C# Memoization of functions with arbitrary number of arguments [closed]

Answer 1

I initially came here just looking for an abstract memoization method for a no-parameter function. This isn't exactly an answer to the question but wanted to share my solution in case someone else came looking for the simple case.

public static class MemoizationExtensions
{
    public static Func Memoize(this Func f)
    {
        bool hasBeenCalled = false; // Used to determine if we called the function and the result was the same as default(R)
        R returnVal = default(R);
        return () =>
        {
            // Should be faster than doing null checks and if we got a null the first time, 
            // we really want to memoize that result and not inadvertently call the function again.
            if (!hasBeenCalled)
            {
                hasBeenCalled = true;
                returnVal = f();
            }
            return returnVal;
        };
    }
}

If you use LinqPad you can use the following code to easily test out the functionality through the use of LinqPad's super cool Dump method.

new List>(new Func