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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 

#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&, const valarray&);

        // 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 () const;

        valarray stride () const;

    private:

        struct _Indexer {

            size_t _M_count;

            size_t _M_start;

            valarray _M_size;

            valarray _M_stride;

            valarray _M_index;

            _Indexer(size_t, const valarray&,

                     const valarray&);

            void _M_increment_use() { ++_M_count; }

            size_t _M_decrement_use() { return --_M_count; }

        };

        _Indexer* _M_index;

        template friend class valarray;

    };

    inline size_t

    gslice::start () const

    { return _M_index ? _M_index->_M_start : 0; }

    inline valarray

    gslice::size () const

    { return _M_index ? _M_index->_M_size : valarray(); }

    inline valarray

    gslice::stride () const

    { return _M_index ? _M_index->_M_stride : valarray(); }

    inline gslice::gslice () : _M_index(0) {}

    inline

    gslice::gslice(size_t __o, const valarray& __l,

                   const valarray& __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: