libaegis/aer/value/null.h

Go to the documentation of this file.

//
//      aegis - project change supervisor
//      Copyright (C) 1994, 1996, 2002, 2005-2008 Peter Miller
//
//      This program 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 3 of the License, or
//      (at your option) any later version.
//
//      This program 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 program. If not, see
//      <http://www.gnu.org/licenses/>.
//

#ifndef AEGIS_AER_VALUE_NULL_H
#define AEGIS_AER_VALUE_NULL_H

#include <libaegis/aer/value.h>

class rpt_value_null:
    public rpt_value
{
public:
    virtual ~rpt_value_null();

private:
    rpt_value_null();

public:
    static rpt_value::pointer create();

protected:
    // See base class for documentation.
    const char *name() const;

    // See base class for documentation.
    rpt_value::pointer arithmetic_or_null() const;

    // See base class for documentation.
    rpt_value::pointer stringize_or_null() const;

    // See base class for documentation.
    rpt_value::pointer booleanize_or_null() const;

    // See base class for documentation.
    rpt_value::pointer lookup(const rpt_value::pointer &rhs, bool lvalue) const;

    // See base class for documentation.
    rpt_value::pointer undefer() const;

    // See base class for documentation.
    rpt_value::pointer integerize_or_null() const;

    // See base class for documentation.
    rpt_value::pointer realize_or_null() const;

    // See base class for documentation.
    rpt_value::pointer keys() const;

    // See base class for documentation.
    rpt_value::pointer count() const;

private:
    rpt_value_null(const rpt_value_null &);

    rpt_value_null &operator=(const rpt_value_null &);
};

#endif // AEGIS_AER_VALUE_NULL_H