On Tuesday, 6 November 2012 at 15:18:55 UTC, Walter Bright wrote:
I don't know what use UDAs would be for parameters.
It's pretty much the same as anywhere else: to add useful data for reflection. A few I'd use it for is providing user visible data like label and hint for automatic UI generation, or styling hints again for the auto ui (e.g. "use a multi-line input for this string").
We could also potentially put validation in there, though this may be on the type as well. Or put on info to check for availability of a username.
If you do an automatic UI generator, attributes on the parameters have a lot of uses. Other than that, well, I don't know, but that's probably just because I haven't done it yet!
