/// <summary>
/// Accepts a visitor evaluating the numeric expression.
/// </summary>
/// <param name="visitor">Evaluation visitor.</param>
/// <returns>Result value of the numeric expression.</returns>
public double Accept(INumericExpressionEvaluationVisitor visitor)
{
return(LeftChild.Accept(visitor) - RightChild.Accept(visitor));
}
/// <summary>
/// Accepts a generic numeric expression visitor.
/// </summary>
/// <param name="visitor">Visitor.</param>
public void Accept(INumericExpressionVisitor visitor)
{
LeftChild.Accept(visitor);
RightChild.Accept(visitor);
visitor.PostVisit(this);
}
/// <summary>
/// Accepts a visitor evaluating the logical expression.
/// </summary>
/// <param name="visitor">Evaluation visitor.</param>
/// <returns>True if the expression is logically true. False otherwise.</returns>
public bool Accept(IExpressionEvalVisitor visitor)
{
// (a imply b) ~ (not(a) or b)
return(!LeftChild.Accept(visitor) || RightChild.Accept(visitor));
}