translate a macro to D

[Trass3r]

> The  TYPESIZE macro is used within another macro which defines constants.
> #define M(a,b,size) \
> 	 ((a) << SHIFT_A) | \
> 	 ((b)   << SHIFT_B) | \
> 	 ((size) << SHIFT_SIZE))
> #define MM(a,b,type)	    M((a),(b),(TYPESIZE(type)))
>
> Example:
> #define C1    MM(1, 2, struct A)
> #define C2    MM(3, 4, struct B)
>
> How can I translate that to D?

You could just get rid of that extra macro and directly pass A.sizeof.
Otherwise you need to use templates.
Can't say more cause I can't imagine what the heck this code is used for.