DDSPSMC11_ — Provide extension constructors for standard classes

The specification does not seem to provide any "standard" way to pass vendor-specific arguments to constructors of standard classes. As constructor is a special function, the trick of overloading operator -> (used for vendor-specific member functions) does not work.

Take DataState for example: We need to pass more that just InstanceState, ViewState, and SampleState.

Proposed Resolution: (1) Add overly-generic template constructors that accepts any number of generic arguments. For instance,

template <class Arg1, class Arg2, class Arg3>
Class(Arg1 &, Arg2 &, Arg3 &);

Some classes like DataState may be extended with operator >> template. This style is used in DataReaderQos and DataWriterQos.

RTI is not thrilled about this option. However, it may solve similar problems in all the classes that need vendor-specific constructors.

Alternatively, (2) Allow vendor-specific constructors and member-functions in standard classes. The standard simply needs to say that it is allowed.