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| static void  | setLevel (Level level) | 
|   | Set a global severity level.  More...
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| static void  | debug (const char *fmt,...) | 
|   | Print a debug message.  More...
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| static void  | info (const char *fmt,...) | 
|   | Print an info message.  More...
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| static void  | warning (const char *fmt,...) | 
|   | Print a warning message.  More...
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| static void  | error (const char *fmt,...) | 
|   | Print an error message.  More...
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| static void  | fatal (const char *fmt,...) | 
|   | Print a fatal message and quit.  More...
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Logging functions. 
Logging functions are used to report some events that have happened in the system. These functions print messages to the standard error. It uses printf-like format strings.
A message is associated to a severity level. The severity level indicates the severity of the message and range from a simple debug message to a fatal message.
You can set the minimum severity for which messages are displayed. By default, the minimum severity level is gf::Log::Warning (or gf::Log::Debug if debug mode is activated at build time).
Example: