506.cpp

C++实训教程

//506.cpp demo 两种不同的传递参数法的调用开销时间
//using class FTimer

#include "ftimer.h"
class Book
{
	public:
		unsigned long No;
		Book(int n){No=n;};
		~Book(){};
};

void Add(Book b);
void AddRef(Book & b);

void main()
{
	Book B1(1),B2(1);
	FTimer t1,t2;
	unsigned long i;
	const  unsigned long COUNT = 10000000L;  //10M
	
	t1.Start(); // 获取计算前的开始时间
	for(i=0; i<COUNT; i++)Add(B1);
	t1.Stop(); // 获取计算后的结束时间
	
	t2.Start(); // 获取计算前的开始时间
	for(i=0;i<COUNT;i++)AddRef(B2);
	t2.Stop(); // 获取计算后的结束时间
	
	cout << "time pass objectccc is ";t1.DisplayDeltaTime();
	cout << "time pass Reference is ";t2.DisplayDeltaTime();
	return ;
}
void Add(Book b)// 普通参数传递
{b.No++;}

void AddRef(Book & b)// 引用参数传递
{b.No++; }

/*
time pass objectccc is 1210mS
time pass Reference is 160mS
*/