From: Steve Reinhardt <stever@eecs.umich.edu>
Date: Wed, 16 Mar 2005 00:41:51 +0000 (-0500)
Subject: Add a comment to smartdict.py.
X-Git-Tag: m5_1.0_tutorial~69^2~5^2~5
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=42753edb3c93cbc2ef7a6698b88b20bd641122fe;p=gem5.git

Add a comment to smartdict.py.

python/m5/smartdict.py:
    Add a comment explaining why this actually works.

--HG--
extra : convert_revision : 39cbde547f4bf6cf626ab1c0b6ef56a5788b09b8
---

diff --git a/python/m5/smartdict.py b/python/m5/smartdict.py
index 4ea8210d3..1ba5d8410 100644
--- a/python/m5/smartdict.py
+++ b/python/m5/smartdict.py
@@ -74,6 +74,12 @@ class SmartDict(dict):
             return other / self.convert(other)
 
 
+    # __getitem__ uses dict.get() to return 'False' if the key is not
+    # found (rather than raising KeyError).  Note that this does *not*
+    # set the key's value to 'False' in the dict, so that even after
+    # we call env['foo'] we still get a meaningful answer from "'foo'
+    # in env" (which calls dict.__contains__, which we do not
+    # override).
     def __getitem__(self, key):
         return self.Proxy(dict.get(self, key, 'False'))