version in enum

[Basile B. via Digitalmars-d-learn]

On Saturday, 9 January 2016 at 12:43:32 UTC, Øivind wrote:
> Hi,
>
> Why doesn't this work? Seems like it should:
>
> enum {
> 	A = 1,
> 	version(xx) {
> 		B = 2
> 	}
> }

It's not allowed in the grammar but I agree with you, it could be 
useful. Recent example where it could:

---
enum VirtualKey
{
    version(linux) VK_UP = 0;  version(Win32) VK_UP = 1,
    ....
}
---

a solution is to define a manifest constant depending on your 
version() and to use a ternary expression in the enum definition. 
For me then this works:

---
version(linux) enum ver = true;
else enum ver = false;

enum VirtualKey
{
    VK_UP = (ver) ? 0 : 1,
}
---

Not ideal but it works.