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/src/gui/math3d/qvector3d.cpp b/src/gui/math3d/qvector3d.cpp
index fa09a43480..a93d994a70 100644
--- a/src/gui/math3d/qvector3d.cpp
+++ b/src/gui/math3d/qvector3d.cpp
@@ -235,7 +235,7 @@ QVector3D QVector3D::normalized() const
     if (qFuzzyIsNull(len - 1.0f)) {
         return *this;
     } else if (!qFuzzyIsNull(len)) {
-        double sqrtLen = sqrt(len);
+        double sqrtLen = std::sqrt(len);
         return QVector3D(float(double(xp) / sqrtLen),
                          float(double(yp) / sqrtLen),
                          float(double(zp) / sqrtLen));
@@ -259,7 +259,7 @@ void QVector3D::normalize()
     if (qFuzzyIsNull(len - 1.0f) || qFuzzyIsNull(len))
         return;
 
-    len = sqrt(len);
+    len = std::sqrt(len);
 
     xp = float(double(xp) / len);
     yp = float(double(yp) / len);
@@ -679,7 +679,7 @@ float QVector3D::length() const
     double len = double(xp) * double(xp) +
                  double(yp) * double(yp) +
                  double(zp) * double(zp);
-    return float(sqrt(len));
+    return float(std::sqrt(len));
 }
 
 /*!