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When can the C++ compiler devirtualize a call?
Someone recently asked me about devirtualization optimizations: when do they happen? when can we rely on devirtualization? do different compilers do devirtualization differently? As usual, this led me down an experimental rabbit-hole. The answer seems to be: Modern compilers devirtualize calls to final methods pretty reliably. But there are many interesting corner cases — including some I haven’t thought of, I’m sure! — and different compilers do catch different subsets of those corner cases.
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