+ template <class OtherT>
+ void copyConstruct(const ErrorOr<OtherT> &Other) {
+ // Construct an invalid ErrorOr if other is invalid.
+ if (!Other.IsValid)
+ return;
+ IsValid = true;
+ if (!Other.HasError) {
+ // Get the other value.
+ HasError = false;
+ new (get()) storage_type(*Other.get());
+ } else {
+ // Get other's error.
+ Error = Other.Error;
+ HasError = true;
+ Error->aquire();
+ }
+ }
+
+ template <class T1>
+ static bool compareThisIfSameType(const T1 &a, const T1 &b) {
+ return &a == &b;
+ }
+
+ template <class T1, class T2>
+ static bool compareThisIfSameType(const T1 &a, const T2 &b) {
+ return false;
+ }
+
+ template <class OtherT>
+ void copyAssign(const ErrorOr<OtherT> &Other) {
+ if (compareThisIfSameType(*this, Other))
+ return;
+
+ this->~ErrorOr();
+ new (this) ErrorOr(Other);
+ }
+
+#if LLVM_HAS_RVALUE_REFERENCES
+ template <class OtherT>
+ void moveConstruct(ErrorOr<OtherT> &&Other) {
+ // Construct an invalid ErrorOr if other is invalid.
+ if (!Other.IsValid)
+ return;
+ IsValid = true;
+ if (!Other.HasError) {
+ // Get the other value.
+ HasError = false;
+ new (get()) storage_type(std::move(*Other.get()));
+ // Tell other not to do any destruction.
+ Other.IsValid = false;
+ } else {
+ // Get other's error.
+ Error = Other.Error;
+ HasError = true;
+ // Tell other not to do any destruction.
+ Other.IsValid = false;
+ }
+ }
+
+ template <class OtherT>
+ void moveAssign(ErrorOr<OtherT> &&Other) {
+ if (compareThisIfSameType(*this, Other))
+ return;
+
+ this->~ErrorOr();
+ new (this) ErrorOr(std::move(Other));
+ }
+#endif
+