Method get_i_from_base

test/exec/test_function.cpp:191–194

  struct iface2
  {
    exec::function<int(iface2 const *) noexcept> get_i_from_base() const noexcept
    {
      return exec::function<int(iface2 const *) noexcept>(this, &iface2::get_i_virtually);
    }

    virtual exec::function<int() noexcept> get_i_virtually() const noexcept = 0;
  };