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From: John Torjo (john.lists_at_[hidden])
Date: 2005-05-21 23:09:19

> The scenario we use is something akin to the following (using macros):
> LOG(int level, string tag) << "whatever";
> The logging (as a whole) can be enabled/disabled. When enabled,
> portions (according to the 'tag') as well as the level, can be
> selectively enabled.

Besides levels, the rest is already in the existing lib.
> Levels and tags are automatically inserted into the stream (for
> post-filtering if desired).
> We generally have different logs/streams for different types of
> logging: errors, warnings, developer messages, determinism checks:
> ERROR_LOG(...) << ...;
> WARNING_LOG(...) << ...;
> etc.
Yup... Similar usage: BOOST_LOG(err), BOOST_LOG(warn), etc.

Of course, you can create your own macros, if you wish:
#define ERROR_LOG BOOST_LOG(err)

> Which of course can be tied (at runtime) to the same stream or
> different streams.


> There's always the push for "speed", so a compile-time disabling
> (akin to NDEBUG for asserts) of certain streams is required.

Already done, as suggested by Darren Cook.


John Torjo,    Contributing editor, C/C++ Users Journal
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