Question

is there some ‘where’ type contraints in can add to make the follwing code compile ?

public class Plus<T> : BinaryOperator<T> where T : ...
{
    public override T Evaluate(IContext<T> context)
    {
        return left.Evaluate(context) + right.Evaluate(context);
    }
}

Thanks 🙂

Answer 1

There are no such devices in C#. A few options are available, though:

• in C# 4.0 and .NET 4.0 (or above), use dynamic, which supports + but offers no compile time checking
• in .NET 3.5 (or above), MiscUtil offers an Operator class which makes operators available as methods – again, without any compile-time checking

So either:

return (dynamic)left.Evaluate(context) + (dynamic)right.Evaluate(context);

or

return Operator.Add(left.Evaluate(context), right.Evaluate(context));