DDS15 — Mapping of OMG IDL to C++ for DDS

The mapping of user written IDL to C++ is not described in the version 1.2 of the DDS standard.

Is it expected that DDS use the existing CORBA C++ mapping for data types? If so then the standard should state this requirement.

On the other hand, the CORBA IDL to C++ mapping is fairly old. The new DDS PSM for C++ would suggest a more modern mapping.

For example, for bounded strings and bounded sequences, C++ classes inspired by the Standard Template Library (STL) could be used. These classes need not necessarily break the DCPS compatibility with the C language mentioned in 8.2.1.1. (Use fixed buffer, avoid virtual methods.) It is not clear whether unbounded data types need be supported, see issues 8892 and 12360.

In case a new mapping is defined which is independent of the CORBA C++ mapping, there is a problem to address:
Bridge applications which use both CORBA and DDS would need to translate a single IDL file twice, once for CORBA and again for DDS. Then there is an overlap in the generated names. This problem could be solved by encapsulating all C++ code generated for DDS from user IDL in an extra namespace.