room.hpp

#pragma once

#include <functional>
#include <memory>
#include <mutex>

template<class T>
class room {
public:
  typedef std::shared_ptr<T> ptr;
  
private:
  ptr value;
  std::mutex mtx;

public:
  room(ptr v)
  : value(v)
  {}

  room(T* v)
  : value(v)
  {}

  void use(std::function<void(ptr)> f) {
    std::lock_guard<std::mutex> lock(mtx);
    f(value);
  }
};