libaegis/aer/value.h

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//
//      aegis - project change supervisor
//      Copyright (C) 1994, 1996, 2002-2008 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_H
#define AEGIS_AER_VALUE_H

#include <common/ac/shared_ptr.h>
#include <common/ac/stddef.h>


class rpt_value
{
public:
    typedef aegis_shared_ptr<rpt_value> pointer;

    virtual ~rpt_value();

protected:
    rpt_value();

public:
    static rpt_value::pointer integerize(const rpt_value::pointer &vp);

    static rpt_value::pointer realize(const rpt_value::pointer &vp);

    static rpt_value::pointer arithmetic(const rpt_value::pointer &vp);

    static rpt_value::pointer undefer(const rpt_value::pointer &vp);

    static rpt_value::pointer stringize(const rpt_value::pointer &vp);

    static rpt_value::pointer booleanize(const rpt_value::pointer &vp);

    virtual const char *name() const = 0;

    virtual bool is_an_error() const;

    virtual bool is_a_struct() const;

    virtual rpt_value::pointer lookup(const rpt_value::pointer &rhs,
        bool lvalue) const;

    virtual rpt_value::pointer keys() const;

    virtual rpt_value::pointer count() const;

    virtual const char *type_of() const;

protected:
    virtual rpt_value::pointer integerize_or_null() const;

    virtual rpt_value::pointer realize_or_null() const;

    virtual rpt_value::pointer arithmetic_or_null() const;

    virtual rpt_value::pointer undefer_or_null() const;

    virtual rpt_value::pointer stringize_or_null() const;

    virtual rpt_value::pointer booleanize_or_null() const;

private:
    rpt_value(const rpt_value &);

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

#endif // AEGIS_AER_VALUE_H