Voting: std.logger

[Andrei Alexandrescu via Digitalmars-d]

On 8/1/14, 8:52 AM, Martin Nowak wrote:
> On 08/01/2014 04:31 AM, Andrei Alexandrescu wrote:
>> On 7/31/14, 7:19 PM, Martin Nowak wrote:
>>> You cannot use version identifiers to selectively disable functionality
>>> or people would have to compile their own phobos library for every set
>>> of version combinations.
>>
>> Wait, doesn't code work with the version chosen by the user? -- Andrei
>>
>
> Well phobos as a library is precompiled, so the versions used to compile
> phobos will be relevant, not the ones in client code.
>
> For templated functions version identifier will "leak" from client code
> into the library, because technically they are instantiated by the
> client code.
>
> Also the version identifiers of client code determine which declarations
> you see.
>
> Relying on this would be a constant source of bugs.
>
> I did proof-of-concept yesterday using type tags and template
> constraints to statically disable certain log levels.
> It also has some drawbacks because LogLevel is no longer a plain enum,
> but it's more appropriate than version identifiers.
> http://forum.dlang.org/post/lrf362$tkn$1@digitalmars.com

Oh I hadn't realized that. Thanks! That strengthens my opinion that more 
work is needed on the library before inclusion in std.experimental. -- 
Andrei