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net_cl_msg_cb_map.emplace(msg_id, std::forward<NET_MSG_FUNCTOR>(cb));
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NET_MSG_FUNCTOR&& cb
, а метод std::move - этоtemplate <class _Ty>
_NODISCARD constexpr remove_reference_t<_Ty>&& move(_Ty&& _Arg) noexcept { // forward _Arg as movable
return static_cast<remove_reference_t<_Ty>&&>(_Arg);
}
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