On Saturday, December 16, 2017 15:28:46 Marc via Digitalmars-d-learn wrote:
> On Saturday, 16 December 2017 at 07:23:38 UTC, Jonathan M Davis
>
> wrote:
> > On Saturday, December 16, 2017 04:01:10 Marc via
> >
> > Digitalmars-d-learn wrote:
> >> how do I from class:
> >> > class Person {
> >> >
> >> > string name;
> >> > int age;
> >> >
> >> > }
> >>
> >> do:
> >> > auto c = [__traits(allMembers, Person)];
> >>
> >> then return only ["name", "age"] rather ["name, "age", "ctor",
> >> "toString" ... ]?
> >
> > Try __traits(derivedMembers, Person).
> >
> > https://dlang.org/spec/traits.html#derivedMembers
> >
> > Depending on what you want though, it's not all that uncommon
> > to use a variety of traits to filter the list down to whatever
> > it is that you actually want. std.traits and std.meta are your
> > friends in addition to __traits.
> >
> > - Jonathan M Davis
>
> It derivedMembers worked but I didn't understand how so. It
> returned the proper array ["name", "age", "this"] but how are
> them derived? or it's D's design that every class is implicitily
> derived from a "main objet"?
> Thanks for your suggeston on std.traits and std.meta, I didn't
> know about the last one.
Every class in D other than Object is derived from another class. So, I
assume that the derived in derivedMembers was chosen to indicate that it
didn't include any members from base classes. So, it's not that the members
are derived from anything; it's that the members come from the derived
class.
- Jonathan M Davis
