[c++] Can a class member function template be virtual?

No they can't. But:

template<typename T>
class Foo {
public:
  template<typename P>
  void f(const P& p) {
    ((T*)this)->f<P>(p);
  }
};

class Bar : public Foo<Bar> {
public:
  template<typename P>
  void f(const P& p) {
    std::cout << p << std::endl;
  }
};

int main() {
  Bar bar;

  Bar *pbar = &bar;
  pbar -> f(1);

  Foo<Bar> *pfoo = &bar;
  pfoo -> f(1);
};

has much the same effect if all you want to do is have a common interface and defer implementation to subclasses.

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