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authorPerl 5 Porters <perl5-porters@africa.nicoh.com>1996-11-19 14:16:00 +1200
committerChip Salzenberg <chip@atlantic.net>1996-11-19 14:16:00 +1200
commit55497cffdd24c959994f9a8ddd56db8ce85e1c5b (patch)
tree444dfb8adc0e5b96d56e0532791122c366f50a3e /pod/perlref.pod
parentc822f08a5087943f7d9e2c36ce42ea035f03ab97 (diff)
downloadperl-55497cffdd24c959994f9a8ddd56db8ce85e1c5b.tar.gz
[inseparable changes from patch from perl5.003_07 to perl5.003_08]
CORE LANGUAGE CHANGES Subject: Bitwise op sign rationalization From: Chip Salzenberg <chip@atlantic.net> Files: op.c opcode.pl pod/perlop.pod pod/perltoc.pod pp.c pp.h pp_hot.c proto.h sv.c t/op/bop.t Make bitwise ops result in unsigned values, unless C<use integer> is in effect. Includes initial support for UVs. Subject: Defined scoping for C<my> in control structures From: Chip Salzenberg <chip@atlantic.net> Files: op.c perly.c perly.c.diff perly.h perly.y proto.h toke.c Finally defines semantics of "my" in control expressions, like the condition of "if" and "while". In all cases, scope of a "my" var extends to the end of the entire control structure. Also adds new construct "for my", which automatically declares the control variable "my" and limits its scope to the loop. Subject: Fix ++/-- after int conversion (e.g. 'printf "%d"') From: Chip Salzenberg <chip@atlantic.net> Files: pp.c pp_hot.c sv.c This patch makes Perl correctly ignore SvIVX() if either NOK or POK is true, since SvIVX() may be a truncated or overflowed version of the real value. Subject: Make code match Camel II re: functions that use $_ From: Paul Marquess <pmarquess@bfsec.bt.co.uk> Files: opcode.pl Subject: Provide scalar context on left side of "->" From: Chip Salzenberg <chip@atlantic.net> Files: perly.c perly.y Subject: Quote bearword package/handle FOO in "funcname FOO => 'bar'" From: Chip Salzenberg <chip@atlantic.net> Files: toke.c OTHER CORE CHANGES Subject: Warn on overflow of octal and hex integers From: Chip Salzenberg <chip@atlantic.net> Files: proto.h toke.c util.c Subject: If -w active, warn for commas and hashes ('#') in qw() From: Chip Salzenberg <chip@atlantic.net> Files: toke.c Subject: Fixes for pack('w') From: Ulrich Pfeifer <pfeifer@charly.informatik.uni-dortmund.de> Files: pp.c t/op/pack.t Subject: More complete output from sv_dump() From: Gurusamy Sarathy <gsar@engin.umich.edu> Files: sv.c Subject: Major '..' and debugger patches From: Ilya Zakharevich <ilya@math.ohio-state.edu> Files: lib/perl5db.pl op.c pp_ctl.c scope.c scope.h Subject: Fix for formline() From: Gurusamy Sarathy <gsar@engin.umich.edu> Files: global.sym mg.c perl.h pod/perldiag.pod pp_ctl.c proto.h sv.c t/op/write.t Subject: Fix stack botch in untie and binmode From: Gurusamy Sarathy <gsar@engin.umich.edu> Files: pp_sys.c Subject: Complete EMBED, including symbols from interp.sym From: Chip Salzenberg <chip@atlantic.net> Files: MANIFEST embed.pl ext/DynaLoader/dlutils.c ext/SDBM_File/sdbm/sdbm.h global.sym handy.h malloc.c perl.h pp_sys.c proto.h regexec.c toke.c util.c x2p/Makefile.SH x2p/a2p.h x2p/handy.h x2p/util.h New define EMBEDMYMALLOC makes embedding total by avoiding "Mymalloc" etc. Subject: Support old embedding for people who want it From: Chip Salzenberg <chip@atlantic.net> Files: MANIFEST Makefile.SH old_embed.pl old_global.sym PORTABILITY Subject: Miscellaneous VMS fixes From: Charles Bailey <bailey@HMIVAX.HUMGEN.UPENN.EDU> Files: lib/ExtUtils/Liblist.pm lib/ExtUtils/MM_VMS.pm lib/Math/Complex.pm lib/Time/Local.pm lib/timelocal.pl perl.h perl_exp.SH proto.h t/TEST t/io/read.t t/lib/findbin.t t/lib/getopt.t util.c utils/h2xs.PL vms/Makefile vms/config.vms vms/descrip.mms vms/ext/Stdio/Stdio.pm vms/ext/Stdio/Stdio.xs vms/perlvms.pod vms/test.com vms/vms.c Subject: DJGPP patches (MS-DOS) From: "Douglas E. Wegscheid" <wegscd@whirlpool.com> Files: doio.c dosish.h ext/SDBM_File/sdbm/sdbm.c handy.h lib/AutoSplit.pm lib/Cwd.pm lib/File/Find.pm malloc.c perl.c perl.h pp_sys.c proto.h sv.c util.c Subject: Patch to make Perl work under AmigaOS From: "Norbert Pueschel" <pueschel@imsdd.meb.uni-bonn.de> Files: MANIFEST hints/amigaos.sh installman lib/File/Basename.pm lib/File/Find.pm pod/pod2man.PL pp_sys.c util.c
Diffstat (limited to 'pod/perlref.pod')
-rw-r--r--pod/perlref.pod30
1 files changed, 24 insertions, 6 deletions
diff --git a/pod/perlref.pod b/pod/perlref.pod
index a7c7f438d8..18e355376e 100644
--- a/pod/perlref.pod
+++ b/pod/perlref.pod
@@ -53,8 +53,11 @@ reference that the backslash returned. Here are some examples:
$arrayref = \@ARGV;
$hashref = \%ENV;
$coderef = \&handler;
- $globref = \*STDOUT;
+ $globref = \*foo;
+It isn't possible to create a reference to a filehandle using the
+backslash operator. See the explanation of the *foo{THING} syntax
+below.
=item 2.
@@ -188,22 +191,37 @@ talked about dereferencing yet, we can't show you any examples yet.
=item 7.
-References to filehandles can be created by taking a reference to
-a typeglob. This is currently the best way to pass filehandles into or
-out of subroutines, or to store them in larger data structures.
+A reference can be created by using a special syntax, lovingly known as
+the *foo{THING} syntax. *foo{THING} returns a reference to the THING
+slot in *foo (which is the symbol table entry which holds everything
+known as foo).
- splutter(\*STDOUT);
+ $scalarref = *foo{SCALAR};
+ $arrayref = *ARGV{ARRAY};
+ $hashref = *ENV{HASH};
+ $coderef = *handler{CODE};
+ $fhref = *STDIN{FILEHANDLE};
+ $globref = *foo{GLOB};
+
+Using *foo{FILEHANDLE} is the best way to pass filehandles into or out
+of subroutines, or to store them in larger data structures.
+
+ splutter(*STDOUT{FILEHANDLE});
sub splutter {
my $fh = shift;
print $fh "her um well a hmmm\n";
}
- $rec = get_rec(\*STDIN);
+ $rec = get_rec(*STDIN{FILEHANDLE});
sub get_rec {
my $fh = shift;
return scalar <$fh>;
}
+The best way to do this used to be to use the entire *foo typeglob (or a
+reference to it), so you'll probably come accross old code which does it
+that way.
+
=back
That's it for creating references. By now you're probably dying to