1 |
35 |
ultra_embe |
// Functions used by iterators -*- C++ -*-
|
2 |
|
|
|
3 |
|
|
// Copyright (C) 2001-2012 Free Software Foundation, Inc.
|
4 |
|
|
//
|
5 |
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
6 |
|
|
// software; you can redistribute it and/or modify it under the
|
7 |
|
|
// terms of the GNU General Public License as published by the
|
8 |
|
|
// Free Software Foundation; either version 3, or (at your option)
|
9 |
|
|
// any later version.
|
10 |
|
|
|
11 |
|
|
// This library is distributed in the hope that it will be useful,
|
12 |
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 |
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
14 |
|
|
// GNU General Public License for more details.
|
15 |
|
|
|
16 |
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
17 |
|
|
// permissions described in the GCC Runtime Library Exception, version
|
18 |
|
|
// 3.1, as published by the Free Software Foundation.
|
19 |
|
|
|
20 |
|
|
// You should have received a copy of the GNU General Public License and
|
21 |
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
22 |
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
23 |
|
|
// <http://www.gnu.org/licenses/>.
|
24 |
|
|
|
25 |
|
|
/*
|
26 |
|
|
*
|
27 |
|
|
* Copyright (c) 1994
|
28 |
|
|
* Hewlett-Packard Company
|
29 |
|
|
*
|
30 |
|
|
* Permission to use, copy, modify, distribute and sell this software
|
31 |
|
|
* and its documentation for any purpose is hereby granted without fee,
|
32 |
|
|
* provided that the above copyright notice appear in all copies and
|
33 |
|
|
* that both that copyright notice and this permission notice appear
|
34 |
|
|
* in supporting documentation. Hewlett-Packard Company makes no
|
35 |
|
|
* representations about the suitability of this software for any
|
36 |
|
|
* purpose. It is provided "as is" without express or implied warranty.
|
37 |
|
|
*
|
38 |
|
|
*
|
39 |
|
|
* Copyright (c) 1996-1998
|
40 |
|
|
* Silicon Graphics Computer Systems, Inc.
|
41 |
|
|
*
|
42 |
|
|
* Permission to use, copy, modify, distribute and sell this software
|
43 |
|
|
* and its documentation for any purpose is hereby granted without fee,
|
44 |
|
|
* provided that the above copyright notice appear in all copies and
|
45 |
|
|
* that both that copyright notice and this permission notice appear
|
46 |
|
|
* in supporting documentation. Silicon Graphics makes no
|
47 |
|
|
* representations about the suitability of this software for any
|
48 |
|
|
* purpose. It is provided "as is" without express or implied warranty.
|
49 |
|
|
*/
|
50 |
|
|
|
51 |
|
|
/** @file bits/stl_iterator_base_funcs.h
|
52 |
|
|
* This is an internal header file, included by other library headers.
|
53 |
|
|
* Do not attempt to use it directly. @headername{iterator}
|
54 |
|
|
*
|
55 |
|
|
* This file contains all of the general iterator-related utility
|
56 |
|
|
* functions, such as distance() and advance().
|
57 |
|
|
*/
|
58 |
|
|
|
59 |
|
|
#ifndef _STL_ITERATOR_BASE_FUNCS_H
|
60 |
|
|
#define _STL_ITERATOR_BASE_FUNCS_H 1
|
61 |
|
|
|
62 |
|
|
#pragma GCC system_header
|
63 |
|
|
|
64 |
|
|
#include <bits/concept_check.h>
|
65 |
|
|
#include <debug/debug.h>
|
66 |
|
|
|
67 |
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
68 |
|
|
{
|
69 |
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
70 |
|
|
|
71 |
|
|
template<typename _InputIterator>
|
72 |
|
|
inline typename iterator_traits<_InputIterator>::difference_type
|
73 |
|
|
__distance(_InputIterator __first, _InputIterator __last,
|
74 |
|
|
input_iterator_tag)
|
75 |
|
|
{
|
76 |
|
|
// concept requirements
|
77 |
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
|
78 |
|
|
|
79 |
|
|
typename iterator_traits<_InputIterator>::difference_type __n = 0;
|
80 |
|
|
while (__first != __last)
|
81 |
|
|
{
|
82 |
|
|
++__first;
|
83 |
|
|
++__n;
|
84 |
|
|
}
|
85 |
|
|
return __n;
|
86 |
|
|
}
|
87 |
|
|
|
88 |
|
|
template<typename _RandomAccessIterator>
|
89 |
|
|
inline typename iterator_traits<_RandomAccessIterator>::difference_type
|
90 |
|
|
__distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
91 |
|
|
random_access_iterator_tag)
|
92 |
|
|
{
|
93 |
|
|
// concept requirements
|
94 |
|
|
__glibcxx_function_requires(_RandomAccessIteratorConcept<
|
95 |
|
|
_RandomAccessIterator>)
|
96 |
|
|
return __last - __first;
|
97 |
|
|
}
|
98 |
|
|
|
99 |
|
|
/**
|
100 |
|
|
* @brief A generalization of pointer arithmetic.
|
101 |
|
|
* @param __first An input iterator.
|
102 |
|
|
* @param __last An input iterator.
|
103 |
|
|
* @return The distance between them.
