QSharedPointer/QWeakPointer/QScopedPointer: add comparison against nullptr

Some constructors were added, but the comparison operators were missing.
The STL has them, so we ought have them too.

Change-Id: I030c14a3b355988f509716b4b1b1a835b3ab9481
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index dc118d7a68..0f769ffa86 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -822,6 +822,54 @@ bool operator!=(const QSharedPointer<T> &ptr1, const QWeakPointer<X> &ptr2) Q_DE
     return ptr2 != ptr1;
 }
 
+template<class T>
+inline bool operator==(const QSharedPointer<T> &lhs, std::nullptr_t) Q_DECL_NOTHROW
+{
+    return lhs.isNull();
+}
+
+template<class T>
+inline bool operator!=(const QSharedPointer<T> &lhs, std::nullptr_t) Q_DECL_NOTHROW
+{
+    return !lhs.isNull();
+}
+
+template<class T>
+inline bool operator==(std::nullptr_t, const QSharedPointer<T> &rhs) Q_DECL_NOTHROW
+{
+    return rhs.isNull();
+}
+
+template<class T>
+inline bool operator!=(std::nullptr_t, const QSharedPointer<T> &rhs) Q_DECL_NOTHROW
+{
+    return !rhs.isNull();
+}
+
+template<class T>
+inline bool operator==(const QWeakPointer<T> &lhs, std::nullptr_t) Q_DECL_NOTHROW
+{
+    return lhs.isNull();
+}
+
+template<class T>
+inline bool operator!=(const QWeakPointer<T> &lhs, std::nullptr_t) Q_DECL_NOTHROW
+{
+    return !lhs.isNull();
+}
+
+template<class T>
+inline bool operator==(std::nullptr_t, const QWeakPointer<T> &rhs) Q_DECL_NOTHROW
+{
+    return rhs.isNull();
+}
+
+template<class T>
+inline bool operator!=(std::nullptr_t, const QWeakPointer<T> &rhs) Q_DECL_NOTHROW
+{
+    return !rhs.isNull();
+}
+
 //
 // operator-
 //