Should getSymbolsByUDA work with member variables?

[Basile B.]

On Friday, 28 February 2020 at 18:34:08 UTC, cc wrote:
> This compiles:
>
> class Foo {
> 	int x;
> 	@(1) void y() {}
> 	this() {
> 		static foreach (idx, field; getSymbolsByUDA!(Foo, 1)) {
> 		}
> 	}
> }
>
> This does not:
>
> class Foo {
> 	@(1) int x;
> 	void y() {}
> 	this() {
> 		static foreach (idx, field; getSymbolsByUDA!(Foo, 1)) {
> 		}
> 	}
> }
>
> Error: value of `this` is not known at compile time
>
> Is there an equivalent for getSymbolsByUDA for member 
> variables, or is this a bug?

I dont see a bug, the error message is correct.
I'd say that you have two options:

1. drop the `static` before `foreach`, for example to use the 
symbols during run-time
2. to do metaprog adopt another style of loop, e.g

class Foo {
	@(1) int x;
	void y() {}
	this() {
         alias AtOne = getSymbolsByUDA!(Foo, 1);
		static foreach (i; 0 .. AtOne.length) {
             pragma(msg, __traits(identifier, AtOne[i]));
		}
	}
}