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authorPerl 5 Porters <perl5-porters@africa.nicoh.com>1996-12-19 16:44:00 +1200
committerChip Salzenberg <chip@atlantic.net>1996-12-19 16:44:00 +1200
commit5f05dabc4054964aa3b10f44f8468547f051cdf8 (patch)
tree7bcc2c7b6d5cf44e7f0111bac2240ca979d9c804 /pod/perldsc.pod
parent6a3992aa749356d657a4c0e14be8c2f4c2f4f999 (diff)
downloadperl-5f05dabc4054964aa3b10f44f8468547f051cdf8.tar.gz
[inseparable changes from patch from perl5.003_11 to perl5.003_12]
CORE LANGUAGE CHANGES Subject: Support C<delete @hash{@keys}> From: Chip Salzenberg <chip@atlantic.net> Files: op.c op.h opcode.pl pod/perldiag.pod pod/perlfunc.pod pp.c t/op/delete.t Subject: Autovivify scalars From: Chip Salzenberg <chip@atlantic.net> Files: dump.c op.c op.h pp.c pp_hot.c DOCUMENTATION Subject: Update pods: perldelta -> perlnews, perli18n -> perllocale From: Tom Christiansen <tchrist@perl.com> Files: MANIFEST pod/perl.pod pod/perldelta.pod pod/perli18n.pod pod/perlnews.pod Subject: perltoot.pod Date: Mon, 09 Dec 1996 07:44:10 -0700 From: Tom Christiansen <tchrist@mox.perl.com> Files: MANIFEST pod/perltoot.pod Msg-ID: <199612091444.HAA09947@toy.perl.com> (applied based on p5p patch as commit 32e22efaa9ec59b73a208b6c532a0b435e2c6462) Subject: Perlguts, version 25 Date: Fri, 6 Dec 96 11:40:27 PST From: Jeff Okamoto <okamoto@hpcc123.corp.hp.com> Files: pod/perlguts.pod private-msgid: <199612061940.AA055461228@hpcc123.corp.hp.com> Subject: pod patches for English errors Date: Mon, 09 Dec 1996 13:33:11 -0800 From: Steve Kelem <steve.kelem@xilinx.com> Files: pod/*.pod Msg-ID: <24616.850167191@castor> (applied based on p5p patch as commit 0135f10892ed8a21c4dbd1fca21fbcc365df99dd) Subject: Misc doc updates Date: Sat, 14 Dec 1996 18:56:33 -0700 From: Tom Christiansen <tchrist@mox.perl.com> Files: pod/* Subject: Re: perldelta.pod Here are some diffs to the _11 pods. I forgot to add perldelta to perl.pod though. And *PLEASE* fix the Artistic License so it no longer has the bogus "whomever" misdeclined in the nominative case: under the copyright of this Package, but belong to whomever generated them, and may be sold commercially, and may be aggregated with this It should obviously be "whoever". p5p-msgid: <199612150156.SAA12506@mox.perl.com> OTHER CORE CHANGES Subject: Allow assignment to empty array values during foreach() From: Chip Salzenberg <chip@atlantic.net> Files: cop.h global.sym mg.c op.c perl.h pp_hot.c proto.h sv.c Subject: Fix nested closures From: Chip Salzenberg <chip@atlantic.net> Files: op.c opcode.pl pp.c pp_ctl.c pp_hot.c Subject: Fix core dump on auto-vivification From: Chip Salzenberg <chip@atlantic.net> Files: pp_hot.c Subject: Fix core dump on C<open $undef_var, "X"> From: Chip Salzenberg <chip@atlantic.net> Files: pp_sys.c Subject: Fix -T/-B on globs and globrefs From: Chip Salzenberg <chip@atlantic.net> Files: pp_sys.c Subject: Fix memory management of $`, $&, and $' From: Chip Salzenberg <chip@atlantic.net> Files: pp_hot.c regexec.c Subject: Fix paren matching during backtracking From: Chip Salzenberg <chip@atlantic.net> Files: regexec.c Subject: Fix