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4680 | right-hear | 1 | // The template and inlines for the -*- C++ -*- gslice class. |
2 | |||
3 | // Copyright (C) 1997-2001 Free Software Foundation, Inc. |
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4 | // |
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5 | // This file is part of the GNU ISO C++ Library. This library is free |
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6 | // software; you can redistribute it and/or modify it under the |
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7 | // terms of the GNU General Public License as published by the |
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8 | // Free Software Foundation; either version 2, or (at your option) |
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9 | // any later version. |
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10 | |||
11 | // This library is distributed in the hope that it will be useful, |
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12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | // GNU General Public License for more details. |
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15 | |||
16 | // You should have received a copy of the GNU General Public License along |
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17 | // with this library; see the file COPYING. If not, write to the Free |
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18 | // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
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19 | // USA. |
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20 | |||
21 | // As a special exception, you may use this file as part of a free software |
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22 | // library without restriction. Specifically, if other files instantiate |
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23 | // templates or use macros or inline functions from this file, or you compile |
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24 | // this file and link it with other files to produce an executable, this |
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25 | // file does not by itself cause the resulting executable to be covered by |
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26 | // the GNU General Public License. This exception does not however |
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27 | // invalidate any other reasons why the executable file might be covered by |
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28 | // the GNU General Public License. |
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29 | |||
30 | // Written by Gabriel Dos Reis |
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31 | |||
32 | #ifndef _CPP_BITS_GSLICE_H |
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33 | #define _CPP_BITS_GSLICE_H 1 |
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34 | |||
35 | #pragma GCC system_header |
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36 | |||
37 | namespace std { |
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38 | |||
39 | class gslice |
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40 | { |
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41 | public: |
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42 | gslice (); |
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43 | gslice (size_t, const valarray |
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44 | // XXX: the IS says the copy-ctor and copy-assignment operators are |
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45 | // synthetized by the compiler but they are just unsuitable |
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46 | // for a ref-counted semantic |
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47 | gslice(const gslice&); |
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48 | ~gslice(); |
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49 | |||
50 | // XXX: See the note above. |
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51 | gslice& operator= (const gslice&); |
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52 | |||
53 | size_t start () const; |
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54 | valarray |
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55 | valarray |
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56 | |||
57 | private: |
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58 | struct _Indexer { |
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59 | size_t _M_count; |
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60 | size_t _M_start; |
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61 | valarray |
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62 | valarray |
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63 | valarray |
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64 | _Indexer(size_t, const valarray |
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65 | const valarray |
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66 | void _M_increment_use() { ++_M_count; } |
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67 | size_t _M_decrement_use() { return --_M_count; } |
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68 | }; |
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69 | |||
70 | _Indexer* _M_index; |
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71 | |||
72 | template |
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73 | }; |
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74 | |||
75 | inline size_t |
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76 | gslice::start () const |
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77 | { return _M_index ? _M_index->_M_start : 0; } |
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78 | |||
79 | inline valarray |
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80 | gslice::size () const |
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81 | { return _M_index ? _M_index->_M_size : valarray |
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82 | |||
83 | inline valarray |
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84 | gslice::stride () const |
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85 | { return _M_index ? _M_index->_M_stride : valarray |
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86 | |||
87 | inline gslice::gslice () : _M_index(0) {} |
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88 | |||
89 | inline |
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90 | gslice::gslice(size_t __o, const valarray |
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91 | const valarray |
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92 | : _M_index(new gslice::_Indexer(__o, __l, __s)) {} |
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93 | |||
94 | inline |
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95 | gslice::gslice(const gslice& __g) : _M_index(__g._M_index) |
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96 | { if (_M_index) _M_index->_M_increment_use(); } |
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97 | |||
98 | inline |
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99 | gslice::~gslice() |
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100 | { if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index; } |
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101 | |||
102 | inline gslice& |
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103 | gslice::operator= (const gslice& __g) |
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104 | { |
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105 | if (__g._M_index) __g._M_index->_M_increment_use(); |
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106 | if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index; |
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107 | _M_index = __g._M_index; |
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108 | return *this; |
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109 | } |
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110 | |||
111 | |||
112 | } // std:: |
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113 | |||
114 | |||
115 | #endif /* _CPP_BITS_GSLICE_H */ |
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116 | |||
117 | // Local Variables: |
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118 | // mode:c++ |
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119 | // End: |