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- // The template and inlines for the -*- C++ -*- gslice class.
-
- // Copyright (C) 1997-1999 Cygnus Solutions
- //
- // 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 __GSLICE__
- #define __GSLICE__
-
- extern "C++" {
-
- 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; }
- };
-
-
- class gslice
- {
- public:
- gslice ();
- gslice (size_t, const valarray<size_t>&, const valarray<size_t>&);
- gslice(const gslice&);
- ~gslice();
-
- gslice& operator= (const gslice&);
- size_t start () const;
- valarray<size_t> size () const;
- valarray<size_t> stride () const;
-
- private:
- _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 _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;
- }
-
-
- } // extern "C++"
-
- #endif // __GSLICE__
-
- // Local Variables:
- // mode:c++
- // End:
-