Examples of errors detected by the V1099 diagnostic

V1099. Using the function of uninitialized derived class while initializing the base class will lead to undefined behavior.

Battle for Wesnoth

V1099 [CWE-908] Using the 'window_id' function of uninitialized derived class while initializing the 'modal_dialog' base class will lead to undefined behavior. install_dependencies.hpp 29

class install_dependencies : public modal_dialog
{
public:
  explicit install_dependencies(const addons_list& addons)
    : modal_dialog(window_id()), addons_(addons)           // <=
  {}
....
private:
  virtual const std::string& window_id() const override;
....
}