From: David Reiss <dreiss@apache.org>
Date: Thu, 7 May 2009 00:41:18 +0000 (+0000)
Subject: THRIFT-490. Clarify the comment for the Guard macro
X-Git-Tag: 0.2.0~118
X-Git-Url: https://source.supwisdom.com/gerrit/gitweb?a=commitdiff_plain;h=be378f232b3b4ea5007a6665d3815a63a10ece65;p=common%2Fthrift.git

THRIFT-490. Clarify the comment for the Guard macro

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@772478 13f79535-47bb-0310-9956-ffa450edef68
---

diff --git a/lib/cpp/src/concurrency/Mutex.h b/lib/cpp/src/concurrency/Mutex.h
index 884412be..73c73e0e 100644
--- a/lib/cpp/src/concurrency/Mutex.h
+++ b/lib/cpp/src/concurrency/Mutex.h
@@ -102,6 +102,8 @@ class RWGuard {
 
 
 // A little hack to prevent someone from trying to do "Guard(m);"
+// Such a use is invalid because the temporary Guard object is
+// destoryed at the end of the line, releasing the lock.
 // Sorry for polluting the global namespace, but I think it's worth it.
 #define Guard(m) incorrect_use_of_Guard(m)
 #define RWGuard(m) incorrect_use_of_RWGuard(m)