Re: Should getSymbolsByUDA work with member variables?

[Basile B. via Digitalmars-d-learn]

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]));
                }
        }
}