In some cases when a signal handler takes a RefPtr const&, it only ever needs to observe the object, so it would seem simpler to pass a normal const& reference. What's the normal reason for passing a RefPtr const&?
To me it would express 'This thing is reference counted, and you can add a reference if you want, but I'm not going to make you (i.e. waste an increment/decrement just for every call)'. However, this doesn't always seem to be the case, as in a number of handlers I've seen, there appears to be no reason that the callee would take a reference. Sorry if this is a silly question, but it popped into my head, so I thought I'd better write it down...
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