Inversion of conditional compilation statements

[ryuukk_]

On Saturday, 2 December 2023 at 15:48:02 UTC, Nick Treleaven 
wrote:
> On Saturday, 2 December 2023 at 15:03:25 UTC, ryuukk_ wrote:
>> I wish we could use ``version`` as expression, to void the 
>> repetition:
>>
>> ```D
>> import std.stdio;
>>
>> enum HasTest = version (Test) ? true : false;
>
> Tomek Sowiński wrote this template:
> ```d
> enum bool isVersion(string ver) = !is(typeof({
>           mixin("version(" ~ ver ~ ") static assert(0);");
>     }));
>
> static assert(isVersion!"assert");
> static assert(!isVersion!"Broken");
> ```

I have something similar that i found somewhere here

```D

struct Version
{
     static bool opDispatch(string identifier)()
     {
         mixin("
             version(", identifier, ")
                 return true;
             else
                 return false;
         ");
     }
}


static if (Version.something == false)
{}
```

But i don't even use it since it requires me to import a module, 
it not worth it, i'd rather have version as expression