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/*
* Modification History
*
* 2003-April-28 Jason Rohrer
* Created.
*/
#ifndef LN_EXPRESSION_INCLUDED
#define LN_EXPRESSION_INCLUDED
#include "Expression.h"
#include "UnaryOperationExpression.h"
#include <math.h>
/**
* Expression implementation of a unary ln (natural log) operation.
*
* @author Jason Rohrer
*/
class LnExpression : public UnaryOperationExpression {
public:
/**
* Constructs a unary ln operation expression.
*
* Argument is destroyed when the class is destroyed.
*
* @param inArgument the argument.
*/
LnExpression( Expression *inArgument );
/**
* A static version of getID().
*/
static long staticGetID();
// implements the Expression interface
virtual double evaluate();
virtual long getID();
virtual void print();
virtual Expression *copy();
protected:
static long mID;
};
// static init
long LnExpression::mID = 10;
inline LnExpression::LnExpression( Expression *inArgument )
: UnaryOperationExpression( inArgument ) {
}
inline double LnExpression::evaluate() {
return log( mArgument->evaluate() );
}
inline long LnExpression::getID() {
return mID;
}
inline long LnExpression::staticGetID() {
return mID;
}
inline void LnExpression::print() {
printf( "( ln" );
mArgument->print();
printf( " )" );
}
inline Expression *LnExpression::copy() {
LnExpression *copy =
new LnExpression( mArgument->copy() );
return copy;
}
#endif
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