1 //===----------------------------------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef _LIBCPP___ALGORITHM_BINARY_SEARCH_H
10 #define _LIBCPP___ALGORITHM_BINARY_SEARCH_H
12 #include <__algorithm/comp.h>
13 #include <__algorithm/comp_ref_type.h>
14 #include <__algorithm/lower_bound.h>
16 #include <__iterator/iterator_traits.h>
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 # pragma GCC system_header
22 _LIBCPP_BEGIN_NAMESPACE_STD
24 template <class _ForwardIterator, class _Tp, class _Compare>
25 _LIBCPP_NODISCARD_EXT inline
26 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
28 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp)
30 using _Comp_ref = typename __comp_ref_type<_Compare>::type;
31 __first = std::lower_bound<_ForwardIterator, _Tp, _Comp_ref>(__first, __last, __value, __comp);
32 return __first != __last && !__comp(__value, *__first);
35 template <class _ForwardIterator, class _Tp>
36 _LIBCPP_NODISCARD_EXT inline
37 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
39 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
41 return std::binary_search(__first, __last, __value,
42 __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>());
45 _LIBCPP_END_NAMESPACE_STD
47 #endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H