projects / OpenSPARC-T2-DV / blame
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1 | ============================================================================== |
| 2 | Release of version 0.50 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 | A 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 | The module also allows you to specify that multiply inherited | |
| 35 | methods should only be redispatched once, and what should | |
| 36 | happen if no redispatch is possible. | |
| 37 | ||
| 38 | ||
| 39 | AUTHOR | |
| 40 | ||
| 41 | Damian Conway (damian@conway.org) | |
| 42 | ||
| 43 | ||
| 44 | COPYRIGHT | |
| 45 | ||
| 46 | Copyright (c) 2000-2001, Damian Conway. All Rights Reserved. | |
| 47 | This module is free software. It may be used, redistributed | |
| 48 | and/or modified under the same terms as Perl itself. | |
| 49 | ||
| 50 | ||
| 51 | ============================================================================== | |
| 52 | ||
| 53 | CHANGES IN VERSION 0.50 | |
| 54 | ||
| 55 | ||
| 56 | - Added a $VERSION (oops!) | |
| 57 | ||
| 58 | - Fixed handling of diamond patterns (thanks Paul) | |
| 59 | ||
| 60 | - Added NEXT::ACTUAL to require existence of next method (thanks Paul) | |
| 61 | ||
| 62 | - Added NEXT::UNSEEN to avoid calling multiply inherited | |
| 63 | methods twice (thanks Paul) | |
| 64 | ||
| 65 | - Re-fixed setting of $AUTOLOAD in NEXT'd AUTOLOADS to be | |
| 66 | consistent with more useful SUPER:: behaviour | |
| 67 | ||
| 68 | - Corified tests | |
| 69 | ||
| 70 | ||
| 71 | ============================================================================== | |
| 72 | ||
| 73 | AVAILABILITY | |
| 74 | ||
| 75 | NEXT has been uploaded to the CPAN | |
| 76 | and is also available from: | |
| 77 | ||
| 78 | http://www.csse.monash.edu.au/~damian/CPAN/NEXT.tar.gz | |
| 79 | ||
| 80 | ============================================================================== |