------- Comment #3 from lloyd at randombit dot net 2007-06-27 19:06 ------- "I haven't seen such code written in the first place ever."
Neither had I, until I found out it is endemic in a large project at work. I'd just as soon write a script to find these cases, but figuring out what the type of the casted-from pointer/reference is can be somewhat nontrivial. "Warnings are for cases where either code may not do what you expect, or where a certain way of coding has a significant cost that can be avoided." I think that's a good definition. My impression is that dynamic_cast is fairly expensive, and while it is great that GCC noops out this case I suspect not all compilers will do the same; at this point I'm not even sure that GCC does it consistently. So I'd figure it a reasonable case for a warning as per your second condition. "I doubt anyone will ever implement this." I've gotten used to that. :) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32525
