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Posted to dev@qpid.apache.org by "Andrew Stitcher (JIRA)" <ji...@apache.org> on 2016/07/29 22:40:20 UTC
[jira] [Assigned] (PROTON-1241) proton::messaging_handler is not
copyable (because it contains a pn_unique_ptr)
[ https://issues.apache.org/jira/browse/PROTON-1241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Stitcher reassigned PROTON-1241:
---------------------------------------
Assignee: Andrew Stitcher (was: Cliff Jansen)
> proton::messaging_handler is not copyable (because it contains a pn_unique_ptr)
> -------------------------------------------------------------------------------
>
> Key: PROTON-1241
> URL: https://issues.apache.org/jira/browse/PROTON-1241
> Project: Qpid Proton
> Issue Type: Bug
> Components: cpp-binding
> Reporter: Andrew Stitcher
> Assignee: Andrew Stitcher
> Fix For: 0.14.0
>
>
> One fundamental of the Proton C++ API is that the user supplies their own handler class.
> We should strive in our implementation to limit the API user as little as possible. Unfortunately , because of some historical implementation decisions the messaging_handler class contains a single member which is not copyable (this is a unique_ptr to the associated internal messaging_adapter).
> This stops the user being able to natural things with her own classes like:
> {noformat}
> class MyHandler: public messaging_handler {
> ...
> }
> ...
> auto h = MyHandler{};
> ...
> Myhandler g;
> auto i = g;
> {noformat}
> The user knows what she wants to do with her classes and there is no real intrinsic requirement for the messaging_handler to keep hold of a messaging_adapter. So we need to get out of the users way and remove the pn_unique_ptr from messaging_handler.
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