BUG: Add typemap for std::vector<shared_ptr<XdmfItem> >

When using XPaths from Python, the reader returns a vector of XdmfItems
fitting the XPath description. However, it only returns the base class,
which is useless. This commit adds a typemap in swig to convert the base
classes to the appropriate types in a python list, allowing utilization
of XPaths to from Python.

Xdmf.i

@@ -61,7 +61,7 @@ swig -v -c++ -python -o XdmfPython.cpp Xdmf.i
 
 // Typemaps that work for Java
 
-%typemap(out)  shared_ptr<XdmfItem> {
+%typemap(out) shared_ptr<XdmfItem> {
     if(shared_ptr<XdmfAttribute> value = shared_dynamic_cast<XdmfAttribute>($1)) {
         *(shared_ptr< XdmfAttribute > **)&($result) = value ? new shared_ptr< XdmfAttribute >(value) : 0;
     }
@@ -180,54 +180,70 @@ swig -v -c++ -python -o XdmfPython.cpp Xdmf.i
     from XdmfCore import *
 }
 
-%typemap(out) shared_ptr<XdmfItem> {
-    if(shared_ptr<XdmfAttribute> attribute = shared_dynamic_cast<XdmfAttribute>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfAttribute>(attribute)), SWIGTYPE_p_boost__shared_ptrT_XdmfAttribute_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfCurvilinearGrid> gridCurvilinear = shared_dynamic_cast<XdmfCurvilinearGrid>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfCurvilinearGrid>(gridCurvilinear)), SWIGTYPE_p_boost__shared_ptrT_XdmfCurvilinearGrid_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfDomain> domain = shared_dynamic_cast<XdmfDomain>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfDomain>(domain)), SWIGTYPE_p_boost__shared_ptrT_XdmfDomain_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfGeometry> geometry = shared_dynamic_cast<XdmfGeometry>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfGeometry>(geometry)), SWIGTYPE_p_boost__shared_ptrT_XdmfGeometry_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfGraph> graph = shared_dynamic_cast<XdmfGraph>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfGraph>(graph)), SWIGTYPE_p_boost__shared_ptrT_XdmfGraph_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfGridCollection> gridCollection = shared_dynamic_cast<XdmfGridCollection>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfGridCollection>(gridCollection)), SWIGTYPE_p_boost__shared_ptrT_XdmfGridCollection_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfInformation> information = shared_dynamic_cast<XdmfInformation>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfInformation>(information)), SWIGTYPE_p_boost__shared_ptrT_XdmfInformation_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfMap> map = shared_dynamic_cast<XdmfMap>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfMap>(map)), SWIGTYPE_p_boost__shared_ptrT_XdmfMap_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfRectilinearGrid> gridRectilinear = shared_dynamic_cast<XdmfRectilinearGrid>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfRectilinearGrid>(gridRectilinear)), SWIGTYPE_p_boost__shared_ptrT_XdmfRectilinearGrid_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfRegularGrid> gridRegular = shared_dynamic_cast<XdmfRegularGrid>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfRegularGrid>(gridRegular)), SWIGTYPE_p_boost__shared_ptrT_XdmfRegularGrid_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfSet> set = shared_dynamic_cast<XdmfSet>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfSet>(set)), SWIGTYPE_p_boost__shared_ptrT_XdmfSet_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfTime> time = shared_dynamic_cast<XdmfTime>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfTime>(time)), SWIGTYPE_p_boost__shared_ptrT_XdmfTime_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfTopology> topology = shared_dynamic_cast<XdmfTopology>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfTopology>(topology)), SWIGTYPE_p_boost__shared_ptrT_XdmfTopology_t, SWIG_POINTER_OWN);
-    }
-    else if(shared_ptr<XdmfUnstructuredGrid> gridUnstructured = shared_dynamic_cast<XdmfUnstructuredGrid>($1)) {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfUnstructuredGrid>(gridUnstructured)), SWIGTYPE_p_boost__shared_ptrT_XdmfUnstructuredGrid_t, SWIG_POINTER_OWN);
-    }
-    else {
