oop - C++ Vector of Subclasses, using it to overload the istream/ostream -

i'm looking hold vector of objects, of subclasses.

i thought able declaring vector of pointers baseclass (such vector<baseclass*> db), , declare subclass doing db.pushback(new subclass) (my example in link below touch different, along same lines);

• is possible store multiple subclasses in sense or need define new vector each subclass? in example given, there 1, realistically in program there four.

• if so, in overloaded >> in subclass1, dynamic casting type baseclass work call friended overloaded >> in baseclass?

http://ideone.com/qm5sry

edit:

sorry, wasn't entirely clear in second half of question. should have expanded.

i have program needs take input, , distribute throughout respective classes , subclasses. should take input cin >> class;, in case have overloaded >> operator.

however, when define data subclass (lines 34 39, , line 44), appears call baseclass, rather subclass. calls friend function defined in baseclass @ line 10, rather in line 21.

i'm not sure going wrong.

ideally output should be

printing:data x = 1 y = 2 

you should have virtual fromserial function reads in necessary data each class. here example http://ideone.com/wgwj8l . notice user of virtual keyword. need polymorphism. , note virtual destructor well.

#include <iostream> #include <vector> using namespace std;  class baseclass{ public:     int x; public:     baseclass(){x = 0;}      virtual istream& fromserial(istream& stream){ return stream >> x; }     virtual void print(){      cout << "baseclass::x = " <<  x << endl;     }     virtual ~baseclass(){} };  class subclass1: public baseclass{ public:     int y; public:     subclass1(){y = 0;}     virtual istream& fromserial(istream& stream){                         baseclass::fromserial(stream); //read baseclass first             return stream >> y;     }     virtual void print(){       baseclass::print();      cout << "subclass1::y = " << y << endl;     } };  baseclass* createnewclass(baseclass * temp) {     cout << "input 2 values: ";     temp->fromserial(cin);     return temp; }  int main() {     vector<baseclass*> db;     db.push_back(createnewclass(new subclass1));       cout << "\nprinting data: " << endl;     db[0]->print(); } 

input: 1 2

output:

input 2 values:  printing data:  baseclass::x = 1 subclass1::y = 2