ExecutionTimer.h

// ExecutionTimer.h
// original code by Code Blacksmith on Youtube
// https://www.youtube.com/watch?v=GV0JMHOpoEw
// This code cleverly and accurately times execution simply 
// by it's construction and destruction. It's easy to use on any
// segment of code by simply wrapping the code in braces to control 
// it's lifetime scope.
// For example, you want to time the call to GetData() in this code:
//
//  DoSomething();
//  GetData();
//  DoSomethingElse();
//
// Simply change it to:
// 
//  DoSomething();
//  {
//    ExecutionTimer t;
//    GetData();
//  }
//  DoSomethingElse();
// 

#pragma once

#include "stdafx.h"  // remove if not needed
#include <algorithm>
#include <iostream>
#include <vector>
#include <chrono>
using namespace std::chrono;

class ExecutionTimer
{
public:
	// Use the best steady clock available
	using Clock = std::conditional_t<high_resolution_clock::is_steady,
		high_resolution_clock,
		steady_clock>;

	ExecutionTimer() = default;
	inline ~ExecutionTimer()
	{
		std::string units = " microSeconds";
		// Determine whether to print uSecs or mSecs or Secs
		double count = duration_cast<microseconds>(Clock::now() - mStart).count();
		if (count > 1000)
		{
			// Convert to milliseconds
			units = " milliSeconds";
			count /= 1000.0f;
			if (count > 1000)
			{
				// Convert to seconds
				units = " Seconds";
				count /= 1000.0f;
			}
		}

		std::cout
			<< "Elapsed: " << count << units.data() << std::endl;
	}
private:
	Clock::time_point mStart = Clock::now();
};