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J. Nick Koston
69d3f563d5
Replace std::vector<Callback<void(Ts...)>> with a minimal container
that exploits Callback's trivially-copyable nature. Since Callback is
just {fn_ptr, ctx_ptr}, reallocation is a plain __builtin_memcpy
instead of std::vector's exception-safe move/copy machinery.
Uses uint16_t for size/capacity (8 bytes on 32-bit vs 12 for
std::vector), and grows to exact size since callbacks are registered
during setup() and most instances have 0-1 callbacks.
Eliminates _M_realloc_insert/_M_default_append template instantiations
per callback signature type.
