『C++』Temp_2018_12_26

 #include <iostream>
 #include <string>
 #include <array>
 using namespace std;

 class Object{
 public:
     virtual void ToString(){
         cout<<"Object"<<endl;
     }

 public:
     virtual int GetPtrLength(){
         return sizeof(this);
     }
 };

 class Test : public Object{
 public:
     void ToString(){
         cout<<"Test"<<endl;
     }
 };

 class Ptr{
 public:
     char Bytes[];
 };

 class Int32{
 public:
     int m_Value;
 public:
     int GetPtrLength(){
         return sizeof(Int32);
     }
 };

 template <class T>
 class List{
 public:
     List() {         m_Count=;         m_Array = new char*[];     }
     ~List(){         if(m_Array!=NULL) {  delete[] m_Array;  cout<< "释放数组指针"<<endl; }
     }

 private:
     int m_Count;
     char** m_Array;

 public:
     void Add(T* item){
         ((Object**)m_Array)[m_Count]=(Object*)item;
         m_Count++;
     }
     Object* operator[](int i)
     {
         if(i >= m_Count)
             throw "索引超过最大值";
         return ((Object**)m_Array)[i];
     }

 };

 int main(){
     try{
         ////初始化一个 指针数组
         //Object** aaaa =NULL;
         //aaaa = new Object*[1000];
         //aaaa[0]=new Object();

         //cout<< sizeof(Ptr)<<endl;
         //cout<<*(new int(1000000))<<endl;

         //char bytes[20];
         //int* v0 = (bytes[0]);
         //bytes[0] = *(new int(1000000));
         //bytes[4] = *(new int(2000000));
         //for(int i=0;i<20;i++)
         //    cout<< bytes[i];
         //cout<<endl;

         //cin.get();
         //return  0;

         List<Object> list;
         list.Add(new Object());
         list.Add(new Test());
         auto ptr = list[];
         ptr->ToString();   //Test
         //delete list;

         List<int> list2;
         list2.Add(new int());
         list2.Add(new int());
         auto ptr2 = list2[];
         ptr2->ToString();  //崩溃

     }catch(char* str){
         cout<< str << endl;
     }catch(...){
         cout<<"未知异常"<<endl;
     }

     cin.get();
     return ;
 }

执行结果

 Test
 程序崩溃