[LOGCXX-515] Add macros to utilize libfmt formatting for messages

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.12.0
• Assignee: Robert Middleton
• Reporter: Robert Middleton
• Created: 29/Dec/20 23:14
• Updated: 23/Mar/21 01:11
• Resolved: 23/Mar/21 01:11

Description

Create macros that use fmt::format to create the log message.

 

The prototype looks like this:

#define LOG4CXX_INFO_FMT(logger, ...) do { \
		if (logger->isInfoEnabled()) {\
			logger->forcedLog(::log4cxx::Level::getInfo(), fmt::format( __VA_ARGS__ ), LOG4CXX_LOCATION); }} while (0)

Usage:

LOG4CXX_INFO_FMT( logger, "This is a message that has some kind of {} information in it", "useful" );

This is slightly faster at runtime than using the MessageBuffer class with operator<< all the time, and much clearer.  Conveniently, the coloring provided by libfmt also shows up on the output.

 

is there a better name than LOG4CXX_INFO_FMT?