Modify Function Pointer to Take Additional Parameters

[Nicholas Wilson via Digitalmars-d-learn]

On Friday, 19 February 2016 at 05:41:01 UTC, jmh530 wrote:
> I'm trying to write a function that will adjust the parameters 
> of a function pointer.
>

I think the problem is that it defaults to a delegate not that it 
cannot be one
does clarifying this to the compiler work

Like
> alias fp1 = int function(int x);
> alias fp2 = int function(int x, int y);
>
> auto foo(T)(T f)
> {
> 	static if (is(T == fp2))
> 		return f;
> 	else static if (is(T == fp1))
> 	{
> 		return int function(int x, int y) => f(x);
> 	}
> 	else
> 		return 0;
> }
>
?