The author could compile c++ with the sanitizers, i.e. -fsanitize=address,undefined and make a make_appender function that leverages perfect forwarding...: t

The author could compile c++ with the sanitizers, i.e. -fsanitize=address,undefined and make a make_appender function that leverages perfect forwarding...: template<typename S> auto make_appender(S&& suffix) { return [perf_fwd_suffix = std::tuple{std::forward<S>(suffix)}](std::vector<int>&& items) { return append(std::move(items), std::get<0>(perf_fwd_suffix)); }; } see: https://godbolt.org/z/M9P4MK4a8 https://godbolt.org/z/M9P4MK4a8