函数：使用函数模板，泛型引用，重载进行数据交换

#include <iostream>

template <typename T>
void Swap(T *a, T *b, int n);

template <typename T>
void Swap(T &a, T &b);

void Show(int a[]);
const int Lim = 8;

int main(void)
{
	using std::cout;
	
	int i=10, j=20;
	cout << "i,j = " << i << ", " << j << ".\n";
	cout << "Using compiler-generated int swapper:\n";
	Swap(i,j);
	cout << "Now i, j = " << i << ", " << j << ".\n";
	
	int d1[Lim]={0,7,0,4,1,7,7,6};
	int d2[Lim]={0,7,2,0,1,9,6,9};
	
	cout << "Original arrays:\n";
	Show(d1);
	Show(d2);
	Swap(d1,d2,Lim);
	cout << "Swapped arrays:\n";
	Show(d1);
	Show(d2);
	
	return 0;
}
template <typename T>
void Swap(T *a, T *b, int n)
{
	T temp;
	for(int i=0; i<n; i++)
	{
		temp=a[i];
		a[i]=b[i];
		b[i]=temp;
	}
}

template <typename T>
void Swap(T &a, T &b)
{
	T temp;
	temp = a;
	a = b;
	b = temp;
}

void Show(int a[])
{
	using std::cout;
	using std::endl;
	
	cout << a[0] << a[1] << "/";
	cout << a[2] << a[3] << "/";
	for(int i=4; i<Lim; i++)
		cout << a[i];
	cout << endl;
}