iterate traits ?

[Philippe Sigaud via Digitalmars-d-learn]

>> A foreach becomes compile-time whenever the aggregate is a purely compile-
>> time construct such as a tuple.

Yeah, I think you transformed it into a runtime array by using [ ...
]. Tuples with compatible types can be 'downgraded' to arrays that
way. But there is no need to: tuples are iterable, indexable and
slice-able in D.

import std.stdio;

struct Vertex {float[3] position; float[3] normal;}

void main() {
    foreach(e; __traits(allMembers, Vertex)) {
        alias tt = typeof(__traits(getMember, Vertex, e)); // worksforme
        writeln(tt.sizeof);

    }
}