Revamp Mandelbrot example: Add const/constexpr when applicable

Add const in front of local variables when applicable.

Replace const by constexpr when the value of the variable can be
calculated at compile-time.

Task-number: QTBUG-108861
Pick-to: 6.6 6.5 6.6.0
Change-Id: I2cd1bc97aaa07d6d564731d9ccddba9a74e96fef
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

1 files changed, 3 insertions, 3 deletions

diff --git a/examples/corelib/threads/mandelbrot/renderthread.cpp b/examples/corelib/threads/mandelbrot/renderthread.cpp
index 7e4ff5ba8e..77a14a6ac1 100644
--- a/examples/corelib/threads/mandelbrot/renderthread.cpp
+++ b/examples/corelib/threads/mandelbrot/renderthread.cpp
@@ -69,16 +69,16 @@ void RenderThread::run()
 //! [3]
 
 //! [4]
-        int halfWidth = resultSize.width() / 2;
+        const int halfWidth = resultSize.width() / 2;
 //! [4] //! [5]
-        int halfHeight = resultSize.height() / 2;
+        const int halfHeight = resultSize.height() / 2;
         QImage image(resultSize, QImage::Format_RGB32);
         image.setDevicePixelRatio(devicePixelRatio);
 
         int pass = 0;
         while (pass < numPasses) {
             const int MaxIterations = (1 << (2 * pass + 6)) + 32;
-            const int Limit = 4;
+            constexpr int Limit = 4;
             bool allBlack = true;
 
             timer.restart();