1 files changed, 13 insertions, 7 deletions
diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index 6a5c8f4fe5..bbac2d0327 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -313,16 +313,22 @@ public:
     inline T &operator*() const { return *data(); }
     inline T *operator->() const { return data(); }
 
-    QSharedPointer() Q_DECL_NOTHROW : value(Q_NULLPTR), d(Q_NULLPTR) {}
+    Q_DECL_CONSTEXPR QSharedPointer() Q_DECL_NOTHROW : value(nullptr), d(nullptr) { }
     ~QSharedPointer() { deref(); }
 
-    inline explicit QSharedPointer(T *ptr) : value(ptr) // noexcept
+    Q_DECL_CONSTEXPR QSharedPointer(std::nullptr_t) Q_DECL_NOTHROW : value(nullptr), d(nullptr) { }
+
+    template <class X>
+    inline explicit QSharedPointer(X *ptr) : value(ptr) // noexcept
     { internalConstruct(ptr, QtSharedPointer::NormalDeleter()); }
 
-    template <typename Deleter>
-    inline QSharedPointer(T *ptr, Deleter deleter) : value(ptr) // throws
+    template <class X, typename Deleter>
+    inline QSharedPointer(X *ptr, Deleter deleter) : value(ptr) // throws
     { internalConstruct(ptr, deleter); }
 
+    template <typename Deleter>
+    QSharedPointer(std::nullptr_t, Deleter) : value(nullptr), d(nullptr) { }
+
     QSharedPointer(const QSharedPointer &other) Q_DECL_NOTHROW : value(other.value), d(other.d)
     { if (d) ref(); }
     QSharedPointer &operator=(const QSharedPointer &other) Q_DECL_NOTHROW
@@ -512,15 +518,15 @@ private:
 
     inline void enableSharedFromThis(...) {}
 
-    template <typename Deleter>
-    inline void internalConstruct(T *ptr, Deleter deleter)
+    template <typename X, typename Deleter>
+    inline void internalConstruct(X *ptr, Deleter deleter)
     {
         if (!ptr) {
             d = Q_NULLPTR;
             return;
         }
 
-        typedef QtSharedPointer::ExternalRefCountWithCustomDeleter<T, Deleter> Private;
+        typedef QtSharedPointer::ExternalRefCountWithCustomDeleter<X, Deleter> Private;
 # ifdef QT_SHAREDPOINTER_TRACK_POINTERS
         typename Private::DestroyerFn actualDeleter = &Private::safetyCheckDeleter;
 # else