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_UPPER_BOUND_H 10 #define _LIBCPP___ALGORITHM_UPPER_BOUND_H 11 12 #include <__algorithm/comp.h> 13 #include <__algorithm/half_positive.h> 14 #include <__algorithm/iterator_operations.h> 15 #include <__config> 16 #include <__functional/identity.h> 17 #include <__functional/invoke.h> 18 #include <__iterator/advance.h> 19 #include <__iterator/distance.h> 20 #include <__iterator/iterator_traits.h> 21 #include <__type_traits/is_copy_constructible.h> 22 #include <__utility/move.h> 23 24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25 # pragma GCC system_header 26 #endif 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 template <class _AlgPolicy, class _Compare, class _Iter, class _Sent, class _Tp, class _Proj> 31 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Iter 32 __upper_bound(_Iter __first, _Sent __last, const _Tp& __value, _Compare&& __comp, _Proj&& __proj) { 33 auto __len = _IterOps<_AlgPolicy>::distance(__first, __last); 34 while (__len != 0) { 35 auto __half_len = std::__half_positive(__len); 36 auto __mid = _IterOps<_AlgPolicy>::next(__first, __half_len); 37 if (std::__invoke(__comp, __value, std::__invoke(__proj, *__mid))) 38 __len = __half_len; 39 else { 40 __first = ++__mid; 41 __len -= __half_len + 1; 42 } 43 } 44 return __first; 45 } 46 47 template <class _ForwardIterator, class _Tp, class _Compare> 48 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 49 upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) { 50 static_assert(is_copy_constructible<_ForwardIterator>::value, 51 "Iterator has to be copy constructible"); 52 return std::__upper_bound<_ClassicAlgPolicy>( 53 std::move(__first), std::move(__last), __value, std::move(__comp), std::__identity()); 54 } 55 56 template <class _ForwardIterator, class _Tp> 57 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 58 upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) { 59 return std::upper_bound( 60 std::move(__first), 61 std::move(__last), 62 __value, 63 __less<_Tp, typename iterator_traits<_ForwardIterator>::value_type>()); 64 } 65 66 _LIBCPP_END_NAMESPACE_STD 67 68 #endif // _LIBCPP___ALGORITHM_UPPER_BOUND_H 69