Windows QPA: Fix some clang-tidy-warnings

- Replace index-based loops by range-based for
- Change else if to if after return/break/continue or simplify
- Fix indentation
- Do not check for non-null before invoking delete on pointer
- Use isEmpty() instead size() to check for empty containers
- Remove C-style casts
- Use raw string literal
- Do not repeat type in return, use {} instead
- Reference local variables by const ref where applicable

Change-Id: I5cc4b4026a10bddb561ba1ba8ec137e0d4119f94
Reviewed-by: Miguel Costa <miguel.costa@qt.io>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

15 files changed, 59 insertions, 69 deletions

diff --git a/src/plugins/platforms/windows/qwindowscursor.cpp b/src/plugins/platforms/windows/qwindowscursor.cpp
index 0924fb822e..1443e5e920 100644
--- a/src/plugins/platforms/windows/qwindowscursor.cpp
+++ b/src/plugins/platforms/windows/qwindowscursor.cpp
@@ -524,10 +524,11 @@ HCURSOR QWindowsCursor::createCursorFromShape(Qt::CursorShape cursorShape, const
     }
 
     // Load available standard cursors from resources
-    const QWindowsStandardCursorMapping *sEnd = standardCursors + sizeof(standardCursors) / sizeof(standardCursors[0]);
-    for (const QWindowsStandardCursorMapping *s = standardCursors; s < sEnd; ++s) {
-        if (s->shape == cursorShape)
-            return static_cast<HCURSOR>(LoadImage(0, s->resource, IMAGE_CURSOR, 0, 0, LR_DEFAULTSIZE | LR_SHARED));
+    for (const QWindowsStandardCursorMapping &s : standardCursors) {
+        if (s.shape == cursorShape) {
+            return static_cast<HCURSOR>(LoadImage(nullptr, s.resource, IMAGE_CURSOR,
+                                                  0, 0, LR_DEFAULTSIZE | LR_SHARED));
+        }
     }
 
