[OctDev] load/save support for user types

[David B. <Dav...@mo...>]

Dear All,

I've committed load/save support for the Galois field type that is useable
with the current octave CVS. This might be the basis for similar support
for the symbolic, sparse, etc user types.

You'll need to include the $(CLASS_HAS_LOAD_SAVE) Makeconf 
variable in your defines for mkoctfile and place the new code 
in "#ifdef CLASS_HAS_LOAD_SAVE ... #endif" to keep backwards 
compatibility. Files to check to the example code are in 
main/comm/ov_galois.h and main/comm/ov_galois.cc and in 
particular the functions save_{ascii,binary,hdf5} and 
load_{ascii,binary,hdf5}. Other examples of these functions
can be found in the octave CVS itself.

One important point to remember with user defined types, is that
the type must be registered prior to the re-loading of the saved
file within octave. That is "octave_foo::register_type ()" must
be called before the load. This can usually be done by using the
type one prior to the load. For the Galois field type an example
would be

octave:1> dummy = gf(1);
octave:2> load test.mat

Now the only thing keeping user types as second class citizens is
the concatenation operators..... :-)

Regards
David

-- 
David Bateman                                Dav...@mo...
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