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Diffstat (limited to 'libcxx/include/__algorithm/binary_search.h')
-rw-r--r-- | libcxx/include/__algorithm/binary_search.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/libcxx/include/__algorithm/binary_search.h b/libcxx/include/__algorithm/binary_search.h new file mode 100644 index 000000000000..766f5da16296 --- /dev/null +++ b/libcxx/include/__algorithm/binary_search.h @@ -0,0 +1,61 @@ +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef _LIBCPP___ALGORITHM_BINARY_SEARCH_H +#define _LIBCPP___ALGORITHM_BINARY_SEARCH_H + +#include <__config> +#include <__algorithm/comp.h> +#include <__algorithm/lower_bound.h> +#include <__algorithm/comp_ref_type.h> +#include <__iterator/iterator_traits.h> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +_LIBCPP_PUSH_MACROS +#include <__undef_macros> + +_LIBCPP_BEGIN_NAMESPACE_STD + +template <class _Compare, class _ForwardIterator, class _Tp> +inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 +bool +__binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp) +{ + __first = _VSTD::__lower_bound<_Compare>(__first, __last, __value_, __comp); + return __first != __last && !__comp(__value_, *__first); +} + +template <class _ForwardIterator, class _Tp, class _Compare> +_LIBCPP_NODISCARD_EXT inline +_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 +bool +binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp) +{ + typedef typename __comp_ref_type<_Compare>::type _Comp_ref; + return _VSTD::__binary_search<_Comp_ref>(__first, __last, __value_, __comp); +} + +template <class _ForwardIterator, class _Tp> +_LIBCPP_NODISCARD_EXT inline +_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 +bool +binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_) +{ + return _VSTD::binary_search(__first, __last, __value_, + __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>()); +} + + +_LIBCPP_END_NAMESPACE_STD + +_LIBCPP_POP_MACROS + +#endif // _LIBCPP___ALGORITHM_BINARY_SEARCH_H |