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;}