Re: great c++ question

Bobba Dobba wrote:


 >
 > #include <iostream>
 > #include <vector>
 > class AbstrBase
 > {
 > public:
 > virtual void run()=0;
 > };
 > class Int:public AbstrBase
 > {
 > int m_i;
 > public:
 > void setI(int i)
 > {
 > m_i = i;
 > };
 > const int& getI()const
 > {
 > return m_i;
 > };
 > void run()
 > {
 > std::cout << "Value is of type integer" << std::endl;
 > std::cout << "Value is=" << m_i << std::endl;
 > };
 >
 > };
 > class Str:public AbstrBase
 > {
 > std::string m_s;
 > public:
 > void setS(const std::string s)
 > {
 > m_s = s;
 > };
 > const std::string& getS()const
 > {
 > return m_s;
 > };
 > void run()
 > {
 > std::cout << "Value is of type string" << std::endl;
 > std::cout << "Value is=" << m_s << std::endl;
 > };
 > };
 > class Container:public std::vector<AbstrBase*>
 > {
 > };
 > int main(void)
 > {
 > Container c;
 > Int * a = new Int;
 > a->setI(1);
 > Str * b = new Str;
 > b->setS(std::string("hello world!"));
 > c.push_back(a);
 > c.push_back(b);
 > std::vector<AbstrBase*>::iterator it = c.begin();
 > while(it != c.end() )
 > {
 > (*it)->run();
 > it++;
 > }
 > return 0;
 > }

OK, but all you have shown here is an example of polymorphism and
dynamic binding. Both of these are well-known and basic OO concepts
that can be implemented in C++. If the question really was about this,
than it's not a very interesting or "great c++ question," as the OP stated.

However, the question explicitly asked about adding data _members_ at
runtime. That is something entirely different from what you are doing here.