Can you create a std::map of inherited classes?

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醉梦人生 2021-01-14 12:14

I\'m wondering if it\'s possible to create a map of pointers of inherited classes. Here\'s an example of what I\'m trying to do:

#include 
#inc


      
      
        
          4条回答        

        
                    
            
            
                         
                
              
              
                
                   天涯浪人
                                             
                
                
                (楼主)
            
              
              
                2021-01-14 12:58
              

            
            
                        
Below is the expansion of solution suggested by anton.

#include 
#include 
#include 
#include 

using namespace std;

class BaseClass
{
    string s;

public: 
    BaseClass() { s = "BaseClass";} 
virtual ~ BaseClass(){}
virtual void print()=0;
};


class Derived1 : public BaseClass
{
    int i;
public:
    Derived1() { i = 10; }
    void print() 
    {
        cout << i << std::endl;
    }

};

class Derived2 : public Derived1
{
    float f;
public:
    Derived2() { f = 4.3;}
    void print() 
    {
        cout << f << std::endl;
    }
};

class factory
{
mapm;
BaseClass* obj;
public:
factory()
{
obj=NULL;
}
BaseClass* FindType(string s);
void AddType(string s,BaseClass *obj);
void deleter();
~factory(){cout<<"deleting objects from map"<second;
   }

   m.clear( );  

 }
BaseClass* factory::FindType(string s)
{
if(m.find(s)!=m.end())
{

return  m[s];
}

return NULL;
}

int main()
{   
   BaseClass* obj;
   factory fact_obj; 
   fact_obj.AddType("d1",new Derived1());
   fact_obj.AddType("d2",new Derived2());
   obj=fact_obj.FindType("d1");
   if(obj!=NULL)
      {
    obj->print();
      }
    obj=fact_obj.FindType("d2");
    if(obj!=NULL)
     {
     obj->print(); 
     }

    return 0;
}

    
             
                                                        
            
            
              
                
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