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 <__config> 13 #include <__algorithm/comp.h> 14 #include <__algorithm/lower_bound.h> 15 #include <__algorithm/comp_ref_type.h> 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_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 template <class _Compare, class _ForwardIterator, class _Tp> 28 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 29 bool 30 __binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp) 31 { 32 __first = _VSTD::__lower_bound<_Compare>(__first, __last, __value_, __comp); 33 return __first != __last && !__comp(__value_, *__first); 34 } 35 36 template <class _ForwardIterator, class _Tp, class _Compare> 37 _LIBCPP_NODISCARD_EXT inline 38 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 39 bool 40 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp) 41 { 42 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 43 return _VSTD::__binary_search<_Comp_ref>(__first, __last, __value_, __comp); 44 } 45 46 template <class _ForwardIterator, class _Tp> 47 _LIBCPP_NODISCARD_EXT inline 48 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 49 bool 50 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_) 51 { 52 return _VSTD::binary_search(__first, __last, __value_, 53 __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>()); 54 } 55 56 57 _LIBCPP_END_NAMESPACE_STD 58 59 _LIBCPP_POP_MACROS 60 61 #endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H 62