-        $result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfItem>($1)), SWIGTYPE_p_boost__shared_ptrT_XdmfItem_t, SWIG_POINTER_OWN);
+%fragment("XdmfItemCast", "header") {
+    #include <XdmfSharedPtr.hpp>
+    PyObject * XdmfItemCast(shared_ptr<XdmfItem> obj) {
+        PyObject * result;
+        if(shared_ptr<XdmfAttribute> attribute = shared_dynamic_cast<XdmfAttribute>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfAttribute>(attribute)), SWIGTYPE_p_boost__shared_ptrT_XdmfAttribute_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfCurvilinearGrid> gridCurvilinear = shared_dynamic_cast<XdmfCurvilinearGrid>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfCurvilinearGrid>(gridCurvilinear)), SWIGTYPE_p_boost__shared_ptrT_XdmfCurvilinearGrid_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfDomain> domain = shared_dynamic_cast<XdmfDomain>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfDomain>(domain)), SWIGTYPE_p_boost__shared_ptrT_XdmfDomain_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfGeometry> geometry = shared_dynamic_cast<XdmfGeometry>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfGeometry>(geometry)), SWIGTYPE_p_boost__shared_ptrT_XdmfGeometry_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfGraph> graph = shared_dynamic_cast<XdmfGraph>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfGraph>(graph)), SWIGTYPE_p_boost__shared_ptrT_XdmfGraph_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfGridCollection> gridCollection = shared_dynamic_cast<XdmfGridCollection>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfGridCollection>(gridCollection)), SWIGTYPE_p_boost__shared_ptrT_XdmfGridCollection_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfInformation> information = shared_dynamic_cast<XdmfInformation>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfInformation>(information)), SWIGTYPE_p_boost__shared_ptrT_XdmfInformation_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfMap> map = shared_dynamic_cast<XdmfMap>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfMap>(map)), SWIGTYPE_p_boost__shared_ptrT_XdmfMap_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfRectilinearGrid> gridRectilinear = shared_dynamic_cast<XdmfRectilinearGrid>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfRectilinearGrid>(gridRectilinear)), SWIGTYPE_p_boost__shared_ptrT_XdmfRectilinearGrid_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfRegularGrid> gridRegular = shared_dynamic_cast<XdmfRegularGrid>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfRegularGrid>(gridRegular)), SWIGTYPE_p_boost__shared_ptrT_XdmfRegularGrid_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfSet> set = shared_dynamic_cast<XdmfSet>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfSet>(set)), SWIGTYPE_p_boost__shared_ptrT_XdmfSet_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfTime> time = shared_dynamic_cast<XdmfTime>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfTime>(time)), SWIGTYPE_p_boost__shared_ptrT_XdmfTime_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfTopology> topology = shared_dynamic_cast<XdmfTopology>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfTopology>(topology)), SWIGTYPE_p_boost__shared_ptrT_XdmfTopology_t, SWIG_POINTER_OWN);
+        }
+        else if(shared_ptr<XdmfUnstructuredGrid> gridUnstructured = shared_dynamic_cast<XdmfUnstructuredGrid>(obj)) {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfUnstructuredGrid>(gridUnstructured)), SWIGTYPE_p_boost__shared_ptrT_XdmfUnstructuredGrid_t, SWIG_POINTER_OWN);
+        }
+        else {
+            result = SWIG_NewPointerObj(SWIG_as_voidptr(new shared_ptr<XdmfItem>(obj)), SWIGTYPE_p_boost__shared_ptrT_XdmfItem_t, SWIG_POINTER_OWN);
+        }
+        return result;
     }
 }
 
+%typemap(out, fragment="XdmfItemCast") shared_ptr<XdmfItem> {
+    $result = XdmfItemCast($1);
+}
+
+%typemap(out, fragment="XdmfItemCast") std::vector<shared_ptr<XdmfItem> > {
+    $result = PyList_New($1.size());
+    for(std::vector<shared_ptr<XdmfItem> >::size_type i = 0; i < $1.size(); ++i) {
+        PyList_SetItem($result, i, XdmfItemCast($1[i]));
+    } 
+}
+
 %extend XdmfAttributeCenter {
     bool __eq__(const XdmfAttributeCenter * attributeCenter) {
         return $self == attributeCenter;