Add QFutureInterfaceBase::get() to retrieve internals of QFuture

For generic interop with other parts of Qt, we need to be able to
extract the type-erased internal storage of QFuture<T>. In particular,
QtWebChannel needs this to transparently support QFuture<T> as a method
return type.

Task-number: QTBUG-92903
Change-Id: I763f054656b8810d58720262d364baf42c47eb37
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/corelib/thread/qfuture.h b/src/corelib/thread/qfuture.h
index 8c04b8c437..ab08f7861c 100644
--- a/src/corelib/thread/qfuture.h
+++ b/src/corelib/thread/qfuture.h
@@ -300,6 +300,8 @@ private:
     template<class U>
     friend class QFuture;
 
+    friend class QFutureInterfaceBase;
+
     template<class Function, class ResultType, class ParentResultType>
     friend class QtPrivate::Continuation;
 
@@ -430,6 +432,12 @@ inline QFuture<void> QFutureInterface<void>::future()
     return QFuture<void>(this);
 }
 
+template<typename T>
+QFutureInterfaceBase QFutureInterfaceBase::get(const QFuture<T> &future)
+{
+    return future.d;
+}
+
 Q_DECLARE_SEQUENTIAL_ITERATOR(Future)
 
 QT_END_NAMESPACE