How do you test whether a variable is static or not?

[Jonathan M Davis]

On Saturday, June 16, 2018 22:56:38 DigitalDesigns via Digitalmars-d-learn 
wrote:
> On Saturday, 16 June 2018 at 21:41:37 UTC, Jonathan M Davis wrote:
> > On Saturday, June 16, 2018 14:55:51 Steven Schveighoffer via
> >
> > Digitalmars-d- learn wrote:
> >> On 7/30/16 8:47 AM, Jonathan M Davis via Digitalmars-d-learn
> >>
> >> wrote:
> >> > I'm writing some serialization code where I need to skip
> >> > static variables. So, I have a symbol from a struct, and I'd
> >> > like to test whether it's static or not. Ideally, I'd be
> >> > able to do something like
> >> >
> >> > is(field == static)
> >>
> >> std.traits.hasStaticMember ?
> >>
> >> https://dlang.org/phobos/std_traits.html#hasStaticMember
> >
> > Yeah. I wrote that, and it got added to Phobos. If you'll note,
> > my post in this thread was from almost two years ago.
> >
> > - Jonathan M Davis
>
> doesn't work:
>
> ..\..\src\phobos\std\traits.d(3823): Error: class `app.A` member
> `z` is not accessible.
>
> What is the point of introspection if one can't get information
> about a type due to it's protection level?
>
> For example, how is one suppose to serialize a class that has
> protected and private members, which are common, when using
> properties?

The fact that you can't introspect on private variables with stuff like
__traits is a well-known bug, and I expect that it will be fixed at some
point. But if it's serialization that you want, then as I understand it,
tupleof should work to get at the direct fields of a struct or class even if
they're private. And you can always look at what a serialization library
like Orange did.

- Jonathan M Davis