LOG Macro

Table of Contents

• LOG condition (when the log is enabled)
• Severity Level
• LOG Only
• Trace

LOG is a macro help you to LOG structured data into a file and record the meta data about it (FILE, LINE, FUNCTION and LOG messages).

All the data that put in LOG should be on disk and saved.

LOG condition (when the log is enabled)

• INFO_IF()
• INFO_EVERY_()
• INFO_IF_EVERY_()
• INFO_FIRST()
• INFO_FIRST_()

Severity Level

There 5 levels of log information: INFO, LOG, WARNING, ERROR, and FATAL.

The INFO level will discard the information if there is no other LOG, WARNING, ERROR, and FATAL happens in the context.

Note: LOG FATAL will cause the program terminate

LOG Only

Log only on a function, or on a file, or on a module

Trace

You can use info to get some information and later use LOG macro to record them.