[jira] [Assigned] (PROTON-1498) [C++ binding] Message annotation_map works as value, but not as ref

["Alan Conway (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PROTON-1498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Conway reassigned PROTON-1498:
-----------------------------------

    Assignee: Alan Conway  (was: Cliff Jansen)

> [C++ binding] Message annotation_map works as value, but not as ref
> -------------------------------------------------------------------
>
>                 Key: PROTON-1498
>                 URL: https://issues.apache.org/jira/browse/PROTON-1498
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: cpp-binding
>            Reporter: Kim van der Riet
>            Assignee: Alan Conway
>
> When fetching a known message annotation from a message {{msg}} which has type {{uint8_t}}, the following call fails:
> {code}
> uint8_t t = msg.message_annotations().get(proton::symbol("x-opt-jms-msg-type")).get<int8_t>();
> {code}
> with {{proton::conversion_error}} "no more data".
> It appears that if the {{annotation_map}} is used as a reference rather than as a value, then this error occurs. If a local copy of the {{annotation_map}} is created, then the {{get()}} calls work ok.
> To test this, the above call was broken out as follows:
> {code}
> proton::message::annotation_map& am_ref = msg.message_annotations();
> uint8_t t = am_ref.get(proton::symbol("x-opt-jms-msg-type")).get<int8_t>();
> {code}
> fails as before, but
> {code}
> proton::message::annotation_map am_val = msg.message_annotations();
> uint8_t t = am_val.get(proton::symbol("x-opt-jms-msg-type")).get<int8_t>();
> {code}
> works ok.



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