Constructing a tuple dynamically

[thedeemon via Digitalmars-d-learn]

On Tuesday, 3 February 2015 at 10:32:47 UTC, Pena wrote:
> How can I use this code or something similar to dynamically
> construct a tuple containing types of fields marked as 
> @Cloneable?

import std.traits, std.typetuple;

template CloneableTypes(S) {
   template IsCloneable(string M) {
     enum IsCloneable = staticIndexOf!(Cloneable, 
__traits(getAttributes, __traits(getMember, S, M))) >= 0;
   }

   template FieldType(string M) {
     alias FieldType = typeof(__traits(getMember, S, M));
   }

   alias CloneableTypes = staticMap!(FieldType, 
Filter!(IsCloneable, __traits(allMembers, S)));
}

Then CloneableTypes!Foo is a TypeTuple (int, string).