     qWarning("%s: Invalid cursor shape %d", __FUNCTION__, cursorShape);
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
index 40ab2a4dd2..635033b43f 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
@@ -364,7 +364,7 @@ static BOOL QT_WIN_CALLBACK findDialogEnumWindowsProc(HWND hwnd, LPARAM lParam)
     wchar_t buf[256];
     if (!RealGetWindowClass(hwnd, buf, sizeof(buf)/sizeof(wchar_t)) || buf[0] != L'#')
         return TRUE;
-    if (!GetWindowTextW(hwnd, buf, sizeof(buf)/sizeof(wchar_t)) || wcscmp(buf, context->title.data()))
+    if (!GetWindowTextW(hwnd, buf, sizeof(buf)/sizeof(wchar_t)) || wcscmp(buf, context->title.data()) != 0)
         return TRUE;
     context->hwnd = hwnd;
     return FALSE;
@@ -1545,8 +1545,8 @@ QWindowsNativeDialogBase *QWindowsFileDialogHelper::createNativeDialog()
     result->updateDirectory();
     result->updateSelectedNameFilter();
     const QList<QUrl> initialSelection = opts->initiallySelectedFiles();
-    if (initialSelection.size() > 0) {
-        const QUrl url = initialSelection.front();
+    if (!initialSelection.empty()) {
+        const QUrl &url = initialSelection.constFirst();
         if (url.isLocalFile()) {
             QFileInfo info(url.toLocalFile());
             if (!info.isDir())
@@ -1698,7 +1698,7 @@ void QWindowsXpNativeFileDialog::doExec(HWND owner)
         const QStringList nameFilters = m_options->nameFilters();
         if (selectedFilterIndex >= 0 && selectedFilterIndex < nameFilters.size())
             m_data.setSelectedNameFilter(nameFilters.at(selectedFilterIndex));
-        QUrl firstFile = selectedFiles.front();
+        const QUrl &firstFile = selectedFiles.constFirst();
         m_data.setDirectory(firstFile.adjusted(QUrl::RemoveFilename));
         m_result = QPlatformDialogHelper::Accepted;
         emit accepted();
@@ -1727,7 +1727,7 @@ int QWindowsXpNativeFileDialog::existingDirCallback(HWND hwnd, UINT uMsg, LPARAM
     switch (uMsg) {
     case BFFM_INITIALIZED: {
         if (!m_title.isEmpty())
-            SetWindowText(hwnd, (wchar_t *)m_title.utf16());
+            SetWindowText(hwnd, reinterpret_cast<const wchar_t *>(m_title.utf16()));
         const QString initialFile = QDir::toNativeSeparators(m_data.directory().toLocalFile());
         if (!initialFile.isEmpty())
             SendMessage(hwnd, BFFM_SETSELECTION, TRUE, LPARAM(initialFile.utf16()));
diff --git a/src/plugins/platforms/windows/qwindowseglcontext.cpp b/src/plugins/platforms/windows/qwindowseglcontext.cpp
index a8d0a42bdb..52f3c56beb 100644
--- a/src/plugins/platforms/windows/qwindowseglcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowseglcontext.cpp
@@ -889,19 +889,19 @@ EGLConfig QWindowsEGLContext::chooseConfig(const QSurfaceFormat &format)
         EGLint green = 0;
         EGLint blue = 0;
         EGLint alpha = 0;
-        for (int i = 0; i < configs.size(); ++i) {
+        for (const EGLConfig &config : configs) {
             if (confAttrRed)
-                QWindowsEGLStaticContext::libEGL.eglGetConfigAttrib(display, configs[i], EGL_RED_SIZE, &red);
+                QWindowsEGLStaticContext::libEGL.eglGetConfigAttrib(display, config, EGL_RED_SIZE, &red);
             if (confAttrGreen)
-                QWindowsEGLStaticContext::libEGL.eglGetConfigAttrib(display, configs[i], EGL_GREEN_SIZE, &green);
+                QWindowsEGLStaticContext::libEGL.eglGetConfigAttrib(display, config, EGL_GREEN_SIZE, &green);
             if (confAttrBlue)
-                QWindowsEGLStaticContext::libEGL.eglGetConfigAttrib(display, configs[i], EGL_BLUE_SIZE, &blue);
+                QWindowsEGLStaticContext::libEGL.eglGetConfigAttrib(display, config, EGL_BLUE_SIZE, &blue);
             if (confAttrAlpha)
-                QWindowsEGLStaticContext::libEGL.eglGetConfigAttrib(display, configs[i], EGL_ALPHA_SIZE, &alpha);
+                QWindowsEGLStaticContext::libEGL.eglGetConfigAttrib(display, config, EGL_ALPHA_SIZE, &alpha);
 
             if (red == confAttrRed && green == confAttrGreen
                     && blue == confAttrBlue && alpha == confAttrAlpha)
-                return configs[i];
+                return config;
         }
     } while (reduceConfigAttributes(&configureAttributes));
 
diff --git a/src/plugins/platforms/windows/qwindowsglcontext.cpp b/src/plugins/platforms/windows/qwindowsglcontext.cpp
index 2409d70ec9..851a6c961e 100644
--- a/src/plugins/platforms/windows/qwindowsglcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowsglcontext.cpp
@@ -206,18 +206,12 @@ bool QWindowsOpengl32DLL::init(bool softwareRendering)
 
 BOOL QWindowsOpengl32DLL::swapBuffers(HDC dc)
 {
-    if (moduleIsNotOpengl32())
-        return wglSwapBuffers(dc);
-    else
-        return SwapBuffers(dc);
+    return moduleIsNotOpengl32() ? wglSwapBuffers(dc) : SwapBuffers(dc);
 }
 
 BOOL QWindowsOpengl32DLL::setPixelFormat(HDC dc, int pf, const PIXELFORMATDESCRIPTOR *pfd)
 {
-    if (moduleIsNotOpengl32())
-        return wglSetPixelFormat(dc, pf, pfd);
-    else
-        return SetPixelFormat(dc, pf, pfd);
+    return moduleIsNotOpengl32() ? wglSetPixelFormat(dc, pf, pfd) : SetPixelFormat(dc, pf, pfd);
 }
 
