10.5 의존관계 Dependencies

#include <iostream>
#include <vector>
#include <algorithm>
#include <random>
#include <chrono>

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();
        
        std::cout << std::chrono::duration_cast<second_t>(end_time - start_time).count() << "\n";
    }
};

//#include "Timer.h"

class Worker
{
public:
    void doSomething();
};

#include "Worker.h"
#include "Timer.h" // cpp파일에만 있으면 된다.
 
void Worker::doSomething()
{
    Timer timer;

    timer.elapsed();
}

#include "Worker.h"

using namespace std;

int main()
{
    Worker().doSomething();
    
    return 0;
}