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https://issues.apache.org/jira/browse/PROTON-1498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Ross updated PROTON-1498:
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Fix Version/s: proton-c-0.18.0
> [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
> Fix For: proton-c-0.18.0
>
>
> 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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