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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:
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