Using glog's design for Phobos?

[Andrei Alexandrescu]

On 8/27/10 6:49 PDT, Steven Schveighoffer wrote:
> On Thu, 26 Aug 2010 18:19:24 -0400, Tomek Sowiński <just at ask.me> wrote:
>
>> Dnia 26-08-2010 o 05:59:19 Andrei Alexandrescu
>> <SeeWebsiteForEmail at erdani.org> napisał(a):
>>
>>> At my workplace we're using Google's logging library glog
>>> (http://google-glog.googlecode.com/svn/trunk/doc/glog.html), and the
>>> more I use it, the more I like it. It's simple, to the point, and
>>> effective.
>>>
>>> I was thinking it would be great to adapt a similar design into
>>> Phobos. There will be differences such as use of regular argument
>>> lists instead of << etc., but the spirit will be similar. What do you
>>> think?
>>
>> Hm.. why not. Some quick thoughts:
>>
>> * Only a subset of features needs to be ported, e.g.
>> DLOG(...) == version(debug) LOG(...)
>> CHECK == enforce()
>> Also, I don't get the superlativeness of LOG_IF(INFO, pred) << ...
>> versus if (pred) LOG(INFO) << ...
>
> I think I know why, without even looking at the code. A typical issue
> with logging is that you want to evaluate the log output level, which is
> always an O(1) operation, before evaluating any other items which may be
> expensive, such as a custom predicate or message.

That, plus the ability to disable logging altogether statically.

Andrei