Idiomatic way to check for UDA?

[ketmar via Digitalmars-d-learn]

On Sun, 07 Jun 2015 11:37:29 +0000, Marc Schütz wrote:

> On Sunday, 7 June 2015 at 06:20:55 UTC, ketmar wrote:
>> On Sun, 07 Jun 2015 05:32:46 +0000, Tofu Ninja wrote:
>>
>>> Whats the idiomatic way to check if an identifier has a specific UDA
>>> attached to it.
>>> 
>>> Also what should I use to define a UDA that doesn't need to carry any
>>> data? Just an empty template? Or does something else make more sense?
>>
>> there is `std.traits.hasUDA` added to phobos recently.
> 
> Service: https://github.com/D-Programming-Language/phobos/pull/3356
> https://github.com/D-Programming-Language/phobos/pull/3363

thank you, i should provide the links from the start, so OP can copypaste 
the code.
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