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*********** DynAny_Test ****************
updated 9/29/98.
All the .h .cpp and .idl files (except da_tests.idl and driver.cpp) have
been moved into TAO. A test suite will be written shortly.
The file da_tests.idl contains some data structures that have been used
for debugging. The file driver.cpp has been
used for this debugging, and the contents of these two files are in
flux.
****************Some things to note about DynUnion:
The spec is vague on the action of set_as_default
and member_name and there seems to be disparity in the interpretation of
the spec by other vendors. In this implementation, they are interpreted
as follows:
set_as_default -
Treated as read-only, the assignment version is included to
override the virtual function, but has an empty body. The
fetch version returns TRUE if the DynUnion has a default
value and that default value is the active member.
member_name
Fetch version just returns the name of the active member. The
assignment version makes active the member with the supplied
name (if it is valid), but does not save the previous value,
so to be meaningful, an insert or assignment should be done
after this operation, since the new active member will be
uninitialized.
If a non-valid label is supplied for initialization or assignment
(in the typecode of an Any supplied to the constructor or to
from_any, for example), and there is a default index, the member
index will be set to the default value and the label will be stored
in the member DynAny holding the descriminator. If there is
not a default index, an exception will be thrown.
For the DynUnion functions next(), seek() and rewind(), a new
uninitialized member will be created and the original will be lost.
I can't see what use these functions have when used with DynUnion,
but a behavior has been defined. If some behavior as yet unforeseen
turns out to be useful, these functions can always be changed.
The spec calls for the seek() function to take an argument of
type Long, which is only one of ten types that a DynUnion label
can have, so the argument to seek() must refer to an index and
not to a label.
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