 QWindowsOpenGLContext *QOpenGLStaticContext::createContext(QOpenGLContext *context)
diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index 7194fa1d1f..4c31808c2d 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -255,8 +255,7 @@ QWindowsIntegrationPrivate::QWindowsIntegrationPrivate(const QStringList &paramL
 
 QWindowsIntegrationPrivate::~QWindowsIntegrationPrivate()
 {
-    if (m_fontDatabase)
-        delete m_fontDatabase;
+    delete m_fontDatabase;
 }
 
 QWindowsIntegration *QWindowsIntegration::m_instance = nullptr;
diff --git a/src/plugins/platforms/windows/qwindowskeymapper.cpp b/src/plugins/platforms/windows/qwindowskeymapper.cpp
index 48941d78ca..a2b5573f78 100644
--- a/src/plugins/platforms/windows/qwindowskeymapper.cpp
+++ b/src/plugins/platforms/windows/qwindowskeymapper.cpp
@@ -653,8 +653,8 @@ static inline int asciiToKeycode(char a, int state)
 
 void QWindowsKeyMapper::deleteLayouts()
 {
-    for (size_t i = 0; i < NumKeyboardLayoutItems; ++i)
-        keyLayout[i].exists = false;
+    for (KeyboardLayoutItem &k : keyLayout)
+        k.exists = false;
 }
 
 void QWindowsKeyMapper::changeKeyboard()
@@ -1111,7 +1111,8 @@ bool QWindowsKeyMapper::translateKeyEventInternal(QWindow *window, const MSG &ms
             if (uch.isHighSurrogate()) {
                 m_lastHighSurrogate = uch;
                 return true;
-            } else if (uch.isLowSurrogate() && !m_lastHighSurrogate.isNull()) {
+            }
+            if (uch.isLowSurrogate() && !m_lastHighSurrogate.isNull()) {
                 if (QObject *focusObject = QGuiApplication::focusObject()) {
                     const QChar chars[2] = {m_lastHighSurrogate, uch};
                     QInputMethodEvent event;
diff --git a/src/plugins/platforms/windows/qwindowsmime.cpp b/src/plugins/platforms/windows/qwindowsmime.cpp
index 0cfd79f451..98fccb118d 100644
--- a/src/plugins/platforms/windows/qwindowsmime.cpp
+++ b/src/plugins/platforms/windows/qwindowsmime.cpp
@@ -628,7 +628,8 @@ bool QWindowsMimeText::convertFromMime(const FORMATETC &formatetc, const QMimeDa
             }
             o[j]=0;
             return setData(r, pmedium);
-        } else if (cf == CF_UNICODETEXT) {
+        }
+        if (cf == CF_UNICODETEXT) {
             QString str = mimeData->text();
             const QChar *u = str.unicode();
             QString res;
@@ -750,9 +751,9 @@ QWindowsMimeURI::QWindowsMimeURI()
 bool QWindowsMimeURI::canConvertFromMime(const FORMATETC &formatetc, const QMimeData *mimeData) const
 {
     if (mimeData->hasUrls() && getCf(formatetc) == CF_HDROP) {
-        QList<QUrl> urls = mimeData->urls();
-        for (int i=0; i<urls.size(); i++) {
-            if (!urls.at(i).toLocalFile().isEmpty())
+        const QList<QUrl> urls = mimeData->urls();
+        for (const QUrl &url : urls) {
+            if (url.isLocalFile())
                 return true;
         }
     }
@@ -763,11 +764,11 @@ bool QWindowsMimeURI::convertFromMime(const FORMATETC &formatetc, const QMimeDat
 {
     if (canConvertFromMime(formatetc, mimeData)) {
         if (getCf(formatetc) == CF_HDROP) {
-            QList<QUrl> urls = mimeData->urls();
+            const QList<QUrl> &urls = mimeData->urls();
             QStringList fileNames;
             int size = sizeof(DROPFILES)+2;
-            for (int i=0; i<urls.size(); i++) {
-                QString fn = QDir::toNativeSeparators(urls.at(i).toLocalFile());
+            for (const QUrl &url : urls) {
+                const QString fn = QDir::toNativeSeparators(url.toLocalFile());
                 if (!fn.isEmpty()) {
                     size += sizeof(ushort) * size_t(fn.length() + 1);
                     fileNames.append(fn);
@@ -792,7 +793,8 @@ bool QWindowsMimeURI::convertFromMime(const FORMATETC &formatetc, const QMimeDat
             *f = 0;
 
