chrono.cpp

int main(){
    std::ratio<1, 10> r; //1/10
    cout << r.num << "/" << r.den <<endl; 
    //ALl clock frequency is represented by a ratio, we can print the 
    //ratio using the similar approach.
    cout << chrono::system_clock::period::num <<"/" <<chrono::steady_clock::period::den <<endl;
    
    //duration:
    chrono::microseconds mi(2700);//2700 microseconds!
    mi.count(); //get the value 2700 here
    //2700000 nanoseconds. The coverssion works fine here for we are converting
    //low resolution to high resolution
    chrono::nanoseconds na = mi; 
    na.count(); //get the value 2700000 here
    //We need to do the cast here if we want to convert high resolution
    //to low resolution. 2 milliseconds, the value is truncated.
    chrono::milliseconds mill = chrono::duration_cast<chrono::milliseconds>(mi);
    
    mi = mill + mi; //4700

    //Time point//
    //current time of system clock
    chrono::system_clock::time_point tp = chrono::system_clock::now();
    cout << tp.time_since_epoch().count() << endl;

    tp = tp + chrono::seconds(2);
    cout << tp.time_since_epoch().count() << endl;

    //Measure the time span
    chrono::steady_clock::time_point start = chrono::steady_clock::now();
    cout <<"I am bored!!!" <<endl;
    chrono::steady_clock::time_point end = chrono::steady_clock::now();
    chrono::steady_clock::duration d = end - start;
    if(d == chrono::steady_clock::duration::zero()){
        cout << "No time elapsed!" <<endl;
    }
    cout << chrono::duration_cast<chrono::microseconds>(d).count() <<endl;
    
    system("pause");
    return 0;
}