text: // Copyright (c) <2016>, <Nanyang Technological University> All rights reserved.
  
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  
  // 1. Redistributions of source code must retain the above copyright notice,
  // this list of conditions and the following disclaimer.
  
  // 2. Redistributions in binary form must reproduce the above copyright notice,
  // this list of conditions and the following disclaimer in the documentation
  // and/or other materials provided with the distribution.
  
  // 3. Neither the name of the copyright holder nor the names of its contributors
  // may be used to endorse or promote products derived from this software without
  // specific prior written permission.
  
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  // POSSIBILITY OF SUCH DAMAGE.
  
  #ifndef TIMER_H
  #define TIMER_H
  #include <stdio.h>
  #include <cstdlib>
  #include <ctime>
  #include <iostream>
  #include <string>
  #include <ctime>
  #include <chrono>
  using namespace std::chrono;
  
  namespace Jeffsan{
  
  class Timer
  {
  public:
  	Timer()
  	{
  		tic();
  	}
  
  	double end()
  	{
  		time_span = duration_cast<duration<double>> (high_resolution_clock::now() - start);
  		tic();
  		return time_span.count();
  	}
  
  	void tic()
  	{
  		start = high_resolution_clock::now();
  	}
  
  	void toc(std::string section = " ")
  	{
  		end();
  		printf("%s T: %g FPS: %gHz \r\n", section.c_str(), time_span.count(), 1/(time_span.count()));
  	}
  
  	void hz(std::string section = " ")
  	{
  		++num;
  		time_span = duration_cast<duration<double>> (high_resolution_clock::now() - start);
  
  		if (time_span.count() >= 1.0)
  		{
  			printf("%s: %f Hz\n", section.c_str(), double(num)/(time_span.count()));
  			num = 0;
  			tic();
  		}
  	}
  
  private:
  	high_resolution_clock::time_point start;
  	duration<double> time_span;
  	unsigned int num;
  };
  
  }
  #endif 
  