Use C++ <cmath> instead of <math.h>

Including math.h can pollute the default namespace, and break
some compilers if cmath versions of the method are declared as using.

Switching to C++ math functions also greatly simplifies handling of
float qreal as C++ automatically chooses the right method.

[ChangeLog][QtCore][QtMath] qmath.h no longer includes math.h, so any
sources depending on that indirect inclusion may fail to build.

Change-Id: I4d0e331dafba354ec05dc5052e61ef4ff8d387fe
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/examples/qtconcurrent/imagescaling/imagescaling.cpp b/examples/qtconcurrent/imagescaling/imagescaling.cpp
index 15b0e7ca5b..169531119a 100644
--- a/examples/qtconcurrent/imagescaling/imagescaling.cpp
+++ b/examples/qtconcurrent/imagescaling/imagescaling.cpp
@@ -38,7 +38,7 @@
 **
 ****************************************************************************/
 #include "imagescaling.h"
-#include "math.h"
+#include <qmath.h>
 
 const int imageSize = 100;
 
@@ -110,7 +110,7 @@ void Images::open()
     qDeleteAll(labels);
     labels.clear();
 
-    int dim = sqrt(qreal(files.count())) + 1;
+    int dim = qSqrt(qreal(files.count())) + 1;
     for (int i = 0; i < dim; ++i) {
         for (int j = 0; j < dim; ++j) {
             QLabel *imageLabel = new QLabel;