Get struct template types

[ed]

Hi,

given a struct like so:
struct S(alias N, T) {...}

is there a way to get the template parameters of S? Something 
like:

S.typetuple[0] == N,
S.typetuple[1] == T

I've had a look at std.typecons and std.typetuple but I don't see 
what I'm missing something and cannot see a way to do the above.

Thanks,
ed