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/*
* Modification History
*
* 2001-February-11 Jason Rohrer
* Created.
*
* 2001-March-10 Jason Rohrer
* Added implementation of copy function.
*
* 2001-September-9 Jason Rohrer
* Added an extractArgument() implemenation.
*/
#ifndef CONSTANT_EXPRESSION_INCLUDED
#define CONSTANT_EXPRESSION_INCLUDED
#include "Expression.h"
/**
* Expression implementation of a constant.
*
* @author Jason Rohrer
*/
class ConstantExpression : public Expression {
public:
/**
* Constructs a constant expression.
*
* @param inValue the constant value.
*/
ConstantExpression( double inValue );
/**
* Sets the constant value.
*
* @param inValue the constant value.
*/
void setValue( double inValue );
/**
* Gets the constant value.
*
* @return the constant value.
*/
double getValue();
/**
* A static version of getID().
*/
static long staticGetID();
// implements the Expression interface
virtual double evaluate();
virtual long getNumArguments();
virtual long getID();
virtual Expression *copy();
virtual Expression *getArgument( long inArgumentNumber );
virtual void setArgument( long inArgumentNumber,
Expression *inArgument );
virtual Expression *extractArgument( long inArgumentNumber );
virtual void print();
protected:
double mValue;
static long mID;
};
// static init
long ConstantExpression::mID = 1;
inline ConstantExpression::ConstantExpression( double inValue )
: mValue( inValue ) {
}
inline void ConstantExpression::setValue( double inValue ) {
mValue = inValue;
}
inline double ConstantExpression::getValue() {
return mValue;
}
inline double ConstantExpression::evaluate() {
return mValue;
}
long ConstantExpression::getNumArguments() {
return 0;
}
inline long ConstantExpression::getID() {
return mID;
}
inline Expression *ConstantExpression::getArgument(
long inArgumentNumber ) {
return NULL;
}
inline void ConstantExpression::setArgument( long inArgumentNumber,
Expression *inArgument ) {
// do nothing
return;
}
inline Expression *ConstantExpression::extractArgument(
long inArgumentNumber ) {
return NULL;
}
inline Expression *ConstantExpression::copy() {
ConstantExpression *copy = new ConstantExpression( mValue );
return copy;
}
inline long ConstantExpression::staticGetID() {
return mID;
}
inline void ConstantExpression::print() {
printf( "( %f )", mValue );
}
#endif
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