Function parameters UDAs

[Radu]

On Wednesday, 14 November 2018 at 18:05:55 UTC, Adam D. Ruppe 
wrote:
> On Wednesday, 14 November 2018 at 16:28:19 UTC, Radu wrote:
>> Looks like that there is no easy way to extract a function 
>> parameters UDA list.
>
> Indeed, the only way I can find is kinda crazy:
>
> ---
> void foo(int f, @("test") string s) {}
>
> void main() {
>         static if(is(typeof(foo) Params == __parameters))
>                 pragma(msg, __traits(getAttributes, 
> Params[1..2])); // get the second param
> }
> ---
>
>
> So, the process is:
>
> 1) alias the params with the static if + is() statement (this 
> is what std.traits.Parameters does internally)
>
> 2) slice the params! using params[0] will not work, but 
> params[0 .. 1] will.
>
> 3) get the attributes using the language function

Yes, that does the trick, thanks!