134.异常类的处理

异常类

 1 #pragma once
 2 #include <initializer_list>
 3 using namespace std;
 4 
 5 class memerror
 6 {
 7 };
 8 
 9 class outerror
10 {
11 };
12 
13 class safeintarray
14 {
15 private:
16     int *p;
17     int n;
18 
19 public:
20     safeintarray(int length);
21     safeintarray(initializer_list<int> mylist);
22     safeintarray();
23     int &operator [](int num);
24     ~safeintarray();
25 };

 1 #include "safeintarray.h"
 2 
 3 
 4 
 5 safeintarray::safeintarray(int length)
 6 {
 7     if (length <= 0)
 8     {
 9         throw memerror();
10     }
11     this->p = new int[length] {0};
12     this->n = length;
13 }
14 
15 safeintarray::safeintarray(initializer_list<int> mylist)
16 {
17 }
18 
19 safeintarray::safeintarray()
20 {
21 }
22 
23 int & safeintarray::operator[] (int num)
24 {
25     // TODO: 在此处插入 return 语句
26     if (num<0 || num>this->n - 1)
27     {
28         throw outerror();
29     }
30 
31     return this->p[num];
32 }
33 
34 
35 safeintarray::~safeintarray()
36 {
37 }

main.cpp

 1 #include <iostream>
 2 #include "safeintarray.h"
 3 using namespace std;
 4 
 5 void main()
 6 {
 7     try
 8     {
 9         safeintarray s1(5);
10 
11         cout << s1[5] << endl;
12     }
13     catch(outerror e)
14     {
15         cout << "内存分配错误" << endl;
16     }
17     catch (memerror e)
18     {
19         cout << "越界" << endl;
20     }
21 
22     cin.get();
23 }