template-sample-inheritance.cpp

#include <stdio.h>
#include <vector>

class IDumpable {
public:
    virtual void Dump() = 0;
};

// For inheritance
template <class T>
class Hoge : public IDumpable, public std::vector<T>{
public:
    void Dump() {
        printf("size = %d\n", this->size());
    }
};

int main()
{
    Hoge<int> a;
    a.push_back(10);
    a.push_back(20);

    IDumpable* d = &a;
    d->Dump();

    return 0;
}