Implementing std.log

[Denis Koroskin]

On Thu, 21 Apr 2011 01:34:29 +0400, so <so at so.com> wrote:

>> For me, Logger needs to be simple but feature complete. Here is my  
>> ideal syntax:
>>
>> Logger log = new Logger();
>> log.warn("bewarned");
>> log.error("error code: %d", 42);
>> log.fatal("Derp");
>
> Fine if you remove the first line, switching the output is something we  
> rarely do, so we shouldn't mandate this for each use.
>
> note("just a note :", 5);
> note!warn("bewarned");
> note!error(c, ", ", d);

Having different loggers for different parts of programs (e.g. separate  
logger for my rendering, separate one for audio, separate for physics, and  
so on) is a must for me.
Because when you debug your code by analyzing log output, you want to be  
able to filter out non-relevant stuff. If you only have ONE logger, you  
will start adding stupid prefixes like this:

error("GAME/GAMEMODE_CHALLENGE/OBJECTIVE_CHECKER: match data frame is not  
valid");

instead of

log.error("match data frame is not valid");