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Diffstat (limited to 'contrib/libstdc++/std/gslice.h')
-rw-r--r-- | contrib/libstdc++/std/gslice.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/contrib/libstdc++/std/gslice.h b/contrib/libstdc++/std/gslice.h new file mode 100644 index 000000000000..4f6e854a14c0 --- /dev/null +++ b/contrib/libstdc++/std/gslice.h @@ -0,0 +1,111 @@ +// 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: |