SundanceConstantExpr.hpp

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#ifndef SUNDANCE_CONSTANTEXPR_H
#define SUNDANCE_CONSTANTEXPR_H

#include "SundanceSpatiallyConstantExpr.hpp"

namespace Sundance
{

/**
 * ConstantExpr contains an immutable constant, to be distinguished
 * from a parameter that is constant in space but can change
 * during the course of a simulation.
 */
class ConstantExpr : public SpatiallyConstantExpr
{
public:
  ConstantExpr(const double& value);
  virtual ~ConstantExpr() {;}

  /** */
  virtual std::ostream& toText(std::ostream& os, bool paren) const ;

  /** */
  virtual XMLObject toXML() const ;

  /** */
  virtual bool isImmutable() const {return true;}

          
  /** */
  virtual void setValue(const double& value) {value_ = value;}
          
  /** */
  virtual const double& value() const {return value_;}

  /** Ordering operator for use in transforming exprs to standard form */
  virtual bool lessThan(const ScalarExpr* other) const ;

  /** */
  virtual Set<MultipleDeriv> 
  internalFindW(int order, const EvalContext& context) const ;

  /** Find spatially-constant functional derivatives */
  virtual Set<MultipleDeriv> 
  internalFindC(int order, const EvalContext& context) const ;

  /** Find spatially-variable functional derivatives */
  virtual Set<MultipleDeriv> 
  internalFindV(int order, const EvalContext& context) const ;
          


  /** */
  virtual RCP<ExprBase> getRcp() {return rcp(this);}


protected:
private:
  double value_;
};
}

#endif