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J. Nick Koston
30d7834fa8
When only one API protocol is configured (plaintext-only or noise-only), use the concrete frame helper type in unique_ptr instead of the base class. Since both APIPlaintextFrameHelper and APINoiseFrameHelper are marked final, the compiler can devirtualize all virtual calls (read_packet, write_protobuf_packet, loop, etc.), eliminating vtable dispatch overhead in the hot APIConnection::loop() path. When both protocols are enabled (encryption key set with plaintext fallback), the polymorphic base pointer is used as before.
