Create collection type value objects without an open connection

You can create collection type value objects without an open connection by using a process similar to creating row types. As with row types, ITDatum::Data() and ITDatum::SetData() cannot be used to retrieve or modify values from a collection type created without an open connection.

The following example illustrates how to create a collection type value object without an open connection:

    #include <iostream.h>
    #include <it.h>
    int
    main()
    {
             ITConnection conn;
             ITMVDesc desc;
             ITTypeInfo memberType(conn,"integer", 4,-1,-1,-1,1);
             ITTypeInfo newti( conn, "set(integer not null)",
             "set", memberType, NULL );
             desc.vf_origtypeinfo = (ITTypeInfo *) &newti;
             desc.vf_connection = &conn;
             desc.vf_typedesc = NULL;
             desc.vf_preservedata = NULL;
             desc.vf_outerunknown = NULL;
             desc.vf_datalength = newti.Size();
             desc.vf_libmivaluetype = MI_NULL_VALUE;
             desc.vf_data = NULL;
             ITValue *val = ITFactoryList::DatumToValue (desc);
             val->FromPrintable("set{1}");
             cout << val->Printable() << endl;
             val->Release();
    }