Question

I am new to c#. I am trying to declare a delegate function which takes 2 generics inputs.
I am having problems compile it. can anyone tell me what is the problem here.

delegate int ippcFuncPtr<in T1, in T2>(T1 param, T2 returnval);

static int ippcServerRegisterProcedure(int handle, 
    string procedureName, ippcFuncPtr<in T1, in T2> procedure)
    {
        return 0;
    }

Thanks,
Eyal

Answer 1

You don’t need to redeclare the contravariance in the parameter, but you do need to give the method type parameters, unless it’s in a generic type:

static int ippcServerRegisterProcedure<T1, T2>(int handle, string procedureName,
                                               ippcFuncPtr<T1, T2> procedure)

I’d also strongly recommend that you follow .NET naming conventions – and use the standard delegates where possible… so in this case:

static int RegisterIpccServerProcedure<T1, T2>(int handle, string procedureName,
                                               Func<T1, T2, int> procedure)