_NODISCARD_EXT inline
38 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
39 bool
40 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
41 {
42     typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
43     return _VSTD::__binary_search<_Comp_ref>(__first, __last, __value_, __comp);
44 }
45 
46 template <class _ForwardIterator, class _Tp>
47 _LIBCPP_NODISCARD_EXT inline
48 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
49 bool
50 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_)
51 {
52     return _VSTD::binary_search(__first, __last, __value_,
53                              __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>());
54 }
55 
56 
57 _LIBCPP_END_NAMESPACE_STD
58 
59 _LIBCPP_POP_MACROS
60 
61 #endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H
62