Acquisition wrappers now correctly proxy `__iter__`.

doc/CHANGES.txt

@@ -237,6 +237,8 @@ Zope Changes
 
     Bugs Fixed
 
+      - Acquisition wrappers now correctly proxy __iter__.
+
       - Launchpad #174705:  ensure that the error info object exposed to a
         'tal:on_error' handler has attributes visible to restricted code.
 

lib/python/Acquisition/_Acquisition.c

@@ -39,7 +39,7 @@ static PyObject *py__add__, *py__sub__, *py__mul__, *py__div__,
   *py__getitem__, *py__setitem__, *py__delitem__,
   *py__getslice__, *py__setslice__, *py__delslice__,  *py__contains__,
   *py__len__, *py__of__, *py__call__, *py__repr__, *py__str__, *py__cmp__,
-  *py__parent__;
+  *py__parent__, *py__iter__;
 
 static PyObject *Acquired=0;
 
@@ -84,6 +84,7 @@ init_py_names(void)
   INIT_PY_NAME(__str__);
   INIT_PY_NAME(__cmp__);
   INIT_PY_NAME(__parent__);
+  INIT_PY_NAME(__iter__);
 #undef INIT_PY_NAME
 }
 
@@ -928,6 +929,12 @@ Wrapper_contains(Wrapper *self, PyObject *v)
   return c;
 }
 
+static PyObject * 
+Wrapper_iter(Wrapper *self)
+{
+  return CallMethodO(OBJECT(self), py__iter__, NULL, NULL); 
+}
+
 static PySequenceMethods Wrapper_as_sequence = {
 	(inquiry)Wrapper_length,		/*sq_length*/
 	(binaryfunc)Wrapper_add,		/*sq_concat*/
@@ -1294,7 +1301,7 @@ static PyExtensionClass Wrappertype = {
   /* tp_clear          */ (inquiry)Wrapper_clear,
   /* tp_richcompare    */ (richcmpfunc)Wrapper_richcompare,
   /* tp_weaklistoffset */ (long)0,
-  /* tp_iter           */ (getiterfunc)0,
+  (getiterfunc)Wrapper_iter,		/*tp_iter*/
   /* tp_iternext       */ (iternextfunc)0,
   /* tp_methods        */ Wrapper_methods,
   /* tp_members        */ 0,
@@ -1338,7 +1345,7 @@ static PyExtensionClass XaqWrappertype = {
   /* tp_clear          */ (inquiry)Wrapper_clear,
   /* tp_richcompare    */ (richcmpfunc)Wrapper_richcompare,
   /* tp_weaklistoffset */ (long)0,
-  /* tp_iter           */ (getiterfunc)0,
+  (getiterfunc)Wrapper_iter,		/*tp_iter*/
   /* tp_iternext       */ (iternextfunc)0,
   /* tp_methods        */ Wrapper_methods,
   /* tp_members        */ 0,

lib/python/Acquisition/tests.py

@@ -1699,6 +1699,9 @@ def test_proxying():
     ...     def __contains__(self, key):
     ...         print 'contains', repr(key)
     ...         return key == 5
+    ...     def __iter__(self):
+    ...         print 'iterating...'
+    ...         return iter((42,))
 
     The naked class behaves like this:
 
@@ -1709,6 +1712,9 @@ def test_proxying():
     >>> 5 in c
     contains 5
     True
+    >>> list(c)
+    iterating...
+    [42]
 
     Let's put c in the context of i:
 
@@ -1723,6 +1729,58 @@ def test_proxying():
     >>> 5 in i.c
     contains 5
     True
+    >>> list(i.c)
+    iterating...
+    [42]
+
+    Let's let's test the same again with an explicit wrapper:
+
+    >>> import Acquisition
+    >>> class Impl(Acquisition.Explicit):
+    ...     pass
+
+    >>> class C(Acquisition.Explicit):
+    ...     def __getitem__(self, key):
+    ...         print 'getitem', key
+    ...         if key == 4:
+    ...             raise IndexError
+    ...         return key
+    ...     def __contains__(self, key):
+    ...         print 'contains', repr(key)
+    ...         return key == 5
+    ...     def __iter__(self):
+    ...         print 'iterating...'
+    ...         return iter((42,))
+
+    The naked class behaves like this:
+
+    >>> c = C()
+    >>> 3 in c
+    contains 3
+    False
+    >>> 5 in c
+    contains 5
+    True
+    >>> list(c)
+    iterating...
+    [42]
+
+    Let's put c in the context of i:
+
+    >>> i = Impl()
+    >>> i.c = c
+
+    Now check that __contains__ is properly used:
+
+    >>> 3 in i.c # c.__of__(i)
+    contains 3
+    False
+    >>> 5 in i.c
+    contains 5
+    True
+    >>> list(i.c)
+    iterating...
+    [42]
 
     """