Is there a way to do the same thing in entry and return of a bunch of functions?

[Nicholas Wilson]

On Tuesday, 17 September 2019 at 17:11:09 UTC, Stefanos Baziotis 
wrote:
> I think it's better to give a concrete example rather than 
> explaining this vaguely.
>
> -- The question --
> Can we do better ? For one, I believe that because D does not 
> have a preprocessor,
> we have to do an actual declaration which would be somewhat 
> more verbose.
> Or do a mixin that does it. mixin can help as it can be more 
> complicated
> and also we can access local scope (although I don't think this 
> is a good idea).
>
> But in both cases, they're not totally invisible.
>
> Can we do something like: func1, func2 and func3, when they 
> enter do the X
> and when they return, they do the Y.
>
> Thanks,
> Stefanos

I think a mixin that does

string LOG_SCOPE = q{
callDepth++;
scope(exit) callDepth--;
}

is probably the easiest. for bonus points

string LOG_SCOPE = q{
callDepth++;
debug_log(__FUNCTION__);// or __PRETTY_FUNTION__
scope(exit) callDepth--;
}

and the mixin(LOG_SCOPE);

I mean you _could_ do some UDA reflection to generate wrapping 
function that do the indentation, bit that is overkill.