protected virtual Out DispatchCompare(CompareVisitor cmp, Expr left, Expr right, Expr original, In data)
{
if (Decoder.IsConstant(left) && Decoder.OperatorFor(right) == ExpressionOperator.Sub)
// const OP (a - b)
{
int num;
if (Decoder.TryValueOf(left, ExpressionType.Int32, out num) && num == 0)
{
// 0 OP (a-b) ==> b OP a
return(cmp(Decoder.RightExpressionFor(right),
Decoder.LeftExpressionFor(right), right, data));
}
}
else if (Decoder.IsConstant(right) && Decoder.OperatorFor(left) == ExpressionOperator.Sub)
// (a-b) OP const
{
int num;
if (Decoder.TryValueOf(right, ExpressionType.Int32, out num) && num == 0)
{
// (a-b) OP 0 ==> a OP b
return(cmp(Decoder.LeftExpressionFor(left),
Decoder.RightExpressionFor(left), left, data));
}
}
return(cmp(left, right, original, data));
}
protected override IntervalEnvironmentBase <TVar, TExpr, TInterval, TNumeric> DispatchCompare(
CompareVisitor cmp, TExpr left, TExpr right, TExpr original,
IntervalEnvironmentBase <TVar, TExpr, TInterval, TNumeric> data)
{
data = cmp(left, right, original, data);
return(base.DispatchCompare(cmp, left, right, original, data));
}