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J. Nick Koston
8010386614
GCC's std::function::operator=(function&&) implements move-assignment as a swap dance: construct temporary, swap with *this, destroy temporary. This generates two std::swap<_Any_data> calls plus a destructor even when the target is known to be empty. Since scheduler items returned from the pool or freshly allocated always have an empty callback, we can use explicit destroy + placement move-construct to bypass the swap overhead. Measured savings in set_timer_common_: - ESP8266 (Xtensa LX106): 473 → 421 bytes (-52 B, -11%) - ESP32-S3 (Xtensa LX7): 412 → 376 bytes (-36 B, -9%)
