No virtual member function templates in C++03 through C++14

main.cpp

#include <iostream>
#include <memory>

struct A {
  virtual void foo() const {
    std::cout << "virtual A::foo()'s called" << std::endl;
  }
};

struct B {
  template <unsigned N>
  void foo() const {
    std::cout << "template B::foo<" << N << ">()'s called" << std::endl;
  }
};

template <unsigned M>
struct C {
  void foo() const {
    std::cout << "template C<" << M << ">::foo()'s called" << std::endl;
  }
};

template <unsigned M>
struct D {
  template <unsigned N>
  void foo() const {
    std::cout << "template D<" << M << ">::foo<" << N << ">()'s called" << std::endl;
  }
};

template <unsigned M>
struct E {
  virtual void foo() const {
    std::cout << "virtual E<" << M << ">::foo()'s called" << std::endl;
  }
};

#ifndef NO_TEMPLATE_VIRTUAL
struct F {
  template <unsigned N>
  virtual void foo() const {
    std::cout << "template virtual F::foo<" << N << ">()'s called" << std::endl;
  }
};
#endif


int main() {
  const auto a = std::unique_ptr<A>(new A());
  a->foo();

  const auto b = std::unique_ptr<B>(new B());
  b->foo<1>();
  b->foo<2>();

  const auto c1 = std::unique_ptr<C<1>>(new C<1>());
  const auto c2 = std::unique_ptr<C<2>>(new C<2>());
  c1->foo();
  c2->foo();

  const auto d1 = std::unique_ptr<D<1>>(new D<1>());
  const auto d2 = std::unique_ptr<D<2>>(new D<2>());
  d1->foo<1>();
  d1->foo<2>();
  d2->foo<1>();
  d2->foo<2>();

  const auto e1 = std::unique_ptr<E<1>>(new E<1>());
  const auto e2 = std::unique_ptr<E<2>>(new E<2>());
  e1->foo();
  e2->foo();

#ifndef NO_TEMPLATE_VIRTUAL
  const auto f = std::unique_ptr<F>(new F());
  f->foo<1>();
  f->foo<2>();
#endif
}