diff options
author | Perl 5 Porters <perl5-porters@africa.nicoh.com> | 1997-03-26 07:04:34 +1200 |
---|---|---|
committer | Chip Salzenberg <chip@atlantic.net> | 1997-03-26 07:04:34 +1200 |
commit | 54310121b442974721115f93666234a200f5c7e4 (patch) | |
tree | 99b5953030ddf062d77206ac0cf8ac967e7cbd93 /pod/perlref.pod | |
parent | d03407ef6d8e534a414e9ce92c6c5c8dab664a40 (diff) | |
download | perl-54310121b442974721115f93666234a200f5c7e4.tar.gz |
[inseperable changes from patch from perl-5.003_95 to perl-5.003_86]
[editor's note: this commit was prepared manually so may differ in
minor ways to other inseperable changes commits]
CORE LANGUAGE CHANGES
Title: "Support $ENV{PERL5OPT}"
From: Chip Salzenberg
Files: perl.c pod/perldiag.pod pod/perldelta.pod pod/perlrun.pod
Title: "Implement void context, in which C<wantarray> is undef"
From: Chip Salzenberg
Files: cop.h doop.c dump.c global.sym gv.c op.c op.h perl.c
pod/perlcall.pod pod/perldelta.pod pod/perlfunc.pod
pod/perlguts.pod pod/perlsub.pod pp.c pp_ctl.c pp_hot.c
pp_sys.c proto.h
Title: "Don't look up &AUTOLOAD in @ISA when calling plain function"
From: Chip Salzenberg
Files: global.sym gv.c lib/Text/ParseWords.pm pod/perldelta.pod
pp_hot.c proto.h t/op/method.t
Title: "Allow closures to be constant subroutines"
From: Chip Salzenberg
Files: op.c
Title: "Make C<scalar(reverse)> mean C<scalar(reverse $_)>"
From: Chip Salzenberg
Files: pp.c
Title: "Fix lexical suicide from C<my $x = $x> in sub"
From: Chip Salzenberg
Files: op.c
Title: "Make "Unrecog. char." fatal, and update its doc"
From: Chip Salzenberg
Files: pod/perldiag.pod toke.c
CORE PORTABILITY
Title: "safefree() mismatch"
From: Roderick Schertler
Msg-ID: <21338.859653381@eeyore.ibcinc.com>
Date: Sat, 29 Mar 1997 11:36:21 -0500
Files: util.c
(applied based on p5p patch as commit id 9b9b466fb02dc96c81439bafbb3b2da55238cfd2)
Title: "Win32 update (seven patches)"
From: Gurusamy Sarathy and Nick Ing-Simmons
Files: EXTERN.h MANIFEST win32/Makefile win32/perl.mak
win32/perl.rc win32/perldll.mak win32/makedef.pl
win32/modules.mak win32/win32io.c win32/bin/pl2bat.bat
OTHER CORE CHANGES
Title: "Report PERL* environment variables in -V and perlbug"
From: Chip Salzenberg
Files: perl.c utils/perlbug.PL
Title: "Typo in perl.c: Printing NO_EMBED for perl -V"
From: Gisle Aas
Msg-ID: <199703301922.VAA13509@furubotn.sn.no>
Date: Sun, 30 Mar 1997 21:22:11 +0200
Files: perl.c
(applied based on p5p patch as commit id b6c639e4b1912ad03b9b10ba9518d96bd0a6cfaf)
Title: "Don't let C<$var = $var> untaint $var"
From: Chip Salzenberg
Files: pp_hot.c pp_sys.c sv.h t/op/taint.t
Title: "Fix autoviv bug in C<my $x; ++$x->{KEY}>"
From: Chip Salzenberg
Files: pp_hot.c
Title: "Re: 5.004's new srand() default seed"
From: Hallvard B Furuseth
Msg-ID: <199703302219.AAA20998@bombur2.uio.no>
Date: Mon, 31 Mar 1997 00:19:13 +0200 (MET DST)
Files: pp.c
(applied based on p5p patch as commit id d7d933a26349f945f93b2f0dbf85b773d8ca3219)
Title: "Re: embedded perl and top_env problem "
From: Gurusamy Sarathy
Msg-ID: <199703280031.TAA05711@aatma.engin.umich.edu>
Date: Thu, 27 Mar 1997 19:31:42 -0500
Files: gv.c interp.sym perl.c perl.h pp_ctl.c pp_sys.c scope.h util.c
(applied based on p5p patch as commit id f289f7d2518e7a8a82114282e774adf50fa6ce85)
Title: "Define and use new macro: boolSV()"
From: Tim Bunce
Files: gv.c lib/ExtUtils/typemap os2/os2.c pp.c pp_hot.c pp_sys.c
sv.c sv.h universal.c vms/vms.c
Title: "Re: strict @F"
From: Hallvard B Furuseth
Msg-ID: <199703252110.WAA16038@bombur2.uio.no>
Date: Tue, 25 Mar 1997 22:10:33 +0100 (MET)
Files: toke.c
(applied based on p5p patch as commit id dfd44a5c8c8dd4c001c595debfe73d011a96d844)
Title: "Try harder to identify errors at EOF"
From: Chip Salzenberg
Files: toke.c
Title: "Minor string change in toke.c: 'bareword'"
From: lvirden@cas.org
Msg-ID: <1997Mar27.130247.1911552@hmivax.humgen.upenn.edu>
Date: Thu, 27 Mar 1997 13:02:46 -0500 (EST)
Files: toke.c
(applied based on p5p patch as commit id 9b56c8f8085a9e773ad87c6b3c1d0b5e39dbc348)
Title: "Improve diagnostic on \r in program text"
From: Chip Salzenberg
