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comparison libcxx/include/__algorithm/lower_bound.h @ 221:79ff65ed7e25

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LLVM12 Original
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Tue, 15 Jun 2021 19:15:29 +0900
parents
children 5f17cb93ff66
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220:42394fc6a535 221:79ff65ed7e25
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_LOWER_BOUND_H
10 #define _LIBCPP___ALGORITHM_LOWER_BOUND_H
11
12 #include <__config>
13 #include <__algorithm/half_positive.h>
14 #include <__algorithm/comp.h>
15 #include <iterator>
16
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #pragma GCC system_header
19 #endif
20
21 _LIBCPP_PUSH_MACROS
22 #include <__undef_macros>
23
24 _LIBCPP_BEGIN_NAMESPACE_STD
25
26 template <class _Compare, class _ForwardIterator, class _Tp>
27 _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
28 __lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
29 {
30 typedef typename iterator_traits<_ForwardIterator>::difference_type difference_type;
31 difference_type __len = _VSTD::distance(__first, __last);
32 while (__len != 0)
33 {
34 difference_type __l2 = _VSTD::__half_positive(__len);
35 _ForwardIterator __m = __first;
36 _VSTD::advance(__m, __l2);
37 if (__comp(*__m, __value_))
38 {
39 __first = ++__m;
40 __len -= __l2 + 1;
41 }
42 else
43 __len = __l2;
44 }
45 return __first;
46 }
47
48 template <class _ForwardIterator, class _Tp, class _Compare>
49 _LIBCPP_NODISCARD_EXT inline
50 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
51 _ForwardIterator
52 lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
53 {
54 typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
55 return _VSTD::__lower_bound<_Comp_ref>(__first, __last, __value_, __comp);
56 }
57
58 template <class _ForwardIterator, class _Tp>
59 _LIBCPP_NODISCARD_EXT inline
60 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
61 _ForwardIterator
62 lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_)
63 {
64 return _VSTD::lower_bound(__first, __last, __value_,
65 __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>());
66 }
67
68 _LIBCPP_END_NAMESPACE_STD
69
70 _LIBCPP_POP_MACROS
71
72 #endif // _LIBCPP___ALGORITHM_LOWER_BOUND_H