#include <iostream>
#include <windows.h>
//#include "tests.h"


//5 million times !
#define BIG_TESTS 5000000



#include <string>

using namespace std;

//a new copy is created - so original string is not changed
void String1(string str)
{
	str = "changed";
}

//a reference is used
void String2(string& str)
{
	str = "changed";

}


void String3(string* str)
{
	*str = "changed";
}


//char* changed by pointer simple printf
void String4(char* str)
{

	sprintf(str,"changed");

}

//direct strcpy
void String5(char* str)
{
	strcpy(str, "changed");
}





LARGE_INTEGER before;
LARGE_INTEGER difference;
LARGE_INTEGER curtime;
LARGE_INTEGER freq;
unsigned long timepassed;
unsigned int fps;




//Calculate time passed
void TimePassed()
{
	

	
	QueryPerformanceFrequency( &freq);
	
	double TimeScale = (1.0/freq.QuadPart)*1000.0;
	
	
	//Add the function in here
	
	QueryPerformanceCounter( &curtime);//end measure

	timepassed = (curtime.QuadPart-before.QuadPart)*TimeScale;


	QueryPerformanceCounter( &before);//begin measure

}



int main()
{
	cout << " Starting test. Number of loops= "<< BIG_TESTS  << endl << endl;

    //get cur time
	QueryPerformanceCounter(&before);
	QueryPerformanceCounter(&curtime);

	string temp = "testing";

	char temp2[50];
	sprintf(temp2,"testing");


	// Regular function with copy
	cout << "1 - (string str)"<< endl;
	TimePassed();

	for(int i = 0; i < BIG_TESTS; i++)
	{
		String1(temp);
	}

	TimePassed();
	cout << " -- passed "<< timepassed << " ms" << endl;



	//function with a referense to string
	cout << "2 - (string& str)"<< endl;
	TimePassed();

	for(int i = 0; i < BIG_TESTS; i++)
	{
		String2(temp);
	}

	TimePassed();
	cout << " -- passed "<< timepassed << " ms" << endl;



    // function with a pointer to string
	cout << "3 - (string* str)"<< endl;
	TimePassed(); 

	for(int i = 0; i < BIG_TESTS; i++)
	{
		String3(&temp);
	}

	TimePassed();
	cout << " -- passed "<< timepassed << " ms" << endl;



	//function with a pointer to char
	cout << "4 - (char* str)"<< endl;
	TimePassed(); 

	for(int i = 0; i < BIG_TESTS; i++)
	{
		String4(temp2);
	}

	TimePassed();
	cout << " -- passed "<< timepassed << " ms" << endl;


	//function with a pointer to char using strcpy
	cout << "5 - strcpy (char* str)"<< endl;
	TimePassed(); 

	for(int i = 0; i < BIG_TESTS; i++)
	{
		String5(temp2);
	}

	TimePassed();
	cout << " -- passed "<< timepassed << " ms" << endl;

	int a;
	cin >> a;
	return 0;
}

VS 8--------------------------------------------------* Multithreaded DLL Starting test. Number of loops= 50000001 - (string str) -- passed 837.778 ms2 - (string& str) -- passed 333.692 ms3 - (string* str) -- passed 326.002 ms4 - (char* str) -- passed 1576.6 ms5 - strcpy (char* str) -- passed 7.51576 ms*Multithreaded Starting test. Number of loops= 50000001 - (string str) -- passed 366.745 ms2 - (string& str) -- passed 182.604 ms3 - (string* str) -- passed 187.33 ms4 - (char* str) -- passed 1620.86 ms5 - strcpy (char* str) -- passed 5.05036 msVS 7--------------------------------------------------*Singlethreaded Starting test. Number of loops= 50000001 - (string str) -- passed 329.72 ms2 - (string& str) -- passed 149.223 ms3 - (string* str) -- passed 157.478 ms4 - (char* str) -- passed 1000.62 ms5 - strcpy (char* str) -- passed 5.03248 ms *Multithreaded Starting test. Number of loops= 50000001 - (string str) -- passed 349.87 ms2 - (string& str) -- passed 198.168 ms3 - (string* str) -- passed 159.792 ms4 - (char* str) -- passed 734.929 ms5 - strcpy (char* str) -- passed 5.14032 ms *Multithreaded DLL Starting test. Number of loops= 50000001 - (string str) -- passed 572.189 ms2 - (string& str) -- passed 283.535 ms3 - (string* str) -- passed 274.563 ms4 - (char* str) -- passed 739.255 ms5 - strcpy (char* str) -- passed 5.00734 ms

	mov	ecx, DWORD PTR ??_C@_07HADGPIEN@changed?$AA@+4	mov	edx, DWORD PTR ??_C@_07HADGPIEN@changed?$AA@	mov	eax, 5000000				; 004c4b40H$LL3@main:; 159  : ; 160  : 	for(int i = 0; i < BIG_TESTS; i++)	sub	eax, 1; 161  : 	{; 162  : 		String5(temp2);	mov	DWORD PTR _temp2$[esp+256], edx	mov	DWORD PTR _temp2$[esp+260], ecx	jne	SHORT $LL3@main; 163  : 	}; 164  :