Class template inheritance C++

Question

I\'d like to inherit from the template class and change the behavior when the operators \"()\" are called - I want to call another function. This code

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Answer 1

When inheriting you must show how to instantiate the parent template, if same template class T can be used do this:

template<typename T>
class InsertItem
{
protected:
    int counter;
    T   destination; 

public:
    virtual void operator()(std::string item) {
        destination->Insert(item.c_str(), counter++);
    }

public:
    InsertItem(T argDestination) {
        counter= 0;
        destination = argDestination;
    }
};

template<typename T>
class InsertItem2 : InsertItem<T>
{
public:
    virtual void operator()(std::string item) {
        destination ->Insert2(item.c_str(), counter++, 0);
    }
};

If something else is needed just change the line:

class InsertItem2 : InsertItem<needed template type here>