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, 2 deletions

diff --git a/examples/widgets/itemviews/storageview/storagemodel.cpp b/examples/widgets/itemviews/storageview/storagemodel.cpp
index d70f53ce89..9f8d229c77 100644
--- a/examples/widgets/itemviews/storageview/storagemodel.cpp
+++ b/examples/widgets/itemviews/storageview/storagemodel.cpp
@@ -43,6 +43,7 @@
 
 #include <QDir>
 #include <qmath.h>
+#include <cmath>
 
 static QString sizeToString(qint64 size)
 {
@@ -51,11 +52,11 @@ static QString sizeToString(qint64 size)
     if (size <= 0)
         return StorageModel::tr("0 b");
 
-    double power = log((double)size)/log(1024.0);
+    double power = std::log((double)size)/std::log(1024.0);
     int intPower = (int)power;
     intPower = intPower >= 8 ? 8 - 1 : intPower;
 
-    double normSize = size / pow(1024.0, intPower);
+    double normSize = size / std::pow(1024.0, intPower);
     //: this should expand to "1.23 GB"
     return StorageModel::tr("%1 %2").arg(normSize, 0, 'f', intPower > 0 ? 2 : 0).arg(strings[intPower]);
 }