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