So, User-Defined Attributes

[Jacob Carlborg]

On 2013-01-04 16:45, Philippe Sigaud wrote:

> Syntax:
>
> @(3) int a;
> @("string", 7) int b;
>
> enum Foo;
> @Foo int c;
>
> struct Bar
> {
>      int x;
> }
>
> @Bar(3) int d;
>
>
>  From that, I get we can put any CT symbol (even a value) as an
> attribute. I thought we were restricted to user defined types.

No, basically anything that can be put in a tuple can be used as an UDA. 
I'm wondering if we want to add a meta attribute to Phobos or druntime 
(object.d). Some thing like:

enum attribute;

@attribute struct Foo { }

Now, by convention "Foo" is an attribute and should only be used as an 
attribute. We could also add some functions to std.traits for querying 
UDA that takes advantage of this attribute.

-- 
/Jacob Carlborg