Files: pod/perldiag.pod toke.c
Title: "Make Sock_size_t typedef work right"
From: Chip Salzenberg
Files: perl.h pp_sys.c
LIBRARY AND EXTENSIONS
Title: "New module constant.pm"
From: Tom Phoenix
Files: MANIFEST lib/constant.pm op.c pp.c t/pragma/constant.t
Title: "Remove chat2"
From: Chip Salzenberg
Files: MANIFEST lib/chat2.inter lib/chat2.pl
Title: "Include CGI.pm 2.32"
From: Chip Salzenberg
Files: MANIFEST eg/cgi/* lib/CGI.pm lib/CGI/Apache.pm
lib/CGI/Carp.pm lib/CGI/Fast.pm lib/CGI/Push.pm
lib/CGI/Switch.pm
UTILITIES
Title: "Tom C's Pod::Html and html tools, as of 30 March 97"
From: Chip Salzenberg
Files: MANIFEST installhtml lib/Pod/Html.pm pod/pod2html.PL
Title: "Fix path bugs in installhtml"
From: Robin Barker <rmb1@cise.npl.co.uk>
Msg-ID: <3180.9703270906@tempest.cise.npl.co.uk>
Date: Thu, 27 Mar 97 09:06:14 GMT
Files: installhtml
Title: "Make perlbug say that it's only for core Perl bugs"
From: Chip Salzenberg
Files: utils/perlbug.PL
DOCUMENTATION
Title: "Document autouse and constant; update diagnostics"
From: Chip Salzenberg
Files: pod/perldelta.pod
Title: "Suggest to upgraders that they try '-w' again"
From: Hallvard B Furuseth
Msg-ID: <199703251901.UAA15982@bombur2.uio.no>
Date: Tue, 25 Mar 1997 20:01:26 +0100 (MET)
Files: pod/perldelta.pod
(applied based on p5p patch as commit id 4176c059b9ba6b022e99c44270434a5c3e415b73)
Title: "Improve and update documentation of constant subs"
From: Tom Phoenix <rootbeer@teleport.com>
Msg-ID: <Pine.GSO.3.96.970331122546.14185C-100000@kelly.teleport.com>
Date: Mon, 31 Mar 1997 13:05:54 -0800 (PST)
Files: pod/perlsub.pod
Title: "Improve documentation of C<return>"
From: Chip Salzenberg
Files: pod/perlfunc.pod pod/perlsub.pod
Title: "perlfunc.pod patch"
From: Gisle Aas
Msg-ID: <199703262159.WAA17531@furubotn.sn.no>
Date: Wed, 26 Mar 1997 22:59:23 +0100
Files: pod/perlfunc.pod
(applied based on p5p patch as commit id 35a731fcbcd7860eb497d6598f3f77b8746319c4)
Title: "Use 'while (defined($x = <>)) {}', per <gnat@frii.com>"
From: Chip Salzenberg
Files: configpm lib/Term/Cap.pm perlsh pod/perlipc.pod pod/perlop.pod
pod/perlsub.pod pod/perlsyn.pod pod/perltrap.pod
pod/perlvar.pod win32/bin/search.bat
Title: "Document and test C<%> behavior with negative operands"
From: Chip Salzenberg
Files: pod/perlop.pod t/op/arith.t
Title: "Update docs on $]"
From: Chip Salzenberg
Files: pod/perlvar.pod
Title: "perlvar.pod patch"
From: Gisle Aas
Msg-ID: <199703261254.NAA10237@bergen.sn.no>
Date: Wed, 26 Mar 1997 13:54:00 +0100
Files: pod/perlvar.pod
(applied based on p5p patch as commit id 0aa182cb0caa3829032904b9754807b1b7418509)
Title: "Fix example of C<or> vs. C<||>"
From: Chip Salzenberg
Files: pod/perlsyn.pod
Title: "Pod usage and spelling patch"
From: Larry W. Virden
Files: pod/*.pod
Title: "Pod updates"
From: "Cary D. Renzema" <caryr@mxim.com>
Msg-ID: <199703262353.PAA01819@macs.mxim.com>
Date: Wed, 26 Mar 1997 15:53:22 -0800 (PST)
Files: pod/*.pod
(applied based on p5p patch as commit id 5695b28edc67a3f45e8a0f25755d07afef3660ac)
Diffstat (limited to 'pod/perlref.pod')
-rw-r--r-- | pod/perlref.pod | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/pod/perlref.pod b/pod/perlref.pod index 4a0f14635c..cf793652f7 100644 --- a/pod/perlref.pod +++ b/pod/perlref.pod @@ -24,12 +24,12 @@ object, but we usually reserve the word for references to objects that have been officially "blessed" into a class package.) Symbolic references are names of variables or other objects, just as a -symbolic link in a UNIX filesystem contains merely the name of a file. +symbolic link in a Unix filesystem contains merely the name of a file. The C<*glob> notation is a kind of symbolic reference. (Symbolic references are sometimes called "soft references", but please don't call them that; references are confusing enough without useless synonyms.) -In contrast, hard references are more like hard links in a UNIX file +In contrast, hard references are more like hard links in a Unix file system: They are used to access an underlying object without concern for what its (other) name is. When the word "reference" is used without an