X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperlunicode.pod;h=30a4482260de5b44f3d8ffe67ea0501b2076283c;hb=5ad8ef521b3ffc4e6bbbb9941bc4940d442b56b2;hp=c6866617a29d3187cb2b52d1bc6c852f028bd005;hpb=ee8c7f5465f003860e2347a2946abacac39bd9b9;p=p5sagit%2Fp5-mst-13.2.git
diff --git a/pod/perlunicode.pod b/pod/perlunicode.pod
index c686661..30a4482 100644
--- a/pod/perlunicode.pod
+++ b/pod/perlunicode.pod
@@ -10,7 +10,7 @@ WARNING: The implementation of Unicode support in Perl is incomplete.
The following areas need further work.
-=over
+=over 4
=item Input and Output Disciplines
@@ -157,20 +157,10 @@ C<(?:\PM\pM*)>.
=item *
-The C
operator translates characters instead of bytes. It can also
-be forced to translate between 8-bit codes and UTF-8. For instance, if you
-know your input in Latin-1, you can say:
-
- while (<>) {
- tr/\0-\xff//CU; # latin1 char to utf8
- ...
- }
-
-Similarly you could translate your output with
-
- tr/\0-\x{ff}//UC; # utf8 to latin1 char
-
-No, C doesn't take /U or /C (yet?).
+The C
operator translates characters instead of bytes. Note
+that the C functionality has been removed, as the interface
+was a mistake. For similar functionality see pack('U0', ...) and
+pack('C0', ...).
=item *
@@ -208,6 +198,18 @@ byte-oriented C and C under utf8.
=item *
+The bit string operators C<& | ^ ~> can operate on character data.
+However, for backward compatibility reasons (bit string operations
+when the characters all are less than 256 in ordinal value) one cannot
+mix C<~> (the bit complement) and characters both less than 256 and
+equal or greater than 256. Most importantly, the DeMorgan's laws
+(C<~($x|$y) eq ~$x&~$y>, C<~($x&$y) eq ~$x|~$y>) won't hold.
+Another way to look at this is that the complement cannot return
+B the 8-bit (byte) wide bit complement, and the full character
+wide bit complement.
+
+=item *
+
And finally, C reverses by character rather than by byte.
=back