memory leak and std{in,out,err} death in perl_{con,de}str From: Chip Salzenberg <chip@atlantic.net> Files: miniperlmain.c perl.c perl.h sv.c Subject: Discard garbage bytes at end of prototype() From: Chip Salzenberg <chip@atlantic.net> Files: pp.c Subject: Fix local($pack::{foo}) From: Chip Salzenberg <chip@atlantic.net> Files: global.sym pp.c pp_hot.c proto.h scope.c Subject: Disable warn, die, and parse hooks _before_ global destruction From: Chip Salzenberg <chip@atlantic.net> Files: perl.c Subject: Re: Bug in formline Date: Sun, 08 Dec 1996 14:58:32 -0500 From: Gurusamy Sarathy <gsar@engin.umich.edu> Files: pp_ctl.c Msg-ID: <199612081958.OAA26025@aatma.engin.umich.edu> (applied based on p5p patch as commit b386bda18108ba86d0b76ebe2d8745eafa80f39e) Subject: Fix C<@a = ($a,$b,$c,$d) = (1,2)> From: Chip Salzenberg <chip@atlantic.net> Files: pp_hot.c Subject: Properly support and document newRV{,_inc,_noinc} From: Chip Salzenberg <chip@atlantic.net> Files: global.sym pod/perlguts.pod sv.c sv.h Subject: Allow lvalue pos inside recursive function From: Chip Salzenberg <chip@atlantic.net> Files: op.c pp.c pp_ctl.c pp_hot.c PORTABILITY Subject: Make $privlib contents compatible with 5.003 From: Chip Salzenberg <chip@atlantic.net> Files: INSTALL ext/Opcode/Safe.pm installperl lib/FileHandle.pm lib/Test/Harness.pm Subject: Support $bincompat3 config variable; update metaconfig units From: Chip Salzenberg <chip@atlantic.net> Files: Configure MANIFEST compat3.sym config_h.SH embed.pl global.sym old_embed.pl old_global.sym old_perl_exp.SH perl_exp.SH Subject: Look for gettimeofday() in Configure Date: Wed, 11 Dec 1996 15:49:57 +0100 From: John Hughes <john@AtlanTech.COM> Files: Configure config_H config_h.SH pp.c Subject: perl5.003_11, Should base use of gettimeofday on HAS_GETTIMEOFDAY, not I_SYS_TIME I've been installing perl5.003_11 on a SCO system that has the TCP/IP runtime installed but not the TCP/IP development system. Unfortunately the <sys/time.h> include file is included in the TCP/IP runtime while libsocket.a is in the development system. This means that pp.c decides to use "gettimeofday" because <sys/time.h> is present but I can't link the perl that gets compiled. So, here's a patch to base the use of "gettimeofday" on "HAS_GETTIMEOFDAY" instead of "I_SYS_TIME". I also took the liberty of removing the special case for plan9 (I assume plan9 has <sys/time.h> but no gettimeofday. Am I right?). p5p-msgid: <01BBE77A.F6F37F80@malvinas.AtlanTech.COM> Subject: Make $startperl a relative path if people want portable scrip From: Chip Salzenberg <chip@atlantic.net> Files: Configure Subject: Homogenize use of "eval exec" hack From: Chip Salzenberg <chip@atlantic.net> Files: Porting/Glossary eg/README eg/nih eg/sysvipc/ipcmsg eg/sysvipc/ipcsem eg/sysvipc/ipcshm lib/diagnostics.pm makeaperl.SH pod/checkpods.PL pod/perlrun.pod pod/pod2html.PL pod/pod2latex.PL pod/pod2man.PL pod/pod2text.PL utils/c2ph.PL utils/h2ph.PL utils/h2xs.PL utils/perlbug.PL utils/perldoc.PL utils/pl2pm.PL x2p/a2py.c x2p/find2perl.PL x2p/s2p.PL Subject: LynxOS support Date: Thu, 12 Dec 1996 09:25:00 PST From: Greg