             return setData(result, pmedium);
-        } else if (getCf(formatetc) == CF_INETURL_W) {
+        }
+        if (getCf(formatetc) == CF_INETURL_W) {
             QList<QUrl> urls = mimeData->urls();
             QByteArray result;
             if (!urls.isEmpty()) {
@@ -803,7 +805,8 @@ bool QWindowsMimeURI::convertFromMime(const FORMATETC &formatetc, const QMimeDat
             result.append('\0');
             result.append('\0');
             return setData(result, pmedium);
-        } else if (getCf(formatetc) == CF_INETURL) {
+        }
+        if (getCf(formatetc) == CF_INETURL) {
             QList<QUrl> urls = mimeData->urls();
             QByteArray result;
             if (!urls.isEmpty())
@@ -873,7 +876,7 @@ QVariant QWindowsMimeURI::convertToMime(const QString &mimeType, LPDATAOBJECT pD
 
             if (preferredType == QVariant::Url && urls.size() == 1)
                 return urls.at(0);
-            else if (!urls.isEmpty())
+            if (!urls.isEmpty())
                 return urls;
         } else if (canGetData(CF_INETURL_W, pDataObj)) {
             QByteArray data = getData(CF_INETURL_W, pDataObj);
@@ -1076,10 +1079,8 @@ QString QWindowsMimeImage::mimeForFormat(const FORMATETC &formatetc) const
 
 bool QWindowsMimeImage::canConvertToMime(const QString &mimeType, IDataObject *pDataObj) const
 {
-    if (mimeType == QLatin1String("application/x-qt-image") &&
-        (canGetData(CF_DIB, pDataObj) || canGetData(CF_PNG, pDataObj)))
-        return true;
-    return false;
+    return mimeType == QLatin1String("application/x-qt-image")
+        && (canGetData(CF_DIB, pDataObj) || canGetData(CF_PNG, pDataObj));
 }
 
 bool QWindowsMimeImage::canConvertFromMime(const FORMATETC &formatetc, const QMimeData *mimeData) const
@@ -1135,7 +1136,7 @@ bool QWindowsMimeImage::hasOriginalDIBV5(IDataObject *pDataObj) const
                 CoTaskMemFree(fc.ptd);
             if (fc.cfFormat == CF_DIB)
                 break;
-            else if (fc.cfFormat == CF_DIBV5) {
+            if (fc.cfFormat == CF_DIBV5) {
                 isSynthesized  = false;
                 break;
             }
@@ -1329,7 +1330,7 @@ QStringList QLastResortMimes::excludeList;
 QLastResortMimes::QLastResortMimes()
 {
     //MIME Media-Types
-    if (!ianaTypes.size()) {
+    if (ianaTypes.isEmpty()) {
         ianaTypes.append(QStringLiteral("application/"));
         ianaTypes.append(QStringLiteral("audio/"));
         ianaTypes.append(QStringLiteral("example/"));
@@ -1341,7 +1342,7 @@ QLastResortMimes::QLastResortMimes()
         ianaTypes.append(QStringLiteral("video/"));
     }
     //Types handled by other classes
-    if (!excludeList.size()) {
+    if (excludeList.isEmpty()) {
         excludeList.append(QStringLiteral("HTML Format"));
         excludeList.append(QStringLiteral("UniformResourceLocator"));
         excludeList.append(QStringLiteral("text/html"));
diff --git a/src/plugins/platforms/windows/qwindowsmousehandler.cpp b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
index 92aaf70e40..87f48e0c84 100644
--- a/src/plugins/platforms/windows/qwindowsmousehandler.cpp
+++ b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
@@ -363,9 +363,9 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
             }
             m_previousCaptureWindow = window;
             return true;
-        } else if (m_leftButtonDown && !actualLeftDown) {
-            m_leftButtonDown = false;
         }
+        if (m_leftButtonDown && !actualLeftDown)
+            m_leftButtonDown = false;
     }
 
