Bitfield-style enum to strings?

[Baz via Digitalmars-d-learn]

On Thursday, 7 May 2015 at 17:41:10 UTC, Nick Sabalausky wrote:
> Assuming a plain old bitfield-style enum like:
>
> enum Foo {
>     optionA = 1<<0;
>     optionB = 1<<1;
>     optionC = 1<<2;
>     optionD = 1<<3;
>     optionE = 1<<4;
> }
>
> Does a function already exist somewhere to take an instance of 
> Foo and get a list of the switch names as strings?
>
> Something kinda like:
>
> Foo fooVar = Foo.optionB | Foo.optionD;
> assert(
>     DOES_THIS_FUNC_EXIST(fooVar)
>         .equals(["optionB", "optionD"])
> );
>
> Seems entirely feasible, although my traits-fu is a bit rusty.

Hi, i have a specialized struct for "bit sets" that handles the 
string representation:

https://github.com/BBasile/enumset/blob/master/import/enumset.d#L242

however it's not std. Building the string is easy (cf toString()) 
but if it can help...