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 <__config> 13 #include <__algorithm/half_positive.h> 14 #include <iterator> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 #pragma GCC system_header 18 #endif 19 20 _LIBCPP_PUSH_MACROS 21 #include <__undef_macros> 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _Compare, class _ForwardIterator, class _Tp> 26 _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator 27 __upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp) 28 { 29 typedef typename iterator_traits<_ForwardIterator>::difference_type difference_type; 30 difference_type __len = _VSTD::distance(__first, __last); 31 while (__len != 0) 32 { 33 difference_type __l2 = _VSTD::__half_positive(__len); 34 _ForwardIterator __m = __first; 35 _VSTD::advance(__m, __l2); 36 if (__comp(__value_, *__m)) 37 __len = __l2; 38 else 39 { 40 __first = ++__m; 41 __len -= __l2 + 1; 42 } 43 } 44 return __first; 45 } 46 47 template <class _ForwardIterator, class _Tp, class _Compare> 48 _LIBCPP_NODISCARD_EXT inline 49 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 50 _ForwardIterator 51 upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp) 52 { 53 typedef typename add_lvalue_reference<_Compare>::type _Comp_ref; 54 return _VSTD::__upper_bound<_Comp_ref>(__first, __last, __value_, __comp); 55 } 56 57 template <class _ForwardIterator, class _Tp> 58 _LIBCPP_NODISCARD_EXT inline 59 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 60 _ForwardIterator 61 upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_) 62 { 63 return _VSTD::upper_bound(__first, __last, __value_, 64 __less<_Tp, typename iterator_traits<_ForwardIterator>::value_type>()); 65 } 66 67 _LIBCPP_END_NAMESPACE_STD 68 69 _LIBCPP_POP_MACROS 70 71 #endif // _LIBCPP___ALGORITHM_UPPER_BOUND_H 72