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>

2 files changed, 4 insertions, 4 deletions

diff --git a/src/corelib/doc/snippets/code/doc_src_qiterator.cpp b/src/corelib/doc/snippets/code/doc_src_qiterator.cpp
index e37212b475..c311db957c 100644
--- a/src/corelib/doc/snippets/code/doc_src_qiterator.cpp
+++ b/src/corelib/doc/snippets/code/doc_src_qiterator.cpp
@@ -257,7 +257,7 @@ while (i.hasNext()) {
 QMutableListIterator<double> i(list);
 while (i.hasNext()) {
     double val = i.next();
-    i.setValue(sqrt(val));
+    i.setValue(std::sqrt(val));
 }
 //! [23]
 
@@ -266,7 +266,7 @@ while (i.hasNext()) {
 QMutableLinkedListIterator<double> i(list);
 while (i.hasNext()) {
     double val = i.next();
-    i.setValue(sqrt(val));
+    i.setValue(std::sqrt(val));
 }
 //! [24]
 
@@ -275,7 +275,7 @@ while (i.hasNext()) {
 QMutableVectorIterator<double> i(list);
 while (i.hasNext()) {
     double val = i.next();
-    i.setValue(sqrt(val));
+    i.setValue(std::sqrt(val));
 }
 //! [25]
 
diff --git a/src/corelib/doc/snippets/code/src_corelib_tools_qpoint.cpp b/src/corelib/doc/snippets/code/src_corelib_tools_qpoint.cpp
index 17a252cc1b..b545c2dad8 100644
--- a/src/corelib/doc/snippets/code/src_corelib_tools_qpoint.cpp
+++ b/src/corelib/doc/snippets/code/src_corelib_tools_qpoint.cpp
@@ -105,7 +105,7 @@ MyWidget::mouseMoveEvent(QMouseEvent *event)
 
 
 //! [8]
-double trueLength = sqrt(pow(x(), 2) + pow(y(), 2));
+double trueLength = std::sqrt(std::pow(x(), 2) + std::pow(y(), 2));
 //! [8]