Initial support for object array semantic. * libinterp/octave-value/ov-classdef.h (class cdef_object_array): New class. (cdef_object_rep::empty_clone, cdef_object_rep::copy, cdef_object_rep::make_array, cdef_object_rep::is_array, cdef_object_rep::array_value): New methods. (cdef_object::empty_clone, cdef_object::make_array, cdef_object::copy, cdef_object::is_array, cdef_object::array_value): Likewise. (cdef_object_base::empty_clone, cdef_object_base::make_array): Likewise. (handle_cdef_object::copy): Likewise. (value_cdef_object::copy): Likewise. (cdef_class::cdef_class_rep::copy, cdef_property::cdef_property_rep::copy, cdef_method::cdef_method_rep::copy, cdef_package::cdef_package_rep::copy): Likewise. (handle_cdef_object::handle_cdef_object): New copy constructor. (cdef_object::make_unique): New method. (cdef_object::subsasgn): Use it. (cdef_class::cdef_class_rep::meta): New member. (cdef_class::cdef_class_rep::cdef_class_rep): Initialize it. (cdef_class::cdef_class_rep::mark_as_meta_class, cdef_class::cdef_class_rep::is_meta): Use and manipulate it. (cdef_class::mark_as_meta_class, cdef_class::is_meta): Likewise. (cdef_class::cdef_class_rep::construct_object, cdef_class::cdef_class_rep::is_abstract, cdef_class::cdef_class_rep::is_sealed): New methods. (cdef_class::construct_object, cdef_class::is_abstract, cdef_class::is_sealed): Likewise. (cdef_class::cdef_class_rep::cdef_class_rep): New copy constructor. (cdef_property::cdef_property_rep::default_value): Remove member. (cdef_property::cdef_property_rep::get_value ()): Use "DefaultValue" slot. (cdef_property::cdef_property_rep::set_value (octave_value)): Remove method. (cdef_property::set_value (octave_value)): Likewise. (cdef_property::cdef_property_rep::cdef_property_rep): New copy constructor. (cdef_method::cdef_method_rep::cdef_method_rep): Likewise. (cdef_package::cdef_package_rep::cdef_package_rep): Likewise. (octave_classdef::empty_clone): Call cdef_object::empty_clone. (octave_classdef::undef_subsasgn): New method. (class cdef_property, class cdef_method, class cdef_package): Mark cdef_class as friend. * libinterp/octave-value/ov-classdef.cc: Include Array.cc. (make_class): Initialize "Abstract" property. Do not register classes with empty name. (make_meta_class): New static function. (make_method): Check whether function object is valid. (make_package): Do not register packages with empty name. (octave_classdef::undef_subsasgn): New method. (class cdef_object_array): New class. (cdef_class::cdef_class_rep::cdef_class_rep): Initialize meta. (cdef_class::cdef_class_rep::find_methods, cdef_class::cdef_class_rep::find_names): Use cdef_method::is_constructor instead of relying on the method name. (cdef_class::cdef_class_rep::construct_object): New method. (cdef_class::cdef_class_rep::construct): Use it. (install_classdef): Use make_meta_class. Create "Abstract" property for class meta.class.

c960be36c9f3f690ceb43057314354e0df736416 gnulib-hg