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我的问题在于代码:

template<typename... Ts>
struct TupleOfVectors {
  std::tuple<std::vector<Ts>...> tuple;

  void do_something_to_each_vec() {
    //Question: I want to do this:
    //  "for each (N)": do_something_to_vec<N>()
    //How?
  }

  template<size_t N>
  void do_something_to_vec() {
    auto &vec = std::get<N>(tuple);
    //do something to vec
  }
};