Logging inside struct?

[Simen Kjærås]

On Wednesday, 30 May 2018 at 09:58:16 UTC, biocyberman wrote:
> How do I add logging for this struct?
>
> https://run.dlang.io/is/9N6N4o
>
> If not possible, what's the alternative?

This line:

     writeln("got num: %s, of type: %s", num, typeof(num));

Gives this error message:

     onlineapp.d(7): Error: cannot pass type int as a function 
argument

The error message says exactly what's wrong - you can't pass a 
type as a runtime argument. You can get a string representation 
using .stringof:

     writeln("got num: %s, of type: %s", num, 
typeof(num).stringof);

Next up: if prints this:

     got num: %s, of type: %s1int
     1

You probably want something more like this:

     got num: 1, of type: int
     1

The problem is you're using writeln, which only dumps its 
arguments to stdout in the order they're passed. writefln does 
formatting using %s:

     writefln("got num: %s, of type: %s", num, 
typeof(num).stringof);

--
   Simen