chapter2-36.cpp

C++STL程序员开发指南

//文件名：CHAPTER2-36.cpp
#include<iostream.h>
class Err
{
    int err_number;
public:
		Err(int x):err_number(x) {cout<<"A error array ID number has been found."<<endl;}
	int get_err_number(){return err_number;}
};
template<class T>
class Array
{
    int i;
T *ar;
public:
	   Array(int c):i(c){ar=new T[c];}
	   void init(int n,T x){ar[n]=x;}
	   T& operator[](int n) {if(n>=i)throw Err(n);return ar[n];}
};
void main()
{
  Array<int> array(5);
  cout<<"Please input every element's value:"<<endl;
  try{
       for(int i=0;i<5;i++) { cout<<"No."<<i+1<<':';cin>>array[i];}
	      cout<<array[5];  //测试数组越界从而导致异常处理的产生
   }
  catch(Err& ex) {cout<<"This value is "<<ex.get_err_number()<<endl;}
}