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| // The template and inlines for the -*- C++ -*- gslice class. |
| |
| // Copyright (C) 1997-2001 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 2, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING. If not, write to the Free |
| // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| // USA. |
| |
| // As a special exception, you may use this file as part of a free software |
| // library without restriction. Specifically, if other files instantiate |
| // templates or use macros or inline functions from this file, or you compile |
| // this file and link it with other files to produce an executable, this |
| // file does not by itself cause the resulting executable to be covered by |
| // the GNU General Public License. This exception does not however |
| // invalidate any other reasons why the executable file might be covered by |
| // the GNU General Public License. |
| |
| // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr> |
| |
| #ifndef _CPP_BITS_GSLICE_H |
| #define _CPP_BITS_GSLICE_H 1 |
| |
| #pragma GCC system_header |
| |
| namespace std { |
| |
| class gslice |
| { |
| public: |
| gslice (); |
| gslice (size_t, const valarray<size_t>&, const valarray<size_t>&); |
| // XXX: the IS says the copy-ctor and copy-assignment operators are |
| // synthetized by the compiler but they are just unsuitable |
| // for a ref-counted semantic |
| gslice(const gslice&); |
| ~gslice(); |
| |
| // XXX: See the note above. |
| gslice& operator= (const gslice&); |
| |
| size_t start () const; |
| valarray<size_t> size () const; |
| valarray<size_t> stride () const; |
| |
| private: |
| struct _Indexer { |
| size_t _M_count; |
| size_t _M_start; |
| valarray<size_t> _M_size; |
| valarray<size_t> _M_stride; |
| valarray<size_t> _M_index; |
| _Indexer(size_t, const valarray<size_t>&, |
| const valarray<size_t>&); |
| void _M_increment_use() { ++_M_count; } |
| size_t _M_decrement_use() { return --_M_count; } |
| }; |
| |
| _Indexer* _M_index; |
| |
| template<typename _Tp> friend class valarray; |
| }; |
| |
| inline size_t |
| gslice::start () const |
| { return _M_index ? _M_index->_M_start : 0; } |
| |
| inline valarray<size_t> |
| gslice::size () const |
| { return _M_index ? _M_index->_M_size : valarray<size_t>(); } |
| |
| inline valarray<size_t> |
| gslice::stride () const |
| { return _M_index ? _M_index->_M_stride : valarray<size_t>(); } |
| |
| inline gslice::gslice () : _M_index(0) {} |
| |
| inline |
| gslice::gslice(size_t __o, const valarray<size_t>& __l, |
| const valarray<size_t>& __s) |
| : _M_index(new gslice::_Indexer(__o, __l, __s)) {} |
| |
| inline |
| gslice::gslice(const gslice& __g) : _M_index(__g._M_index) |
| { if (_M_index) _M_index->_M_increment_use(); } |
| |
| inline |
| gslice::~gslice() |
| { if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index; } |
| |
| inline gslice& |
| gslice::operator= (const gslice& __g) |
| { |
| if (__g._M_index) __g._M_index->_M_increment_use(); |
| if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index; |
| _M_index = __g._M_index; |
| return *this; |
| } |
| |
| |
| } // std:: |
| |
| |
| #endif /* _CPP_BITS_GSLICE_H */ |
| |
| // Local Variables: |
| // mode:c++ |
| // End: |