Re: variant .init value

[bauss via Digitalmars-d-learn]

On Thursday, 7 February 2019 at 07:33:50 UTC, Norm wrote:
Hi,
I'm trying to use Variant in a struct and want a default init 
value like so:

---
struct S {
  Variant v = Variant(10);
}
void main() {auto s = S();}

but when I try to build this I get the following error:

dmd2/linux/bin64/../../src/phobos/std/variant.d(661): Error: 
memcpy cannot be interpreted at compile time, because it has no 
available source code
Error: cannot interpret <error> at compile time
---

I don't particularly need or want this to be available at 
compile time, I really only want the struct to have a default 
value when instantiated at runtime.

Is there a way to do this with a Variant member?

Thanks,
Norm

I know this is not ideal, but here is a "workaround":

struct S {
  Variant v;

  static S opCall()
  {
      S s;
      s.v = Variant(10);
      return s;
  }
}

Would have worked better if structs allowed default ctor in D, 
but they don't unfortunately.