Several uses (some may have been mentioned already..)
- Logging:
DEBUG(....), this is neat because the contents are only evaluated if the logging is active (so the macro could have a test for log level for example...) You cannot replace this with an inline function as the arguments will always be evaluated. However with c++11, there is a lambda trick which will avoid the evaluation, however the syntnax is cludgy so you'll end requiring a macro anyway to clean it up! :)
- Code generation, I use lots of SFINAE tests, and it's easy to generate the test with a couple of macros rather than hand construct the test every time.
