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1 | // HP/SGI iterator extensions -*- C++ -*- |
2 | ||
ffe94f83 | 3 | // Copyright (C) 2001, 2002 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 | |
8 | // Free Software Foundation; either version 2, 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 | // You should have received a copy of the GNU General Public License along | |
17 | // with this library; see the file COPYING. If not, write to the Free | |
18 | // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
19 | // USA. | |
20 | ||
21 | // As a special exception, you may use this file as part of a free software | |
22 | // library without restriction. Specifically, if other files instantiate | |
23 | // templates or use macros or inline functions from this file, or you compile | |
24 | // this file and link it with other files to produce an executable, this | |
25 | // file does not by itself cause the resulting executable to be covered by | |
26 | // the GNU General Public License. This exception does not however | |
27 | // invalidate any other reasons why the executable file might be covered by | |
28 | // the GNU General Public License. | |
29 | ||
30 | /* | |
31 | * | |
32 | * Copyright (c) 1994 | |
33 | * Hewlett-Packard Company | |
34 | * | |
35 | * Permission to use, copy, modify, distribute and sell this software | |
36 | * and its documentation for any purpose is hereby granted without fee, | |
37 | * provided that the above copyright notice appear in all copies and | |
38 | * that both that copyright notice and this permission notice appear | |
39 | * in supporting documentation. Hewlett-Packard Company makes no | |
40 | * representations about the suitability of this software for any | |
41 | * purpose. It is provided "as is" without express or implied warranty. | |
42 | * | |
43 | * | |
44 | * Copyright (c) 1996-1998 | |
45 | * Silicon Graphics Computer Systems, Inc. | |
46 | * | |
47 | * Permission to use, copy, modify, distribute and sell this software | |
48 | * and its documentation for any purpose is hereby granted without fee, | |
49 | * provided that the above copyright notice appear in all copies and | |
50 | * that both that copyright notice and this permission notice appear | |
51 | * in supporting documentation. Silicon Graphics makes no | |
52 | * representations about the suitability of this software for any | |
53 | * purpose. It is provided "as is" without express or implied warranty. | |
54 | */ | |
55 | ||
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56 | /** @file ext/iterator |
57 | * This file is a GNU extension to the Standard C++ Library (possibly | |
58 | * containing extensions from the HP/SGI STL subset). You should only | |
59 | * include this header if you are using GCC 3 or later. | |
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60 | */ |
61 | ||
62 | #ifndef _EXT_ITERATOR | |
b2acb86f | 63 | #define _EXT_ITERATOR 1 |
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64 | |
65 | #pragma GCC system_header | |
b2acb86f | 66 | |
3d90ff93 | 67 | #include <bits/concept_check.h> |
54c1bf78 | 68 | #include <iterator> |
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69 | |
70 | namespace __gnu_cxx | |
71 | { | |
b2acb86f BK |
72 | // There are two signatures for distance. In addition to the one |
73 | // taking two iterators and returning a result, there is another | |
74 | // taking two iterators and a reference-to-result variable, and | |
75 | // returning nothing. The latter seems to be an SGI extension. | |
76 | // -- pedwards | |
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77 | template<typename _InputIterator, typename _Distance> |
78 | inline void | |
79 | __distance(_InputIterator __first, _InputIterator __last, | |
6d66e50d | 80 | _Distance& __n, std::input_iterator_tag) |
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81 | { |
82 | // concept requirements | |
3d7c150e | 83 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
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84 | while (__first != __last) { ++__first; ++__n; } |
85 | } | |
86 | ||
87 | template<typename _RandomAccessIterator, typename _Distance> | |
88 | inline void | |
89 | __distance(_RandomAccessIterator __first, _RandomAccessIterator __last, | |
6d66e50d | 90 | _Distance& __n, std::random_access_iterator_tag) |
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91 | { |
92 | // concept requirements | |
3d7c150e | 93 | __glibcxx_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>) |
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94 | __n += __last - __first; |
95 | } | |
96 | ||
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97 | /** |
98 | * This is an SGI extension. | |
99 | * @ingroup SGIextensions | |
100 | * @doctodo | |
101 | */ | |
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102 | template<typename _InputIterator, typename _Distance> |
103 | inline void | |
104 | distance(_InputIterator __first, _InputIterator __last, | |
105 | _Distance& __n) | |
106 | { | |
107 | // concept requirements -- taken care of in __distance | |
6d66e50d | 108 | __distance(__first, __last, __n, std::__iterator_category(__first)); |
3d90ff93 | 109 | } |
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110 | } // namespace __gnu_cxx |
111 | ||
b2acb86f | 112 | #endif |
3d90ff93 | 113 |