Mesh: modernize C++11

* remove redundant void-arg
* use nullptr
* replace deprecated headers

src/Mod/Mesh/Gui/ViewProviderMeshPyImp.cpp

@@ -36,7 +36,7 @@
 using namespace MeshGui;
 
 // returns a string which represents the object e.g. when printed in python
-std::string ViewProviderMeshPy::representation(void) const
+std::string ViewProviderMeshPy::representation() const
 {
     std::stringstream str;
     str << "<View provider object at " << getViewProviderDocumentObjectPtr() << ">";
@@ -48,7 +48,7 @@ PyObject* ViewProviderMeshPy::setSelection(PyObject *args)
 {
     PyObject* obj;
     if (!PyArg_ParseTuple(args, "O", &obj))
-        return 0;
+        return nullptr;
 
     Py::Sequence list(obj);
     std::vector<Mesh::FacetIndex> selection;
@@ -68,7 +68,7 @@ PyObject* ViewProviderMeshPy::addSelection(PyObject *args)
 {
     PyObject* obj;
     if (!PyArg_ParseTuple(args, "O", &obj))
-        return 0;
+        return nullptr;
 
     Py::Sequence list(obj);
     std::vector<Mesh::FacetIndex> selection;
@@ -88,7 +88,7 @@ PyObject* ViewProviderMeshPy::removeSelection(PyObject *args)
 {
     PyObject* obj;
     if (!PyArg_ParseTuple(args, "O", &obj))
-        return 0;
+        return nullptr;
 
     Py::Sequence list(obj);
     std::vector<Mesh::FacetIndex> selection;
@@ -107,7 +107,7 @@ PyObject* ViewProviderMeshPy::removeSelection(PyObject *args)
 PyObject* ViewProviderMeshPy::invertSelection(PyObject *args)
 {
     if (!PyArg_ParseTuple(args, ""))
-        return 0;
+        return nullptr;
 
     ViewProviderMesh* vp = getViewProviderMeshPtr();
     vp->invertSelection();
@@ -117,7 +117,7 @@ PyObject* ViewProviderMeshPy::invertSelection(PyObject *args)
 PyObject* ViewProviderMeshPy::clearSelection(PyObject *args)
 {
     if (!PyArg_ParseTuple(args, ""))
-        return 0;
+        return nullptr;
 
     ViewProviderMesh* vp = getViewProviderMeshPtr();
     vp->clearSelection();
@@ -128,7 +128,7 @@ PyObject* ViewProviderMeshPy::highlightSegments(PyObject *args)
 {
     PyObject* list;
     if (!PyArg_ParseTuple(args, "O", &list))
-        return 0;
+        return nullptr;
 
     App::PropertyColorList colors;
     colors.setPyObject(list);
@@ -140,7 +140,7 @@ PyObject* ViewProviderMeshPy::highlightSegments(PyObject *args)
 
 PyObject *ViewProviderMeshPy::getCustomAttributes(const char* /*attr*/) const
 {
-    return 0;
+    return nullptr;
 }
 
 int ViewProviderMeshPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)