adjective, like in the following paragraph, it usually is talking about a @@ -41,14 +41,14 @@ scalar is holding a reference, it always behaves as a simple scalar. It doesn't magically start being an array or hash or subroutine; you have to tell it explicitly to do so, by dereferencing it. -References can be constructed several ways. +References can be constructed in several ways. =over 4 =item 1. By using the backslash operator on a variable, subroutine, or value. -(This works much like the & (address-of) operator works in C.) Note +(This works much like the & (address-of) operator in C.) Note that this typically creates I<ANOTHER> reference to a variable, because there's already a reference to the variable in the symbol table. But the symbol table reference might go away, and you'll still have the @@ -63,7 +63,7 @@ reference that the backslash returned. Here are some examples: It isn't possible to create a true reference to an IO handle (filehandle or dirhandle) using the backslash operator. See the explanation of the *foo{THING} syntax below. (However, you're apt to find Perl code -out there using globrefs as though they were IO handles, which is +out there using globrefs as though they were IO handles, which is grandfathered into continued functioning.) =item 2. @@ -74,7 +74,7 @@ brackets: $arrayref = [1, 2, ['a', 'b', 'c']]; Here we've constructed a reference to an anonymous array of three elements -whose final element is itself reference to another anonymous array of three +whose final element is itself a reference to another anonymous array of three elements. (The multidimensional syntax described later can be used to access this. For example, after the above, C<$arrayref-E<gt>[2][1]> would have the value "b".) @@ -83,10 +83,10 @@ Note that taking a reference to an enumerated list is not the same as using square brackets--instead it's the same as creating a list of references! - @list = (\$a, \@b, \%c); + @list = (\$a, \@b, \%c); @list = \($a, @b, %c); # same thing! -As a special case, C<\(@foo)> returns a list of references to the contents +As a special case, C<\(@foo)> returns a list of references to the contents of C<@foo>, not a reference to C<@foo> itself. Likewise for C<%foo>. =item 3. @@ -143,8 +143,8 @@ context even when it's called outside of the context. In human terms, it's a funny way of passing arguments to a subroutine when you define it as well as when you call it. It's useful for setting up little bits of code to run later, such as callbacks. You can even -do object-oriented stuff with it, though Perl provides a different -mechanism to do that already--see L<perlobj>. +do object-oriented stuff with it, though Perl already provides a different +mechanism to do that--see L<perlobj>. You can also think of closure as a way to write a subroutine template without using eval. (In fact, in version 5.000, eval was the I<only> way to get @@ -298,7 +298,7 @@ Admittedly, it's a little silly to use the curlies in this case, but the BLOCK can contain any arbitrary expression, in particular, subscripted expressions: - &{ $dispatch{$index} }(1,2,3); # call correct routine + &{ $dispatch{$index} }(1,2,3); # call correct routine Because of being able to omit the curlies for the simple case of C<$$x>, people often make the mistake of viewing the dereferencing symbols as @@ -416,7 +416,7 @@ that, you can say use strict 'refs'; and then only hard references will be allowed for the rest of the enclosing -block. An inner block may countermand that with +block. An inner block may countermand that with no strict 'refs'; @@ -429,7 +429,7 @@ invisible to this mechanism. For example: { my $value = 20; print $$ref; - } + } This will still print 10, not 20. Remember that local() affects package variables, which are all "global" to the package. @@ -495,7 +495,7 @@ converted into a string: $x{ \$a } = $a; -If you try to dereference the key, it won't do a hard dereference, and +If you try to dereference the key, it won't do a hard dereference, and you won't accomplish what you're attempting. You might want to do something more like |