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Whole document tree                   gslice.h Go to the documentation of this file. // 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: