boost::logging::scenario::usage Namespace Reference

If you want the library to choose the best logger/filter classes based on how your application will use the loggers and filters, use this namespace. More...

Classes
struct	use
	Finds a filter class and a logger class that fit your application's needs. More...
Namespaces
namespace	filter_
	Filter usage settings : filter_::change and filter_::level.
namespace	logger_
	Logger usage settings : logger_::change and logger_::favor.

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Detailed Description

If you want the library to choose the best logger/filter classes based on how your application will use the loggers and filters, use this namespace.

First, don't forget to

using namespace boost::logging::scenario::usage;

Then, you can specify the logger and filter, in a very easy manner

Example 1:

• Use a filter that uses per-thread caching with resync once at 10 secs,
• The filter uses levels
• Use a logger that will favor speed

using namespace boost::logging::scenario::usage;
typedef use< filter_::change::often<10>, filter_::level::use_levels, default_, logger_::favor::speed> finder;

BOOST_DECLARE_LOG_FILTER(g_log_filter, finder::filter);
BOOST_DECLARE_LOG(g_l, finder::logger) 
...

Example 2:

• Use a filter that is initialized only once, when multiple threads are running
• The filter does not use levels
• Use a logger that is initialized only once, when only one thread is running

using namespace boost::logging::scenario::usage;
typedef use< filter_::change::set_once_when_multiple_threads, filter_::level::no_levels, logger_::change::set_once_when_one_thread> finder;

BOOST_DECLARE_LOG_FILTER(g_log_filter, finder::filter);
BOOST_DECLARE_LOG(g_l, finder::logger) 
...

To see scenario::usage used in code:

• Click to see description of the example
• Click to see the code

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Copyright John Torjo © 2007
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