108   typename std::aligned_storage<sizeof(T), alignof(T)>::type storage_;  variable
124     new (&storage_) T(reinterpret_cast<const T&>(rhs.storage_));  in Maybe()
132     new (&storage_) T(reinterpret_cast<const U&>(rhs.storage_));  in Maybe()
142     new (&storage_) T(std::move(reinterpret_cast<T&>(rhs.storage_)));  in Maybe()
154     new (&storage_) T(std::move(reinterpret_cast<U&>(rhs.storage_)));  in Maybe()
179     reinterpret_cast<T&>(storage_) = reinterpret_cast<const U&>(rhs.storage_);  in copy()
185     new (&storage_) T(reinterpret_cast<const U&>(rhs.storage_));  in copy()
215     reinterpret_cast<T&>(storage_) =  in move()
216         std::move(reinterpret_cast<U&>(rhs.storage_));  in move()
224     new (&storage_) T(std::move(reinterpret_cast<U&>(rhs.storage_)));  in move()
236   new (&storage_) T(value);  in Maybe()
241   new (&storage_) T(std::forward<T>(value));  in Maybe()
252   return reinterpret_cast<T&>(storage_);  in value()
258   return reinterpret_cast<const T&>(storage_);  in value()
266   return reinterpret_cast<const T&>(storage_);  in value_or_default()
271   reinterpret_cast<T&>(storage_).~T();  in destroy()