[jira] [Created] (PROTON-1288) c++ provide access to message maps as proton::value

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

Alan Conway created PROTON-1288:
-----------------------------------

             Summary: c++ provide access to message maps as proton::value
                 Key: PROTON-1288
                 URL: https://issues.apache.org/jira/browse/PROTON-1288
             Project: Qpid Proton
          Issue Type: Bug
          Components: cpp-binding
    Affects Versions: 0.14.0
            Reporter: Alan Conway
            Assignee: Alan Conway
             Fix For: 0.15.0


We need to provide access to the message property maps as a proton::value. 

Given
{code}
    std::map<string, scalar> my_map;
    proton::message m;
{code}

Here are some options:

1. Add new message accessor: proton::value& properties_value()
   proton::get(m.properties_value(), my_map)

2. Add value() accessor to cached_map
   proton::get(m.properties().value(), my_map)

3. Make cached_map : public proton::value()
   proton::get(m.properties(), my_map)

3 is neatest, 1 provides a clearer separation between the case where you want a convenient cached map vs. you want to decode to your own C++ map, work on it, and possibly re-encode it later. I lean towards 3. but open to persuasion.



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