135.异常与类继承

#include <iostream>
using namespace std;

//如果产生继承,子类的对象也可以被父类捕获.因为子类内部包含父类对象
class outerror
{
public:
};

class newerror:public outerror
{
public:
};

class myclass
{
private:
    int *p;
    int n;

public:
    myclass() :p(nullptr), n(0)
    {
        
    }

    myclass(int i) 
    {
        if (i <= 0)
        {
            throw newerror();
        }

        p = new int[i];
        for (int j = 0; j < i; j++)
        {
            p[j] = j;
        }
    }

    int operator[](int num)
    {
        if (num < 0)
        {
            throw newerror();
        }

        if (num < 0 || num >= n - 1 || p == nullptr)
        {
            throw newerror();
        }

        if (p == nullptr)
        {
            throw newerror();
        }
        return p[num];
    }
};

void main()
{
    try
    {
        myclass my1(1);
        cout << my1[4];
    }
    catch (outerror e)
    {
        cout << "outerror e" << endl;
    }
    catch (newerror e)
    {
        cout << "newerror e" << endl;
    }
    
    

    cin.get();
}