exp.h

/***************************************************************************
 *   Copyright (C) 2004-2006 by Radko Mihal                                *
 *   rmihal@pobox.sk                                                       *
 *                                                                         *
 *   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 2 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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
 ***************************************************************************/
#ifndef EXP_H
#define EXP_H

template< class Type > class expression;


template< class Type >
class exp_class
{
        grammar_to_parser::pattern_parser                               m_exp;
        grammar_to_parser::pattern_parser                               m_left;
        grammar_to_parser::choice< expression<Type> >   m_x;
        grammar_to_parser::pattern_parser                               m_right;

public:
        exp_class() : m_exp( "exp" ), m_left("("), m_right(")") {};
//      exp_class() : m_exp( L"exp" ), m_left(L"("), m_right(L")") {};
        
        void push_parsers( grammar_to_parser::parsers& l )
        {
                l.push_back( &m_exp );
                l.push_back( &m_left );
                l.push_back( &m_x );
                l.push_back( &m_right );
        }

        Type evaluate()
        {
                return exp( m_x->evaluate() );
        }
};

#endif

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