41 struct OptionalStorageBase {  struct
44   constexpr OptionalStorageBase() : empty_('\0') {}  in OptionalStorageBase()  function
47   constexpr explicit OptionalStorageBase(in_place_t, Args&&... args)  in OptionalStorageBase()  function
61   ~OptionalStorageBase() {  in ~OptionalStorageBase()  argument
84 struct OptionalStorageBase<T, true /* trivially destructible */> {  argument
87   constexpr OptionalStorageBase() : empty_('\0') {}
90   constexpr explicit OptionalStorageBase(in_place_t, Args&&... args)
134 struct OptionalStorage : OptionalStorageBase<T> {
140   using OptionalStorageBase<T>::is_populated_;
141   using OptionalStorageBase<T>::value_;
142   using OptionalStorageBase<T>::Init;
145   using OptionalStorageBase<T>::OptionalStorageBase;
167     : OptionalStorageBase<T> {
168   using OptionalStorageBase<T>::is_populated_;
169   using OptionalStorageBase<T>::value_;
170   using OptionalStorageBase<T>::Init;
171   using OptionalStorageBase<T>::OptionalStorageBase;
187     : OptionalStorageBase<T> {
188   using OptionalStorageBase<T>::is_populated_;
189   using OptionalStorageBase<T>::value_;
190   using OptionalStorageBase<T>::Init;
191   using OptionalStorageBase<T>::OptionalStorageBase;
206     : OptionalStorageBase<T> {
210   using OptionalStorageBase<T>::OptionalStorageBase;