成员的完整列表，这些成员属于 phmap::optional_internal::optional_data_base< T >,包括所有继承而来的类成员

assign(U &&u)	phmap::optional_internal::optional_data_base< T >	inlineprotected
base typedef	phmap::optional_internal::optional_data_base< T >	protected
construct(Args &&... args)	phmap::optional_internal::optional_data_base< T >	inlineprotected
data_	phmap::optional_internal::optional_data_dtor_base< T, unused >
destruct() noexcept	phmap::optional_internal::optional_data_dtor_base< T, unused >	inlineprotected
dummy_	phmap::optional_internal::optional_data_dtor_base< T, unused >
engaged_	phmap::optional_internal::optional_data_dtor_base< T, unused >	protected
optional_data_base()=default	phmap::optional_internal::optional_data_base< T >	protected
optional_data_base(in_place_t t, Args &&... args)	phmap::optional_internal::optional_data_base< T >	inlineexplicitprotected
optional_data_dtor_base() noexcept	phmap::optional_internal::optional_data_dtor_base< T, unused >	inlineprotected
optional_data_dtor_base(in_place_t, Args &&... args)	phmap::optional_internal::optional_data_dtor_base< T, unused >	inlineexplicitprotected
~optional_data_dtor_base()	phmap::optional_internal::optional_data_dtor_base< T, unused >	inlineprotected