[jira] Commented: (THRIFT-490) What are the intended uses for Guard and RWGuard (defined in Mutex.h)

["David Reiss (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/THRIFT-490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706653#action_12706653 ] 

David Reiss commented on THRIFT-490:
------------------------------------

You've got it right.  The macros are to prevent uses like...

{code}
{
  Guard(myMutex);
  useSharedStructure();
}
{code}

which is invalid because the temporary Guard object is destroyed before the call to useSharedStructure.

> What are the intended uses for Guard and RWGuard (defined in Mutex.h)
> ---------------------------------------------------------------------
>
>                 Key: THRIFT-490
>                 URL: https://issues.apache.org/jira/browse/THRIFT-490
>             Project: Thrift
>          Issue Type: Question
>          Components: Library (C++)
>    Affects Versions: 0.1
>         Environment: Mac OS X 10.5.6
>            Reporter: Rush Manbert
>
> The Guard and RWGuard classes are defined much like the Synchronized class, but there are also two macros defined, Guard(m) and RWGuard(m) which cause a compile error if you try to declare a Guard or RWGuard on the stack.
> To me, these look like scoped  mutex locks that would be used like this:
> {
>     Guard g(myMutex);
> }
> which is again just like the use of Synchronized.
> Have I missed something? What is the intended usage for these classes? I need to know because I'm writing tests for them so I can test my Boost Mutex and ReadWriteMutex implementations.

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