I'm not usually a fan of putting semantics in comments, but here I think I might make an exception for:
if(&predicate(...)) {
&foo(...);
} else {
# do nothing
}
It's a bit more explicit to some poor maintenance programmer than a lone, apparently useless, semi. Of course, if lone, apparently useless, semis are a coding convention for "do nothing" where you hack, it's okay. :-)
--
Yours in pedantry,
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"Anything you put in comments is not tested and easily goes out of date." -- tye
