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1 | ============================================================================== |
| 2 | Release of version 0.02 of NEXT |
| 3 | ============================================================================== |
| 4 | |
| 5 | |
| 6 | NAME |
| 7 | |
| 8 | NEXT - Pseudo class for method redispatch |
| 9 | |
| 10 | |
| 11 | DESCRIPTION |
| 12 | |
| 13 | NEXT.pm adds a pseudoclass named C<NEXT> to any program that |
| 14 | uses it. If a method C<m> calls C<$self->NEXT::m()>, the call to |
| 15 | C<m> is redispatched as if the calling method had not originally |
| 16 | been found. |
| 17 | |
| 18 | In other words, a call to C<$self->NEXT::m()> resumes the |
| 19 | depth-first, left-to-right search of parent classes that |
| 20 | resulted in the original call to C<m>. |
| 21 | |
| 22 | Note that this is not the same thing as C<$self->SUPER::m()>, which |
| 23 | begins a new dispatch that is restricted to searching the ancestors |
| 24 | of the current class. C<$self->NEXT::m()> can backtrack past |
| 25 | the current class -- to look for a suitable method in other |
| 26 | ancestors of C<$self> -- whereas C<$self->SUPER::m()> cannot. |
| 27 | |
| 28 | An particularly interesting use of redispatch is in |
| 29 | C<AUTOLOAD>'ed methods. If such a method determines that it is |
| 30 | not able to handle a particular call, it may choose to |
| 31 | redispatch that call, in the hope that some other C<AUTOLOAD> |
| 32 | (above it, or to its left) might do better. |
| 33 | |
| 34 | Note that it is a fatal error for any method (including C<AUTOLOAD>) |
| 35 | to attempt to redispatch any method except itself. For example: |
| 36 | |
| 37 | sub D::oops { $_[0]->NEXT::other_method() } # BANG! |
| 38 | |
| 39 | |
| 40 | AUTHOR |
| 41 | |
| 42 | Damian Conway (damian@conway.org) |
| 43 | |
| 44 | |
| 45 | COPYRIGHT |
| 46 | |
| 47 | Copyright (c) 2000-2001, Damian Conway. All Rights Reserved. |
| 48 | This module is free software. It may be used, redistributed |
| 49 | and/or modified under the same terms as Perl itself. |
| 50 | |
| 51 | |
| 52 | ============================================================================== |
| 53 | |
| 54 | CHANGES IN VERSION 0.02 |
| 55 | |
| 56 | |
| 57 | - Fixed setting of $AUTOLOAD in NEXT'd AUTOLOADS (thanks Leonid) |
| 58 | |
| 59 | - Changed licence for inclusion in core distribution |
| 60 | |
| 61 | |
| 62 | ============================================================================== |
| 63 | |
| 64 | AVAILABILITY |
| 65 | |
| 66 | NEXT has been uploaded to the CPAN |
| 67 | and is also available from: |
| 68 | |
| 69 | http://www.csse.monash.edu.au/~damian/CPAN/NEXT.tar.gz |
| 70 | |
| 71 | ============================================================================== |
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