On Thu, 01 Nov 2018 11:35:27 -0700, Ali Çehreli wrote:
> On 11/01/2018 09:14 AM, Neia Neutuladh wrote:
>> The spec says that a user-defined attribute must be an expression, but
>> DMD accepts a wide range of things as UDAs:
>>
>> struct Foo { string name = "unknown"; }
>> @Foo int bar;
>>
>> `bar` has the *type* Foo as an attribute. It's not an *instance* of
>> Foo. So if I try to look at the UDAs:
>
> That would work with hasUDA(). I have an example here:
>
> http://ddili.org/ders/d.en/uda.html
That lets me test for presence, nothing more. While that's useful, I
usually have a UDA struct whose fields I need to access.
std.traits.getUDAs doesn't hide the difference between @Foo and @Foo(), so
that's also not an option. I could use a customized version of that that
replaces @Type with @Type.init, and that's a reasonable choice when I know
other people aren't going to deal with that annotation type.
