How to achieve “virtual template function” in C++

Question

first off: I have read and I know now that a virtual template member function is not (yet?) possible in C++. A workaround would be to make the class a template and then use

Answer 1

You can create a template class with virtual function, and implement the function in the derived class without using template in the follwing way:

a.h:

template 
class A
{
public:
    A() { qDebug() << "a"; }

    virtual A* Func(T _template) { return new A;}
};


b.h:

class B : public A
{
public:
    B();
    virtual A* Func(int _template) { return new B;}
};


and the function CTOR and call 

  A* a1=new B;
    int x=1;
    a1->Func(x);

unfortunately i havn't found a way to create a virtual function with template parameters without declaring the class as a template and it template type on the dervied class