Re: RFC 193 (v1) Objects : Core support for method delegation

>>>>> "PRL" == Perl6 RFC Librarian <[email protected]> writes:


  PRL> One powerful application of delegation is as a replacement for
  PRL> inheritance where the internals of a prospective base class are
  PRL> inaccessible or inconvenient, or the base class was not designed
  PRL> to be inherited and yet it must be.

isn't this a HAS_A type of relationship? i have plenty of these in my
new project and it is a pain. i can't inherit as the objects are really
not related but one uses the other, e.g. i have a high level obejct with
a socket and a buufered_io object. i don't want to inherit from buffered
i/o since its methods may collide with the main object. but some methods
i want to be able to be passed to buffered i/o and have nothing to do
with the main object. 

  PRL>         sub new {
  PRL>                 my ($class, $infile, $outfile) = @_;
  PRL>                 bless {
  PRL>                         in  => IO::File->new($infile) || die,
  PRL>                         out => IO::File->new("> $outfile") || die,
  PRL>                 }, $class;
  PRL>         }

  PRL>         use Class::Delegation

shouldn't that be use delegation? i think you have a cut and paste
error.


  PRL>                 in  => [qw( getline getlines getc ungetc eof read sysread
  PRL>                            input_record_separator input_line_number )],

what about a way of delegating ALL the methods of an object? any way to
signify that?

	in => 'ALL',

will look up all current methods (maybe tagged?) from the class 'in' and
handle that. then you don't have to update all the delegation calls each
time the 'in' object changes.


i like this RFC a lot. but i like most of damian's stuff. or at least
what i understand. :-)

uri

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