Re: need help to check symbol is static variable or not

[Dakota via Digitalmars-d-learn]

On Monday, 1 July 2024 at 11:15:46 UTC, Nick Treleaven wrote:

On Monday, 1 July 2024 at 07:32:30 UTC, Dakota wrote:

this code give error:

```d
static if(  !__traits(compiles, mixin("enum v = V;")) ) {
   enum v = V;
}

```

__traits(compiles, ...) can't check if a declaration is valid directly. You have to wrap it in a function literal expression:

```d
enum isStatic(alias V) = __traits(compiles, { enum v = V; });

extern const float NotWorkVar;
const float Works = 2;

pragma(msg, isStatic!NotWorkVar); // false
pragma(msg, isStatic!Works); // true
```

Thanks, this work for me.