Logging

The utils/log.h header file provides logging functionality in the form of the LOG() macro:

...
LOG(INFO, "The value of x is ", x)
...

You can log any number of elements as an argument to LOG. Each of them must support printing to a stream (operator<<).

Note

All qiotoolkit classes which are derived from utils::Component have this capability.

Levels

Level	Description
DEBUG	Surfaced in Debug builds only.
INFO	Hidden in Release unless -v is specified.
WARN	Unexpected state with predefined recovery.
ERROR	Problematic state, continuation possible.
FATAL	Recovery not possible.

Debug builds will surface all log levels, while Release builds only show WARN level or higher (unless verbosity is set with -v). DEBUG logs are never shown in a Release build.