base/BinaryOpExpression

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/* **-*-c++-*-**************************************************************
  Copyright (C)2002 David Jung <opensim@pobox.com>

  This program/file 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. (http://www.gnu.org)
  
  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
  $Id: BinaryOpExpression 1029 2004-02-11 20:45:54Z jungd $
  $Revision: 1.8 $
  $Date: 2004-02-11 15:45:54 -0500 (Wed, 11 Feb 2004) $
  $Author: jungd $
 
****************************************************************************/

#ifndef _BASE_BINARYOPEXPRESSION_
#define _BASE_BINARYOPEXPRESSION_

#include <base/base>
#include <base/ExpressionNode>


namespace base {


//
// Super class of all binary operator experssions
//

class BinaryOpExpression : public ExpressionNode
{
public:
  BinaryOpExpression(ref<ExpressionNode> left, ref<ExpressionNode> right)
    : leftArg(left), rightArg(right) {}
  BinaryOpExpression(const BinaryOpExpression& e)
    : leftArg(e.leftArg), rightArg(e.rightArg) {}

  virtual void serialize(Serializer& s) { s.baseRef(leftArg,"lhs"); s.baseRef(rightArg, "rhs"); }

protected:
  BinaryOpExpression() {}

  virtual void cacheValue(const Vector& params) const = 0; ///< perform evaluation with params and sore in value (& set valueCached true)
  virtual void resetCache() const { valueCached=false; leftArg->resetCache(); rightArg->resetCache(); }

  virtual void cacheDerivative(Int withRespectToIndex) const = 0; ///< perform differentiation and cache in derivative (& set set derivCached)
  virtual void resetDerivCached() const 
    {
      derivCached=false; 
      leftArg->resetDerivCached(); 
      rightArg->resetDerivCached(); 
      derivative = ref<ExpressionNode>(0);
    }

  virtual void operationCounts(Int& addsub, Int& multdiv, Int& trig) const 
    {
      leftArg->operationCounts(addsub,multdiv,trig); 
      rightArg->operationCounts(addsub,multdiv,trig); 
    }
 
  ref<ExpressionNode> leftArg;
  ref<ExpressionNode> rightArg;

  friend class Expression;
};

} // base

#endif

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