How do you put log calls in constructors when they may be created in a static context?

[Timoses]

On Wednesday, 8 August 2018 at 21:54:34 UTC, aliak wrote:
> I'm trying to debug stuff, so I want to add verbose logging
>
> struct S(T) {
>   this() {
>     writeln("created S(T) with properties and ID");
>   }
> }
>
> static a = S!int(); // bah
>
> I guess users can call this code from any context, but when i'd 
> also like to see the log output for debugging purposes. Is 
> there a way around this?
>
> Can I maybe only do a writeln in a non compile-time context?
>
> Cheers,
> - ali

How about debug [1]?

struct S()T {
     this() {
         debug { writeln("Created..."); }
     }
}

and compile with the debug flag. You can also specify a debug 
identifier or level.

[1]: https://dlang.org/spec/version.html#debug