Running Time Measurement (C++)

#include <chrono>  
#define TIMING  

#ifdef TIMING  
#define INIT_TIMER auto start = std::chrono::high_resolution_clock::now();  
#define START_TIMER  start = std::chrono::high_resolution_clock::now();  
#define STOP_TIMER(name)  std::cout << "RUNTIME of " << name << ": " << \  
    std::chrono::duration_cast<std::chrono::milliseconds>( \
            std::chrono::high_resolution_clock::now()-start \
    ).count() << " ms " << std::endl; 
#else  
#define INIT_TIMER  
#define START_TIMER  
#define STOP_TIMER(name)  
#endif