v1/__algorithm/binary_search.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_BINARY_SEARCH_H
0010 #define _LIBCPP___ALGORITHM_BINARY_SEARCH_H
0011
0012 #include <__algorithm/comp.h>
0013 #include <__algorithm/comp_ref_type.h>
0014 #include <__algorithm/lower_bound.h>
0015 #include <__config>
0016
0017 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0018 #  pragma GCC system_header
0019 #endif
0020
0021 _LIBCPP_BEGIN_NAMESPACE_STD
0022
0023 template <class _ForwardIterator, class _Tp, class _Compare>
0024 [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
0025 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) {
0026   __first = std::lower_bound<_ForwardIterator, _Tp, __comp_ref_type<_Compare> >(__first, __last, __value, __comp);
0027   return __first != __last && !__comp(__value, *__first);
0028 }
0029
0030 template <class _ForwardIterator, class _Tp>
0031 [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
0032 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
0033   return std::binary_search(__first, __last, __value, __less<>());
0034 }
0035
0036 _LIBCPP_END_NAMESPACE_STD
0037
0038 #endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H