Question

I want to write a generic function to calculate factorial in C# … like:

 static T Factorial<T>(T n)
        {
            if (n <= 1)
                return 1;

            return Factorial<T>(n - 1);
        }

but obviously having restriction that we can’t perform operations on type ‘T‘. any alternative?

Answer 1

 public T Factorial<T>(T a, T b, Multiply<T> delegateMutliply, Difference<T> diffDelegate, BaseCondition<T> baseDelegate)
    {
        if (!baseDelegate(a, b))
            return b;

        return delegateMutliply(a, Factorial<T>(diffDelegate(a), b, delegateMutliply, diffDelegate, baseDelegate));
    }

int y = p.Factorial(3, 1, (a, b) => a * b, (a) => –a, (a, b) => (a <= b) ? false : true);