Does anyone know why this code is not working? http://dpaste.dzfl.pl/b89e7b3f

It seems calling "enum a = __traits(getAttributes, Class.member);" is OK without an instance. But if I wrap the __traits call into another template with alias parameter like this:

-----------
auto getAttribute(alias target)()
{
    return __traits(getAttributes, target)[0];
}
-----------

I can no longer call it at compile time ("enum b =
getAttribute!(Class.member)").


What I want to do ultimately is assigning special values to all class members which have a specific UDA while avoiding runtime overhead as much as possible. In pseudo code:

------------
instance i1;

static foreach member in i1
    static if i1.hasUDA(UdaType)
        member = specialValue();
------------

Should compile down to only this:
instance i1;

i1.member1 =  specialValue();
i1.member2 =  specialValue();
i1.member3 =  specialValue();

On 7/23/13, Johannes Pfau <nospam@example.com> wrote:
> Does anyone know why this code is not working? http://dpaste.dzfl.pl/b89e7b3f

Add 'static' to getAttribute and it will work. I know, it's weird, and I've seen this sort of workaround used before. I think it's a compiler bug.

Am Wed, 24 Jul 2013 02:13:50 +0200
schrieb Andrej Mitrovic <andrej.mitrovich@gmail.com>:

> On 7/23/13, Johannes Pfau <nospam@example.com> wrote:
> > Does anyone know why this code is not working? http://dpaste.dzfl.pl/b89e7b3f
> 
> Add 'static' to getAttribute and it will work. I know, it's weird, and I've seen this sort of workaround used before. I think it's a compiler bug.

Thanks! I already feared I'd have to use some string mixin tricks :-)