#4 hash __self__ when calculating function hashes

fcache/fcache.py

@@ -17,7 +17,8 @@ def decorated(*args, **kwargs):
             f_closure_values = tuple(map(lambda c: c.cell_contents, f.__closure__))
         else:
             f_closure_values = None
-        call_hash = stable_hash((f, args, kwargs, f_closure_values))
+        bounded_obj = getattr(f, '__self__', None)
+        call_hash = stable_hash((f, args, kwargs, f_closure_values, bounded_obj))
         if call_hash in cache:
             return cache[call_hash]
         else:

fcache/tests/test_caching_functions.py

@@ -116,7 +116,25 @@ def get():
     assert cached_res == get_res
     assert cached_res is not get_res
 
-# TODO Test class function
+
+# Test class function
+class SimpleClass:
+    def __init__(self):
+        self.n = 0
+    def inc(self):
+        self.n += 1
+    def get(self):
+        return self.n
+
+def test_bound_method():
+    obj = SimpleClass()
+    fun = fcache(obj.get)
+    assert fun() == 0
+    obj.inc()
+    obj.inc()
+    assert fun() == 2
+
+
 # TODO Test well behaived
 
 # Test with numpy and pandas - in a separate file