Recommended way to use __FILE__/__LINE__ etc.

[Mathias LANG]

On Thursday, 22 October 2020 at 16:03:45 UTC, H. S. Teoh wrote:
> On Thu, Oct 22, 2020 at 03:32:57PM +0000, Andrey Zherikov via 
> Digitalmars-d-learn wrote:
>> There are two ways how __FILE__, __LINE__ etc. can se used in 
>> function parameters: as regular parameters and as template 
>> parameters:
> [...]
>> What is recommended way?
>> What are pros/cons of each case?
>
> I don't know what's the "recommended" way, but generally, I 
> prefer to pass them as regular parameters. Otherwise you will 
> get a lot of template bloat: one instantiation per file/line 
> combination.
>
> However, sometimes there is not much choice: if your function 
> is variadic, then you pretty much have to use template 
> parameters, 'cos otherwise you won't be able to pick up the 
> __FILE__/__LINE__ of the caller with default arguments.
>
>
> T

You will. This is possible since v2.079.0 (March 2018): 
https://dlang.org/changelog/2.079.0.html#default_after_variadic
So yeah, always pass them as function parameters to avoid bloat.