+template <class T>
+void declare_flag(const std::string& name, std::initializer_list<const char*> aliases, const std::string& description,
+ T value, std::function<void(const T&)> callback = std::function<void(const T&)>())
+{
+ declare_flag(name, description, std::move(value), std::move(callback));
+ alias(name.c_str(), aliases);
+}