[Exp PyROOT] Make of TIter a Python iterator

bindings/pyroot_experimental/PyROOT/CMakeLists.txt

@@ -17,6 +17,7 @@ set(py_sources
   ROOT/pythonization/_tdirectory.py
   ROOT/pythonization/_tdirectoryfile.py
   ROOT/pythonization/_tfile.py
+  ROOT/pythonization/_titer.py
   ROOT/pythonization/_tobject.py
   ROOT/pythonization/_tseqcollection.py
   ROOT/pythonization/_ttree.py

bindings/pyroot_experimental/PyROOT/python/ROOT/pythonization/_titer.py

+# Author: Enric Tejedor CERN  02/2019
+
+################################################################################
+# Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.                      #
+# All rights reserved.                                                         #
+#                                                                              #
+# For the licensing terms see $ROOTSYS/LICENSE.                                #
+# For the list of contributors see $ROOTSYS/README/CREDITS.                    #
+################################################################################
+
+from ROOT import pythonization
+import cppyy
+
+def _next_pyz(self):
+    # Parameters:
+    # - self: iterator on a collection
+    # Returns:
+    # - next object in the collection, or raises StopIteration if none
+	o = self.Next()
+	if o:
+		return o
+	else:
+		raise StopIteration()
+
+
+@pythonization(lazy = False)
+def pythonize_titer():
+    klass = cppyy.gbl.TIter
+
+    # Make TIter a Python iterable
+    klass.__iter__ = lambda self: self
+
+    # Make TIter a Python iterator
+    klass.__next__ = _next_pyz  # Py3
+    klass.next     = _next_pyz  # Py2
+
+    return True