dlib C++ Library - time_this.h

// Copyright (C) 2003 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_TIME_THIs_
#define DLIB_TIME_THIs_
#include <chrono>
// ----------------------------------------------------------------------------------------
#define TIME_THIS_TO(_tt_op,_tt_out) \
 { \
 auto _tt_start = std::chrono::high_resolution_clock::now(); \
 {_tt_op;} \
 auto _tt_stop = std::chrono::high_resolution_clock::now(); \
 auto _tt_thetime = _tt_stop-_tt_start; \
 using std::chrono::duration_cast; \
 using std::chrono::duration; \
 if (_tt_thetime >= std::chrono::minutes(1)) \
 _tt_out << "\ntime: " << duration_cast<duration<double,std::ratio<60>>>(_tt_thetime).count() << "min\n"; \
 else if (_tt_thetime >= std::chrono::seconds(1)) \
 _tt_out << "\ntime: " << duration_cast<duration<double>>(_tt_thetime).count() << "sec\n"; \
 else if (_tt_thetime >= std::chrono::milliseconds(1)) \
 _tt_out << "\ntime: " << duration_cast<duration<double,std::milli>>(_tt_thetime).count() << "ms\n"; \
 else if (_tt_thetime >= std::chrono::microseconds(1)) \
 _tt_out << "\ntime: " << duration_cast<duration<double,std::micro>>(_tt_thetime).count() << "us\n"; \
 else \
 _tt_out << "\ntime: " << duration_cast<duration<double,std::nano>>(_tt_thetime).count() << "ns\n"; \
 }
#define TIME_THIS(_tt_op) TIME_THIS_TO(_tt_op,std::cout)
// ----------------------------------------------------------------------------------------
#endif // DLIB_TIME_THIs_