Implement embryonic value-class semantic. * libinterp/octave-value/ov-classdef.h (cdef_object_rep::set_class): Delete method. (cdef_object_rep::get, cdef_object_rep::put): Copy implementation from handle_cdef_object. (cdef_object_rep::subsref, cdef_oject_rep::subsasgn): Move implementation to source file. (cdef_object_rep::map): Copy field from handle_cdef_object. (handle_cdef_rep::get, handle_cdef_rep::put): Move implementation to cdef_object_rep. (handle_cdef_rep::map): Move field to cdef_object_rep. (cdef_object_rep::cdef_object_rep, cdef_object_rep::operator=): Private declaration to disable copying. (handle_cdef_rep::handle_cdef_rep, handle_cdef_rep::operator=): Likewise. (class value_cdef_object): New class for value-class semantic. * libinterp/octave-value/ov-classdef.cc (cdef_object_rep::subsref, cdef_object_rep::subsasgn): Copy implementation from handle_cdef_object. (cdef_class_rep::run_constructor): Do not try to assign constructor result in case of error. (cdef_class_rep::construct): Create value_cdef_object object for value classes.

gnulib = [git]git://git.sv.gnu.org/gnulib