#include <utility>
#include <iostream>
#include <exception>

template <typename Functor>
class Defer {
 public:
  Defer(Functor&& functor) : functor_(std::forward<Functor>(functor)) {}
  Defer(const Defer&) = delete;
  Defer(Defer&&) = delete;

  ~Defer() {
    try {
      functor_();
    } catch (...) {
      std::cerr << "DO NOT throw exception in defer function" << std::endl;
      std::terminate();
    }
  }
 private:
  Functor functor_;
};

template <typename Functor>
Defer<Functor> make_defer(Functor&& functor) {
  return Defer<Functor>(std::forward<Functor>(functor));
}