Structured logging (was Early review of std.logger)

[Dicebot]

On Tuesday, 15 October 2013 at 15:53:34 UTC, Robert Schadek wrote:
> That been said, you can add it. The method Logger.logf is a 
> variadic
> template. You can simple create your own Logger Class and 
> overwrite that
> method and implemented your structured logging approach there. 
> The only
> pitfall is that you need a ref of type 
> WhateverYourLoggerClassIsCalled
> and call logf on that or you fall back to the default logf
> implementation provided by the Logger class. Another way would 
> be to
> parse the message passed to logMessage and go from there.
>
> Long story short. Global default Logger means structured logging
> requires parsing. All other logger require correct reference 
> type of logger.

I don't think it is a good design to conflate logging mode with 
output mode in a single logger class. I'd prefer to see log() as 
variadic structured logger and logf() as it is now (making 
conditional logger `logIf()`)