pointer to std::vector of arbitrary type (or any other templated class)

Question

let\'s say i want to have a member variable for a pointer to std::vector but i do not want to specify what type of variable it stores. I want to access only those functions that

Answer 1

You are almost at the answer. Instead of making std::vector inherit from Ivector, create a new class:

template 
class IVectorImpl : public Ivector
{
public:
    explicit IVectorImpl(std::vector * Data) : m_Data(Data){}
    std::vector * m_Data;
 ...
     virtual int size() const {return m_Data->size();}
  // Implement all the Ivector functions here to call the respective functions off of m_Data
};

Now have your Foo class keep a pointer to Ivector instead of std::vector.

Make Foo::setVec templated

template 
void setVec(std::vector * vec)
{
   Ivector * newVec = new IVectorImpl(vec);
   delete myVec;
   myVec = newVec;
}