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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___ALGORITHM_UPPER_BOUND_H10#define _LIBCPP___ALGORITHM_UPPER_BOUND_H11 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/invoke.h>22#include <__type_traits/is_callable.h>23#include <__type_traits/is_constructible.h>24#include <__utility/move.h>25 26#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)27# pragma GCC system_header28#endif29 30_LIBCPP_PUSH_MACROS31#include <__undef_macros>32 33_LIBCPP_BEGIN_NAMESPACE_STD34 35template <class _AlgPolicy, class _Compare, class _Iter, class _Sent, class _Tp, class _Proj>36_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Iter37__upper_bound(_Iter __first, _Sent __last, const _Tp& __value, _Compare&& __comp, _Proj&& __proj) {38 auto __len = _IterOps<_AlgPolicy>::distance(__first, __last);39 while (__len != 0) {40 auto __half_len = std::__half_positive(__len);41 auto __mid = _IterOps<_AlgPolicy>::next(__first, __half_len);42 if (std::__invoke(__comp, __value, std::__invoke(__proj, *__mid)))43 __len = __half_len;44 else {45 __first = ++__mid;46 __len -= __half_len + 1;47 }48 }49 return __first;50}51 52template <class _ForwardIterator, class _Tp, class _Compare>53[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator54upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) {55 static_assert(__is_callable<_Compare&, const _Tp&, decltype(*__first)>::value, "The comparator has to be callable");56 static_assert(is_copy_constructible<_ForwardIterator>::value, "Iterator has to be copy constructible");57 return std::__upper_bound<_ClassicAlgPolicy>(58 std::move(__first), std::move(__last), __value, std::move(__comp), std::__identity());59}60 61template <class _ForwardIterator, class _Tp>62[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator63upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {64 return std::upper_bound(std::move(__first), std::move(__last), __value, __less<>());65}66 67_LIBCPP_END_NAMESPACE_STD68 69_LIBCPP_POP_MACROS70 71#endif // _LIBCPP___ALGORITHM_UPPER_BOUND_H72