C++ 의존 관계 (Dependency)

의존 관계 (Dependency)

• Worker 클래스에서 잠깐 사용하는 Timer 클래스

  main.cpp

  #include "Timer.h"
  #include "Worker.h"
  
  int        main()
  {
    Worker().doSomething();
  }
  
  /* stdout
  4e-07
  */

  Timer.h

  #pragma once
  #include <iostream>
  #include <chrono>
  
  using namespace std;
  
  class Timer
  {
      using clock_t = std::chrono::high_resolution_clock;
      using second_t = std::chrono::duration<double, std::ratio<1>>;
  
      std::chrono::time_point<clock_t> start_time = clock_t::now();
  
  public:
      void elapsed()
      {
          std::chrono::time_point<clock_t> end_time = clock_t::now();
  
          cout << std::chrono::duration_cast<second_t>(end_time - start_time).count() << endl;
      }
  };

  Worker.h

  #pragma once
  
  class Worker
  {
  public:
    void    doSomething();
  };

  Worker.cpp

  #include "Worker.h"
  #include "Timer.h"
  
  void    Worker::doSomething()
  {
    Timer timer;
  
    // do some work here
  
    timer.elapsed();
  }