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 # pragma clang include_instead(<algorithm>) 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _Compare, class _ForwardIterator, class _Tp> 26 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 27 bool 28 __binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp) 29 { 30 __first = _VSTD::__lower_bound<_Compare>(__first, __last, __value_, __comp); 31 return __first != __last && !__comp(__value_, *__first); 32 } 33 34 template <class _ForwardIterator, class _Tp, class _Compare> 35 _LIBCPP_NODISCARD_EXT inline 36 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 37 bool 38 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp) 39 { 40 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 41 return _VSTD::__binary_search<_Comp_ref>(__first, __last, __value_, __comp); 42 } 43 44 template <class _ForwardIterator, class _Tp> 45 _LIBCPP_NODISCARD_EXT inline 46 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 47 bool 48 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_) 49 { 50 return _VSTD::binary_search(__first, __last, __value_, 51 __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>()); 52 } 53 54 _LIBCPP_END_NAMESPACE_STD 55 56 #endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H 57