148 class Optional;  variable
158         is_template_instantiation_of<typename std::decay<U>::type, Optional>;
161 class Optional
168     friend class Optional;  variable
171     using self = Optional<U>;
192     constexpr Optional() {}  in Optional()  function
193     constexpr Optional(NulloptT) {}  in Optional()  function
195     Optional(const Optional& other) : base_flag(other.constructed()) {  in Optional()  function
200     Optional(Optional&& other) : base_flag(other.constructed()) {  in Optional()  function
210     Optional(const Optional<U>& other) : base_flag(other.constructed()) {  in Optional()  function
220     Optional(Optional<U>&& other) : base_flag(other.constructed()) {  in Optional()  function
227     Optional(const T& value) : base_flag(true) { new (&get()) T(value); }  in Optional()  function
229     Optional(T&& value) : base_flag(true) { new (&get()) T(std::move(value)); }  in Optional()  function
233     Optional(InplaceT, Args&&... args) : base_flag(true) {  in Optional()  function
241     Optional(InplaceT, std::initializer_list<U> il) : base_flag(true) {  in Optional()  function
246     Optional& operator=(const Optional& other) {
270     Optional& operator=(Optional&& other) {
292     Optional& operator=(const Optional<U>& other) {
314     Optional& operator=(Optional<U>&& other) {
340     Optional& operator=(U&& other) {
414     ~Optional() {  in ~Optional()
465         return const_cast<T&>(const_cast<const Optional*>(this)->get());  in get()
473 Optional<typename std::decay<T>::type> makeOptional(T&& t) {  in makeOptional()
474     return Optional<typename std::decay<T>::type>(std::forward<T>(t));  in makeOptional()
478 Optional<typename std::decay<T>::type> makeOptional(Args&&... args) {  in makeOptional()
479     return Optional<typename std::decay<T>::type>(kInplace,  in makeOptional()
484 bool operator==(const Optional<T>& l, const Optional<T>& r) {
488 bool operator==(const Optional<T>& l, NulloptT) {
492 bool operator==(NulloptT, const Optional<T>& r) {
496 bool operator==(const Optional<T>& l, const T& r) {
500 bool operator==(const T& l, const Optional<T>& r) {
505 bool operator!=(const Optional<T>& l, const Optional<T>& r) {
509 bool operator!=(const Optional<T>& l, NulloptT) {
513 bool operator!=(NulloptT, const Optional<T>& r) {
517 bool operator!=(const Optional<T>& l, const T& r) {
521 bool operator!=(const T& l, const Optional<T>& r) {
526 bool operator<(const Optional<T>& l, const Optional<T>& r) {
530 bool operator<(const Optional<T>&, NulloptT) {
534 bool operator<(NulloptT, const Optional<T>& r) {
538 bool operator<(const Optional<T>& l, const T& r) {
542 bool operator<(const T& l, const Optional<T>& r) {