On Monday, 3 August 2020 at 03:00:08 UTC, Cecil Ward wrote:
When practically speaking would you use UDAs? A real-world use-case?
They are useful when you want to attach some kind of metadata to the declarations for a library to read. For example, my script.d looks for `@scriptable` for methods that it should expose to the script user. My cgi.d uses things like `@URLName("foo")` and/or `@DisplayName("whatever")` if you want to override the auto-wrapper's default strings.
My day job work project uses it for user-visible documentation of their functions too, accessible from a command line interface.
I’ve seen them in use already for core language features instead of keywords like "pure"
i wouldn't call those UDAs because they aren't user-defined... but yeah it is the same syntax there basically too.