|
104 |
|
|
*
|
105 |
|
|
* Returns @c n such that __first + n == __last. This requires
|
106 |
|
|
* that @p __last must be reachable from @p __first. Note that @c
|
107 |
|
|
* n may be negative.
|
108 |
|
|
*
|
109 |
|
|
* For random access iterators, this uses their @c + and @c - operations
|
110 |
|
|
* and are constant time. For other %iterator classes they are linear time.
|
111 |
|
|
*/
|
112 |
|
|
template<typename _InputIterator>
|
113 |
|
|
inline typename iterator_traits<_InputIterator>::difference_type
|
114 |
|
|
distance(_InputIterator __first, _InputIterator __last)
|
115 |
|
|
{
|
116 |
|
|
// concept requirements -- taken care of in __distance
|
117 |
|
|
return std::__distance(__first, __last,
|
118 |
|
|
std::__iterator_category(__first));
|
119 |
|
|
}
|
120 |
|
|
|
121 |
|
|
template<typename _InputIterator, typename _Distance>
|
122 |
|
|
inline void
|
123 |
|
|
__advance(_InputIterator& __i, _Distance __n, input_iterator_tag)
|
124 |
|
|
{
|
125 |
|
|
// concept requirements
|
126 |
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
|
127 |
|
|
_GLIBCXX_DEBUG_ASSERT(__n >= 0);
|
128 |
|
|
while (__n--)
|
129 |
|
|
++__i;
|
130 |
|
|
}
|
131 |
|
|
|
132 |
|
|
template<typename _BidirectionalIterator, typename _Distance>
|
133 |
|
|
inline void
|
134 |
|
|
__advance(_BidirectionalIterator& __i, _Distance __n,
|
135 |
|
|
bidirectional_iterator_tag)
|
136 |
|
|
{
|
137 |
|
|
// concept requirements
|
138 |
|
|
__glibcxx_function_requires(_BidirectionalIteratorConcept<
|
139 |
|
|
_BidirectionalIterator>)
|
140 |
|
|
if (__n > 0)
|
141 |
|
|
while (__n--)
|
142 |
|
|
++__i;
|
143 |
|
|
else
|
144 |
|
|
while (__n++)
|
145 |
|
|
--__i;
|
146 |
|
|
}
|
147 |
|
|
|
148 |
|
|
template<typename _RandomAccessIterator, typename _Distance>
|
149 |
|
|
inline void
|
150 |
|
|
__advance(_RandomAccessIterator& __i, _Distance __n,
|
151 |
|
|
random_access_iterator_tag)
|
152 |
|
|
{
|
153 |
|
|
// concept requirements
|
154 |
|
|
__glibcxx_function_requires(_RandomAccessIteratorConcept<
|
155 |
|
|
_RandomAccessIterator>)
|
156 |
|
|
__i += __n;
|
157 |
|
|
}
|
158 |
|
|
|
159 |
|
|
/**
|
160 |
|
|
* @brief A generalization of pointer arithmetic.
|
161 |
|
|
* @param __i An input iterator.
|
162 |
|
|
* @param __n The @a delta by which to change @p __i.
|
163 |
|
|
* @return Nothing.
|
164 |
|
|
*
|
165 |
|
|
* This increments @p i by @p n. For bidirectional and random access
|
166 |
|
|
* iterators, @p __n may be negative, in which case @p __i is decremented.
|
167 |
|
|
*
|
168 |
|
|
* For random access iterators, this uses their @c + and @c - operations
|
169 |
|
|
* and are constant time. For other %iterator classes they are linear time.
|
170 |
|
|
*/
|
171 |
|
|
template<typename _InputIterator, typename _Distance>
|
172 |
|
|
inline void
|
173 |
|
|
advance(_InputIterator& __i, _Distance __n)
|
174 |
|
|
{
|
175 |
|
|
// concept requirements -- taken care of in __advance
|
176 |
|
|
typename iterator_traits<_InputIterator>::difference_type __d = __n;
|
177 |
|
|
std::__advance(__i, __d, std::__iterator_category(__i));
|
178 |
|
|
}
|
179 |
|
|
|
180 |
|
|
#if __cplusplus >= 201103L
|
181 |
|
|
|
182 |
|
|
template<typename _ForwardIterator>
|
183 |
|
|
inline _ForwardIterator
|
184 |
|
|
next(_ForwardIterator __x, typename
|
185 |
|
|
iterator_traits<_ForwardIterator>::difference_type __n = 1)
|
186 |
|
|
{
|
187 |
|
|
std::advance(__x, __n);
|
188 |
|
|
return __x;
|
189 |
|
|
}
|
190 |
|
|
|
191 |
|
|
template<typename _BidirectionalIterator>
|
192 |
|
|
inline _BidirectionalIterator
|
193 |
|
|
prev(_BidirectionalIterator __x, typename
|
194 |
|
|
iterator_traits<_BidirectionalIterator>::difference_type __n = 1)
|
195 |
|
|
{
|
196 |
|
|
std::advance(__x, -__n);
|
197 |
|
|
return __x;
|
198 |
|
|
}
|
199 |
|
|
|
200 |
|
|
#endif // C++11
|
201 |
|
|
|
202 |
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
203 |
|
|
} // namespace
|
204 |
|
|
|
205 |
|
|
#endif /* _STL_ITERATOR_BASE_FUNCS_H */
|