Implement proxying of hash function for C implementation of object proxy.

src/_wrappers.c

@@ -190,6 +190,18 @@ static void WraptObjectProxy_dealloc(WraptObjectProxyObject *self)
 
 /* ------------------------------------------------------------------------- */
 
+static long WraptObjectProxy_hash(WraptObjectProxyObject *self)
+{
+    if (!self->wrapped) {
+      PyErr_SetString(PyExc_ValueError, "wrapper has not been initialised");
+      return -1;
+    }
+
+    return PyObject_Hash(self->wrapped);
+}
+
+/* ------------------------------------------------------------------------- */
+
 static PyObject *WraptObjectProxy_call(
         WraptObjectProxyObject *self, PyObject *args, PyObject *kwds)
 {
@@ -509,7 +521,7 @@ PyTypeObject WraptObjectProxy_Type = {
     0,                      /*tp_as_number*/
     0,                      /*tp_as_sequence*/
     0,                      /*tp_as_mapping*/
-    0,                      /*tp_hash*/
+    (hashfunc)WraptObjectProxy_hash, /*tp_hash*/
     (ternaryfunc)WraptObjectProxy_call, /*tp_call*/
     0,                      /*tp_str*/
     (getattrofunc)WraptObjectProxy_getattro, /*tp_getattro*/

tests/test_object_proxy.py

@@ -620,7 +620,6 @@ class TestIterObjectProxy(unittest.TestCase):
 class TestContextManagerObjectProxy(unittest.TestCase):
 
     def test_context_manager(self):
-
         class Class(object):
             def __enter__(self):
                 return self
@@ -634,5 +633,14 @@ class TestContextManagerObjectProxy(unittest.TestCase):
         with wrapper:
             pass
 
+class TestEqualityObjectProxy(unittest.TestCase):
+
+    def test_object_hash(self):
+        def function1(*args, **kwargs):
+            return args, kwargs
+        function2 = wrapt.ObjectProxy(function1)
+
+        self.assertEqual(hash(function2), hash(function1))
+
 if __name__ == '__main__':
     unittest.main()