diff --git a/src/corelib/tools/qscopedpointer.h b/src/corelib/tools/qscopedpointer.h
index af0c0ed336..4acec9c1f6 100644
--- a/src/corelib/tools/qscopedpointer.h
+++ b/src/corelib/tools/qscopedpointer.h
@@ -95,7 +95,6 @@ typedef QScopedPointerObjectDeleteLater<QObject> QScopedPointerDeleteLater;
 template <typename T, typename Cleanup = QScopedPointerDeleter<T> >
 class QScopedPointer
 {
-    typedef T *QScopedPointer:: *RestrictedBool;
 public:
     explicit QScopedPointer(T *p = nullptr) noexcept : d(p)
     {
@@ -123,17 +122,10 @@ public:
         return !d;
     }
 
-#if defined(Q_QDOC)
-    inline operator bool() const
+    explicit operator bool() const
     {
-        return isNull() ? nullptr : &QScopedPointer::d;
+        return !isNull();
     }
-#else
-    operator RestrictedBool() const noexcept
-    {
-        return isNull() ? nullptr : &QScopedPointer::d;
-    }
-#endif
 
     T *data() const noexcept
     {
diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index 235cbe144b..35058a1c6e 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -283,7 +283,6 @@ namespace QtSharedPointer {
 
 template <class T> class QSharedPointer
 {
-    typedef T *QSharedPointer:: *RestrictedBool;
     typedef QtSharedPointer::ExternalRefCountData Data;
     template <typename X>
     using IfCompatible = typename std::enable_if<std::is_convertible<X*, T*>::value, bool>::type;
@@ -301,7 +300,7 @@ public:
     T *data() const noexcept { return value; }
     T *get() const noexcept { return value; }
     bool isNull() const noexcept { return !data(); }
-    operator RestrictedBool() const noexcept { return isNull() ? nullptr : &QSharedPointer::value; }
+    explicit operator bool() const noexcept { return !isNull(); }
     bool operator !() const noexcept { return isNull(); }
     T &operator*() const { return *data(); }
     T *operator->() const noexcept { return data(); }
@@ -539,7 +538,6 @@ public:
 template <class T>
 class QWeakPointer
 {
-    typedef T *QWeakPointer:: *RestrictedBool;
     typedef QtSharedPointer::ExternalRefCountData Data;
     template <typename X>
     using IfCompatible = typename std::enable_if<std::is_convertible<X*, T*>::value, bool>::type;
@@ -554,7 +552,7 @@ public:
     typedef qptrdiff difference_type;
 
     bool isNull() const noexcept { return d == nullptr || d->strongref.loadRelaxed() == 0 || value == nullptr; }
-    operator RestrictedBool() const noexcept { return isNull() ? nullptr : &QWeakPointer::value; }
+    explicit operator bool() const noexcept { return !isNull(); }
     bool operator !() const noexcept { return isNull(); }
 
 #if QT_DEPRECATED_SINCE(5, 14)
diff --git a/src/opengl/qopengltextureblitter.cpp b/src/opengl/qopengltextureblitter.cpp
index b350e8e0e3..0f389547cc 100644
--- a/src/opengl/qopengltextureblitter.cpp
+++ b/src/opengl/qopengltextureblitter.cpp
@@ -440,7 +440,7 @@ bool QOpenGLTextureBlitter::create()
 bool QOpenGLTextureBlitter::isCreated() const
 {
     Q_D(const QOpenGLTextureBlitter);
-    return d->programs[QOpenGLTextureBlitterPrivate::TEXTURE_2D].glProgram;
+    return !d->programs[QOpenGLTextureBlitterPrivate::TEXTURE_2D].glProgram.isNull();
 }
 
 /*!
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.h b/src/plugins/platforms/windows/qwindowsdialoghelpers.h
index 8686749011..55167ad36d 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.h
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.h
@@ -80,7 +80,7 @@ public:
 protected:
     QWindowsDialogHelperBase() = default;
     QWindowsNativeDialogBase *nativeDialog() const;
-    inline bool hasNativeDialog() const { return m_nativeDialog; }
+    inline bool hasNativeDialog() const { return !m_nativeDialog.isNull(); }
     void timerEvent(QTimerEvent *) override;
 
 private: