libaegis/aer/expr/lookup.h

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//
//      aegis - project change supervisor
//      Copyright (C) 1994, 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_EXPR_LOOKUP_H
#define AEGIS_AER_EXPR_LOOKUP_H

#include <common/nstring.h>
#include <libaegis/aer/expr.h>

class rpt_expr_lookup:
    public rpt_expr
{
public:
    virtual ~rpt_expr_lookup();

private:
    rpt_expr_lookup(const rpt_expr::pointer &lhs, const rpt_expr::pointer &rhs);

public:
    static rpt_expr::pointer create(const rpt_expr::pointer &lhs,
        const rpt_expr::pointer &rhs);

    static rpt_expr::pointer create(const rpt_expr::pointer &lhs,
        const nstring &rhs);

protected:
    // See base class for documentation.
    bool lvalue() const;

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

private:
    rpt_expr_lookup();

    rpt_expr_lookup(const rpt_expr_lookup &);

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

#endif // AEGIS_AER_EXPR_LOOKUP_H