     // In this context, neither an invisible nor a transparent window (transparent regarding mouse
diff --git a/src/plugins/platforms/windows/qwindowsnativeinterface.cpp b/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
index da6f13d01a..de11356fd4 100644
--- a/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
+++ b/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
@@ -275,11 +275,11 @@ QFunctionPointer QWindowsNativeInterface::platformFunction(const QByteArray &fun
 {
     if (function == QWindowsWindowFunctions::setTouchWindowTouchTypeIdentifier())
         return QFunctionPointer(QWindowsWindow::setTouchWindowTouchTypeStatic);
-    else if (function == QWindowsWindowFunctions::setHasBorderInFullScreenIdentifier())
+    if (function == QWindowsWindowFunctions::setHasBorderInFullScreenIdentifier())
         return QFunctionPointer(QWindowsWindow::setHasBorderInFullScreenStatic);
-    else if (function == QWindowsWindowFunctions::setWindowActivationBehaviorIdentifier())
+    if (function == QWindowsWindowFunctions::setWindowActivationBehaviorIdentifier())
         return QFunctionPointer(QWindowsNativeInterface::setWindowActivationBehavior);
-    else if (function == QWindowsWindowFunctions::isTabletModeIdentifier())
+    if (function == QWindowsWindowFunctions::isTabletModeIdentifier())
         return QFunctionPointer(QWindowsNativeInterface::isTabletMode);
     return nullptr;
 }
diff --git a/src/plugins/platforms/windows/qwindowsole.cpp b/src/plugins/platforms/windows/qwindowsole.cpp
index 3e62bbdeca..5ecdf46cea 100644
--- a/src/plugins/platforms/windows/qwindowsole.cpp
+++ b/src/plugins/platforms/windows/qwindowsole.cpp
@@ -365,10 +365,9 @@ QWindowsOleEnumFmtEtc::Clone(LPENUMFORMATETC FAR* newEnum)
     if (result->isNull()) {
         delete result;
         return ResultFromScode(E_OUTOFMEMORY);
-    } else {
-        *newEnum = result;
     }
 
+    *newEnum = result;
     return NOERROR;
 }
 
diff --git a/src/plugins/platforms/windows/qwindowsscreen.cpp b/src/plugins/platforms/windows/qwindowsscreen.cpp
index bf7f359aac..29165ef72c 100644
--- a/src/plugins/platforms/windows/qwindowsscreen.cpp
+++ b/src/plugins/platforms/windows/qwindowsscreen.cpp
@@ -69,7 +69,7 @@ static inline QDpi monitorDPI(HMONITOR hMonitor)
         if (SUCCEEDED(QWindowsContext::shcoredll.getDpiForMonitor(hMonitor, 0, &dpiX, &dpiY)))
             return QDpi(dpiX, dpiY);
     }
-    return QDpi(0, 0);
+    return {0, 0};
 }
 
 typedef QList<QWindowsScreenData> WindowsScreenDataList;
@@ -401,7 +401,8 @@ QPlatformScreen::SubpixelAntialiasingType QWindowsScreen::subpixelAntialiasingTy
 {
     QPlatformScreen::SubpixelAntialiasingType type = QPlatformScreen::subpixelAntialiasingTypeHint();
     if (type == QPlatformScreen::Subpixel_None) {
-        QSettings settings(QLatin1String("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Avalon.Graphics\\DISPLAY1"), QSettings::NativeFormat);
+        QSettings settings(QLatin1String(R"(HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Avalon.Graphics\DISPLAY1)"),
+                           QSettings::NativeFormat);
         int registryValue = settings.value(QLatin1String("PixelStructure"), -1).toInt();
         switch (registryValue) {
         case 0:
diff --git a/src/plugins/platforms/windows/qwindowstabletsupport.cpp b/src/plugins/platforms/windows/qwindowstabletsupport.cpp
index 2ab59b11ca..fa209f09c4 100644
--- a/src/plugins/platforms/windows/qwindowstabletsupport.cpp
+++ b/src/plugins/platforms/windows/qwindowstabletsupport.cpp
@@ -108,7 +108,7 @@ inline QPointF QWindowsTabletDeviceData::scaleCoordinates(int coordX, int coordY
         ((coordY - minY) * qAbs(targetHeight) / qAbs(qreal(maxY - minY))) + targetY :
         ((qAbs(maxY) - (coordY - minY)) * qAbs(targetHeight) / qAbs(qreal(maxY - minY))) + targetY;
 