Seibert <seibert@Lynx.COM> Files: Configure MANIFEST hints/lynxos.sh t/op/stat.t Msg-ID: <m0vYEsY-0000IZC@kzinti.lynx.com> (applied based on p5p patch as commit 6693373533b15e559fd8f0f1877e5e6ec15483cc) Subject: Re: db-recno.t failures with _11 on Freebsd 2.1-stable Date: 11 Dec 1996 18:58:56 -0500 From: Roderick Schertler <roderick@gate.net> Files: INSTALL hints/freebsd.sh Msg-ID: <pzohg0r5tr.fsf@eeyore.ibcinc.com> (applied based on p5p patch as commit 10e40321ee752c58e3407b204c74c8049894cb51) Subject: VMS patches to 5.003_11 Date: Mon, 09 Dec 1996 23:16:10 -0500 (EST) From: Charles Bailey <bailey@HMIVAX.HUMGEN.UPENN.EDU> Files: MANIFEST regexec.c t/lib/filehand.t util.c vms/* private-msgid: <01ICTR32LCZG001A1D@hmivax.humgen.upenn.edu> TESTING Subject: recurse recurse recurse ... Date: Mon, 9 Dec 1996 23:44:27 +0200 (EET) From: Jarkko Hietaniemi <jhi@cc.hut.fi> Files: MANIFEST t/op/recurse.t private-msgid: <199612092144.XAA29025@alpha.hut.fi> UTILITIES, LIBRARY, AND EXTENSIONS Subject: Add CPAN and Net::FTP From: Chip Salzenberg <chip@atlantic.net> Files: MANIFEST lib/CPAN.pm lib/CPAN/FirstTime.pm lib/CPAN/Nox.pm lib/Net/FTP.pm lib/Net/Netrc.pm lib/Net/Socket.pm pod/perlmod.pod Subject: Add File::Compare Date: Mon, 16 Dec 1996 18:44:59 GMT From: Nick Ing-Simmons <nik@tiuk.ti.com> Files: MANIFEST lib/File/Compare.pm pod/perlmod.pod Msg-ID: <199612161844.SAA02152@pluto> (applied based on p5p patch as commit ec971c5c328aca84fb827f69f2cc1dc3be81f830) Subject: Add Tie::RefHash Date: Sun, 15 Dec 1996 18:58:08 -0500 From: Gurusamy Sarathy <gsar@engin.umich.edu> Files: MANIFEST lib/Tie/RefHash.pm pod/perlmod.pod Msg-ID: <199612152358.SAA28665@aatma.engin.umich.edu> (applied based on p5p patch as commit 9a079709134ebbf4c935cc8752fdb564e5c82b94) Subject: Put "splain" in utils. From: Chip Salzenberg <chip@atlantic.net> Files: Makefile.SH installperl utils/Makefile utils/splain.PL Subject: Some h2ph fixes Date: Fri, 13 Dec 1996 11:34:12 -0800 From: Jeff Okamoto <okamoto@hpcc123.corp.hp.com> Files: utils/h2ph.PL Here is a message regarding changes to h2ph that should probably be folded into the 5.004 release. p5p-msgid: <199612131934.AA289845652@hpcc123.corp.hp.com>
Diffstat (limited to 'pod/perldsc.pod')
-rw-r--r--pod/perldsc.pod42
1 files changed, 21 insertions, 21 deletions
diff --git a/pod/perldsc.pod b/pod/perldsc.pod
index 6991e7a085..5beaa8bbe9 100644
--- a/pod/perldsc.pod
+++ b/pod/perldsc.pod
@@ -30,7 +30,7 @@ with three dimensions!
Alas, however simple this may appear, underneath it's a much more
elaborate construct than meets the eye!
-How do you print it out? Why can't you just say C<print @LoL>? How do
+How do you print it out? Why can't you say just C<print @LoL>? How do
you sort it? How can you pass it to a function or get one of these back
from a function? Is is an object? Can you save it to disk to read
back later? How do you access whole rows or columns of that matrix? Do
@@ -41,11 +41,11 @@ of the blame for this can be attributed to the reference-based
implementation, it's really more due to a lack of existing documentation with
examples designed for the beginner.
