Identifying objects

[toomanystars]

Hi guys, a quick question.

If I have a Base class, and say two derived classes A, and B with some virtual functions, and set things up thus.

  std::vector<Base> base;
  base.push_back(A());
  base.push_back(B());

Then, in order to loop through the vector structure we would run a for loop like this

 for(int i=0;i<base.size();i++){

 }

Now, my question is this, without using any special identifier such as a enum
is it possible int the C++ language to do this...

 for(int i=0;i<base.size();i++){
   if(base[i]==(Object A)
      //do this
    if(base[i]==(Object B)
      //do that
 }

So far I have been using enums, and it seems very clunky. Any help would be greatly appresicated.

[unsensible]

It can be done if you have the "==" operator properly overloaded in both of the derived classes.

[toomanystars]

Thanks unsensible, I will have a look at that.

Mike

[Cubbi]

std::vector<Base> base;

This creates a vector of Bases, no A or B can be put into it

base.push_back(A());

This copies ("slices") the Base part of A into the first position of the vector.

To build a collection of polymorphic objects, you need something more like std::vector<std::unique_ptr<Base>> bases;