__cxx03/__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___CXX03___ALGORITHM_BINARY_SEARCH_H
0010 #define _LIBCPP___CXX03___ALGORITHM_BINARY_SEARCH_H
0011
0012 #include <__cxx03/__algorithm/comp.h>
0013 #include <__cxx03/__algorithm/comp_ref_type.h>
0014 #include <__cxx03/__algorithm/lower_bound.h>
0015 #include <__cxx03/__config>
0016 #include <__cxx03/__iterator/iterator_traits.h>
0017
0018 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0019 #  pragma GCC system_header
0020 #endif
0021
0022 _LIBCPP_BEGIN_NAMESPACE_STD
0023
0024 template <class _ForwardIterator, class _Tp, class _Compare>
0025 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
0026 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) {
0027   __first = std::lower_bound<_ForwardIterator, _Tp, __comp_ref_type<_Compare> >(__first, __last, __value, __comp);
0028   return __first != __last && !__comp(__value, *__first);
0029 }
0030
0031 template <class _ForwardIterator, class _Tp>
0032 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
0033 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
0034   return std::binary_search(__first, __last, __value, __less<>());
0035 }
0036
0037 _LIBCPP_END_NAMESPACE_STD
0038
0039 #endif // _LIBCPP___CXX03___ALGORITHM_BINARY_SEARCH_H