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, 3 insertions, 3 deletions

diff --git a/examples/widgets/itemviews/stardelegate/starrating.cpp b/examples/widgets/itemviews/stardelegate/starrating.cpp
index af67ae11da..568666f93a 100644
--- a/examples/widgets/itemviews/stardelegate/starrating.cpp
+++ b/examples/widgets/itemviews/stardelegate/starrating.cpp
@@ -39,7 +39,7 @@
 ****************************************************************************/
 
 #include <QtWidgets>
-#include <math.h>
+#include <cmath>
 
 #include "starrating.h"
 
@@ -53,8 +53,8 @@ StarRating::StarRating(int starCount, int maxStarCount)
 
     starPolygon << QPointF(1.0, 0.5);
     for (int i = 1; i < 5; ++i)
-        starPolygon << QPointF(0.5 + 0.5 * cos(0.8 * i * 3.14),
-                               0.5 + 0.5 * sin(0.8 * i * 3.14));
+        starPolygon << QPointF(0.5 + 0.5 * std::cos(0.8 * i * 3.14),
+                               0.5 + 0.5 * std::sin(0.8 * i * 3.14));
 
     diamondPolygon << QPointF(0.4, 0.5) << QPointF(0.5, 0.4)
                    << QPointF(0.6, 0.5) << QPointF(0.5, 0.6)