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1 | =head1 NAME |
| 2 | |
| 3 | perldelta - what is new for perl v5.9.2 |
| 4 | |
| 5 | =head1 DESCRIPTION |
| 6 | |
| 7 | This document describes differences between the 5.9.1 and the 5.9.2 |
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8 | development releases. See L<perl590delta> and L<perl591delta> for the |
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9 | differences between 5.8.0 and 5.9.1. |
| 10 | |
| 11 | =head1 Incompatible Changes |
| 12 | |
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13 | =head2 Packing and UTF-8 strings |
| 14 | |
| 15 | The semantics of pack() and unpack() regarding UTF-8-encoded data has been |
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16 | changed. Processing is now by default character per character instead of |
| 17 | byte per byte on the underlying encoding. Notably, code that used things |
| 18 | like C<pack("a*", $string)> to see through the encoding of string will now |
| 19 | simply get back the original $string. Packed strings can also get upgraded |
| 20 | during processing when you store upgraded characters. You can get the old |
| 21 | behaviour by using C<use bytes>. |
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22 | |
| 23 | To be consistent with pack(), the C<C0> in unpack() templates indicates |
| 24 | that the data is to be processed in character mode, i.e. character by |
| 25 | character; at the contrary, C<U0> in unpack() indicates UTF-8 mode, where |
| 26 | the packed string is processed in its UTF-8-encoded Unicode form on a byte |
| 27 | by byte basis. This is reversed with regard to perl 5.8.X. |
| 28 | |
| 29 | Moreover, C<C0> and C<U0> can also be used in pack() templates to specify |
| 30 | respectively character and byte modes. |
| 31 | |
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32 | C<C0> and C<U0> in the middle of a pack or unpack format now switch to the |
| 33 | specified encoding mode, honoring parens grouping. Previously, parens were |
| 34 | ignored. |
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35 | |
| 36 | Also, there is a new pack() character format, C<W>, which is intended to |
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37 | replace the old C<C>. C<C> is kept for unsigned chars coded as bytes in |
| 38 | the strings internal representation. C<W> represents unsigned (logical) |
| 39 | character values, which can be greater than 255. It is therefore more |
| 40 | robust when dealing with potentially UTF-8-encoded data (as C<C> will wrap |
| 41 | values outside the range 0..255, and not respect the string encoding). |
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42 | |
| 43 | In practice, that means that pack formats are now encoding-neutral, except |
| 44 | C<C>. |
| 45 | |
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46 | =head1 Core Enhancements |
| 47 | |
| 48 | =head1 Modules and Pragmata |
| 49 | |
| 50 | =head1 Utility Changes |
| 51 | |
| 52 | =head1 Documentation |
| 53 | |
| 54 | =head1 Performance Enhancements |
| 55 | |
| 56 | =head1 Installation and Configuration Improvements |
| 57 | |
| 58 | =head1 Selected Bug Fixes |
| 59 | |
| 60 | =head1 New or Changed Diagnostics |
| 61 | |
| 62 | =head1 Changed Internals |
| 63 | |
| 64 | =head1 Known Problems |
| 65 | |
| 66 | =head2 Platform Specific Problems |
| 67 | |
| 68 | =head1 Reporting Bugs |
| 69 | |
| 70 | If you find what you think is a bug, you might check the articles |
| 71 | recently posted to the comp.lang.perl.misc newsgroup and the perl |
| 72 | bug database at http://bugs.perl.org/ . There may also be |
| 73 | information at http://www.perl.org/ , the Perl Home Page. |
| 74 | |
| 75 | If you believe you have an unreported bug, please run the B<perlbug> |
| 76 | program included with your release. Be sure to trim your bug down |
| 77 | to a tiny but sufficient test case. Your bug report, along with the |
| 78 | output of C<perl -V>, will be sent off to perlbug@perl.org to be |
| 79 | analysed by the Perl porting team. |
| 80 | |
| 81 | =head1 SEE ALSO |
| 82 | |
| 83 | The F<Changes> file for exhaustive details on what changed. |
| 84 | |
| 85 | The F<INSTALL> file for how to build Perl. |
| 86 | |
| 87 | The F<README> file for general stuff. |
| 88 | |
| 89 | The F<Artistic> and F<Copying> files for copyright information. |
| 90 | |
| 91 | =cut |
projects / p5sagit/p5-mst-13.2.git / blame