-    return QPointF(x, y);
+    return {x, y};
 }
 
 template <class Stream>
diff --git a/src/plugins/platforms/windows/qwindowstheme.cpp b/src/plugins/platforms/windows/qwindowstheme.cpp
index 9d2d4c28e0..d01a7b0a8a 100644
--- a/src/plugins/platforms/windows/qwindowstheme.cpp
+++ b/src/plugins/platforms/windows/qwindowstheme.cpp
@@ -107,7 +107,7 @@ static inline bool booleanSystemParametersInfo(UINT what, bool defaultValue)
 {
     BOOL result;
     if (SystemParametersInfo(what, 0, &result, 0))
-        return result ? true : false;
+        return result != FALSE;
     return defaultValue;
 }
 
@@ -121,9 +121,9 @@ static inline DWORD dWordSystemParametersInfo(UINT what, DWORD defaultValue)
 
 static inline QColor mixColors(const QColor &c1, const QColor &c2)
 {
-    return QColor ((c1.red() + c2.red()) / 2,
-                   (c1.green() + c2.green()) / 2,
-                   (c1.blue() + c2.blue()) / 2);
+    return {(c1.red() + c2.red()) / 2,
+            (c1.green() + c2.green()) / 2,
+            (c1.blue() + c2.blue()) / 2};
 }
 
 static inline QColor getSysColor(int index)
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 150ab5fc04..17fc120b42 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -660,7 +660,7 @@ QWindowsWindowData
     WindowData result;
     result.flags = flags;
 
-    const HINSTANCE appinst = (HINSTANCE)GetModuleHandle(0);
+    const auto appinst = reinterpret_cast<HINSTANCE>(GetModuleHandle(nullptr));
 
     const QString windowClassName = QWindowsContext::instance()->registerWindowClass(w);
 
@@ -1374,18 +1374,12 @@ bool QWindowsWindow::isEmbedded() const
 
 QPoint QWindowsWindow::mapToGlobal(const QPoint &pos) const
 {
-    if (m_data.hwnd)
-        return QWindowsGeometryHint::mapToGlobal(m_data.hwnd, pos);
-    else
-        return pos;
+    return m_data.hwnd ? QWindowsGeometryHint::mapToGlobal(m_data.hwnd, pos) : pos;
 }
 
 QPoint QWindowsWindow::mapFromGlobal(const QPoint &pos) const
 {
-    if (m_data.hwnd)
-        return QWindowsGeometryHint::mapFromGlobal(m_data.hwnd, pos);
-    else
-        return pos;
+    return m_data.hwnd ? QWindowsGeometryHint::mapFromGlobal(m_data.hwnd, pos) : pos;
 }
 
 static inline HWND transientParentHwnd(HWND hwnd)
diff --git a/src/plugins/platforms/windows/qwindowswindow.h b/src/plugins/platforms/windows/qwindowswindow.h
index 5ff25eb474..8f030f1917 100644
--- a/src/plugins/platforms/windows/qwindowswindow.h
+++ b/src/plugins/platforms/windows/qwindowswindow.h
@@ -430,7 +430,7 @@ inline QWindowsWindow *QWindowsWindow::windowsWindowOf(const QWindow *w)
 
 void *QWindowsWindow::userDataOf(HWND hwnd)
 {
-    return (void *)GetWindowLongPtr(hwnd, GWLP_USERDATA);
+    return reinterpret_cast<void *>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
 }
 
 void QWindowsWindow::setUserDataOf(HWND hwnd, void *ud)