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J. Nick Koston
0651a905bc
The classic std::vector swap-with-copy idiom (vector<T>(other).swap(other)) instantiates the iterator-range copy constructor, which pulls in std::__throw_bad_array_new_length and the related typeinfo + vtable + dtor + what() method (~118 B of stdlib RTTI). Build into a temp via reserve + push_back instead, then move-assign: - reserve uses ::operator new (throws bad_alloc, already linked). - push_back without growth is the noexcept tail path. - move-assign just swaps pointers, no allocation. Same shrink semantics, saves ~128 B flash on ESP32. Also adds a fast-path early return for the case where capacity already equals size (common after a quiet period, since vector capacity only grows when crossing the doubling threshold).
