Log levels

Classes
struct	senf::log::VERBOSE
	Log level VERBOSE. More...
struct	senf::log::NOTICE
	Log level NOTICE. More...
struct	senf::log::MESSAGE
	Log level MESSAGE. More...
struct	senf::log::IMPORTANT
	Log level IMPORTANT. More...
struct	senf::log::CRITICAL
	Log level CRITICAL. More...
struct	senf::log::FATAL
	Log level FATAL. More...
struct	senf::log::DISABLED
	Disable logging. More...
struct	senf::log::NONE
	Inherit log level. More...

Detailed Description

These are the valid log levels with some additional special values:

VERBOSE

Really verbose log messages. Messages at this level are used for internal debugging. They should be enabled only selectively within the areas currently under inspection. The default log stream senf::log::Debug has these messages disabled at compile time by default. To enable them, see Configuration.

NOTICE

Arbitrary unimportant notice. Message which normally should be disabled but might be informative to better understand the programs operation.

MESSAGE

Purely informative message which should be displayed if not explicitly disabled.

IMPORTANT

Important information or warning which really should be read.

CRITICAL

Error condition which does not terminate the program completely but has non-reversible adverse effects

FATAL

Error condition which does terminate program execution or enforces a restart or some kind of re-initialization with loss of state and context.

There are also some special values which must not be used as a log level:

DISABLED

Disable all log messages.

NONE

Special value which signifies inheritance of the default log level.

Log levels are classes, not numbers. Each log level class has a value member which gives that levels numeric priority. The larger the number, the more important the message is.

Implementation note:

The log levels need to be classes since areas and streams are classes: Since log arguments (stream, area and level) may appear in any order and number, it is much simpler to parse them if they are all of the same type.