Extract typeinfo

[Adam D. Ruppe]

On Wednesday, 5 March 2014 at 19:15:12 UTC, Namespace wrote:
> Is there a way to extract the correct typeinfo of an array if I 
> only have the pointer?

Nope, typeinfos are only stored in runtime on classes. All other 
types get it only through the static info.

Consider the following:

char[10] a;

char[] b = a[3..5];// from the middle of it

void* c = b.ptr;


Even if the info was stored with a, the slice would have no idea 
where to find it, so you couldn't get it from the pointer either.


The way druntime does it with void pointers is to pass the 
typeinfo too:

void useArray(void[] a, TypeInfo a_type);