Possible to create a single multi-type collection of multi-type lambda functions in C# 4.0?

Question

For instance, something like:

Dictionary<string, Func<T1, T2, bool>> comparisons;
    comparisons.add("<", (x, y) => x < y);
    comparisons.add("==", (x, y) => x == y);
    comparisons.add(">", (x, y) => x > y);

At this point, I don't know enough about C# lambdas and multi-type generic containers to be able to put this together correctly. Is this even possible?

Answer 1

Yes, it's perfectly valid to have something like this:

Dictionary<string, Func<int, int, bool>> comparisons = new Dictionary<string, Func<int, int, bool>>();

comparisons.Add("<", (x, y) => x < y);
comparisons.Add("==", (x, y) => x == y);
comparisons.Add(">", (x, y) => x > y);

In your example though, you need to be using Func<int, int, bool>, since you take two parameters and return a boolean value.

You could also put this in a generic implementation, but then you'd need some way of constraining it so that anything must implement <, ==, and > operators.