CONFIG::debug {
	// do something if debugging
/*
}
	// do something else in production
	if (true) {
//*/
}

What the above code snippet is trying to achieve is run some code if CONFIG::debug is true and some other code if it’s false. It doesn’t work because the compiler first strips all the comments out and then looks for -define’d constants.

However, you can do this:

if (CONFIG::debug) {
	// do something if debugging
}
else {
	// do something else in production
}