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1 | // HP/SGI iterator extensions -*- C++ -*- |
2 | ||
8d9254fc | 3 | // Copyright (C) 2001-2020 Free Software Foundation, Inc. |
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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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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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 | ||
748086b7 JJ |
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. | |
3d90ff93 | 19 | |
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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/>. | |
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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 | ||
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51 | /** @file ext/iterator |
52 | * This file is a GNU extension to the Standard C++ Library (possibly | |
0aa06b18 | 53 | * containing extensions from the HP/SGI STL subset). |
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54 | */ |
55 | ||
56 | #ifndef _EXT_ITERATOR | |
b2acb86f | 57 | #define _EXT_ITERATOR 1 |
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58 | |
59 | #pragma GCC system_header | |
b2acb86f | 60 | |
3d90ff93 | 61 | #include <bits/concept_check.h> |
54c1bf78 | 62 | #include <iterator> |
3d90ff93 | 63 | |
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64 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
65 | { | |
66 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
3cbc7af0 | 67 | |
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68 | // There are two signatures for distance. In addition to the one |
69 | // taking two iterators and returning a result, there is another | |
70 | // taking two iterators and a reference-to-result variable, and | |
fa30fe72 | 71 | // returning nothing. The latter seems to be an SGI extension. |
b2acb86f | 72 | // -- pedwards |
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73 | template<typename _InputIterator, typename _Distance> |
74 | inline void | |
75 | __distance(_InputIterator __first, _InputIterator __last, | |
6d66e50d | 76 | _Distance& __n, std::input_iterator_tag) |
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77 | { |
78 | // concept requirements | |
3d7c150e | 79 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
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80 | while (__first != __last) |
81 | { | |
82 | ++__first; | |
83 | ++__n; | |
84 | } | |
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85 | } |
86 | ||
87 | template<typename _RandomAccessIterator, typename _Distance> | |
88 | inline void | |
fa30fe72 | 89 | __distance(_RandomAccessIterator __first, _RandomAccessIterator __last, |
6d66e50d | 90 | _Distance& __n, std::random_access_iterator_tag) |
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91 | { |
92 | // concept requirements | |
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93 | __glibcxx_function_requires(_RandomAccessIteratorConcept< |
94 | _RandomAccessIterator>) | |
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95 | __n += __last - __first; |
96 | } | |
97 | ||
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98 | /** |
99 | * This is an SGI extension. | |
100 | * @ingroup SGIextensions | |
101 | * @doctodo | |
102 | */ | |
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103 | template<typename _InputIterator, typename _Distance> |
104 | inline void | |
105 | distance(_InputIterator __first, _InputIterator __last, | |
106 | _Distance& __n) | |
107 | { | |
108 | // concept requirements -- taken care of in __distance | |
6d66e50d | 109 | __distance(__first, __last, __n, std::__iterator_category(__first)); |
3d90ff93 | 110 | } |
3cbc7af0 | 111 | |
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112 | _GLIBCXX_END_NAMESPACE_VERSION |
113 | } // namespace | |
3d90ff93 | 114 | |
fa30fe72 | 115 | #endif |
3d90ff93 | 116 |