-This document is meant to be a detailed but understandable treatment of
-the many different sorts of data structures you might want to develop. It should
-also serve as a cookbook of examples. That way, when you need to create one of these
-complex data structures, you can just pinch, pilfer, or purloin
-a drop-in example from here.
+This document is meant to be a detailed but understandable treatment of the
+many different sorts of data structures you might want to develop. It
+should also serve as a cookbook of examples. That way, when you need to
+create one of these complex data structures, you can just pinch, pilfer, or
+purloin a drop-in example from here.
Let's look at each of these possible constructs in detail. There are separate
documents on each of the following:
@@ -76,15 +76,15 @@ of these types of data structures.
The most important thing to understand about all data structures in Perl
-- including multidimensional arrays--is that even though they might
appear otherwise, Perl C<@ARRAY>s and C<%HASH>es are all internally
-one-dimensional. They can only hold scalar values (meaning a string,
+one-dimensional. They can hold only scalar values (meaning a string,
number, or a reference). They cannot directly contain other arrays or
hashes, but instead contain I<references> to other arrays or hashes.
-You can't use a reference to a array or hash in quite the same way that
-you would a real array or hash. For C or C++ programmers unused to distinguishing
-between arrays and pointers to the same, this can be confusing. If so,
-just think of it as the difference between a structure and a pointer to a
-structure.
+You can't use a reference to a array or hash in quite the same way that you
+would a real array or hash. For C or C++ programmers unused to
+distinguishing between arrays and pointers to the same, this can be
+confusing. If so, just think of it as the difference between a structure
+and a pointer to a structure.
You can (and should) read more about references in the perlref(1) man
page. Briefly, references are rather like pointers that know what they
@@ -102,7 +102,7 @@ multidimensional arrays work as well.
$hash{string}[7] # hash of arrays
$hash{string}{'another string'} # hash of hashes
-Now, because the top level only contains references, if you try to print
+Now, because the top level contains only references, if you try to print
out your array in with a simple print() function, you'll get something
that doesn't look very nice, like this:
@@ -149,7 +149,7 @@ again and again:
$LoL[$i] = \@list; # WRONG!
}
-So, just what's the big problem with that? It looks right, doesn't it?
+So, what's the big problem with that? It looks right, doesn't it?
After all, I just told you that you need an array of references, so by
golly, you've made me one!
@@ -218,7 +218,7 @@ something is "interesting", that rather than meaning "intriguing",
they're disturbingly more apt to mean that it's "annoying",
"difficult", or both? :-)
-So just remember to always use the array or hash constructors with C<[]>
+So just remember always to use the array or hash constructors with C<[]>
or C<{}>, and you'll be fine, although it's not always optimally
efficient.
@@ -290,14 +290,14 @@ this:
my $listref = [
[ "fred", "barney", "pebbles", "bambam", "dino", ],
[ "homer", "bart", "marge", "maggie", ],
- [ "george", "jane", "alroy", "judy", ],
+ [ "george", "jane", "elroy", "judy", ],
];
print $listref[2][2];
The compiler would immediately flag that as an error I<at compile time>,
because you were accidentally accessing C<@listref>, an undeclared
-variable, and it would thereby remind you to instead write:
+variable, and it would thereby remind you to write instead:
print $listref->[2][2]
@@ -325,7 +325,7 @@ example, given the assignment to $LoL above, here's the debugger output:
2 ARRAY(0x13b540)
0 'george'
1 'jane'
- 2 'alroy'
+ 2 'elroy'
3 'judy'
There's also a lower-case B<x> command which is nearly the same.
@@ -449,7 +449,7 @@ types of data structures.
# print the whole thing with indices
foreach $family ( keys %HoL ) {
print "family: ";
- foreach $i ( 0 .. $#{ $HoL{$family} ) {
+ foreach $i ( 0 .. $#{ $HoL{$family} } ) {
print " $i = $HoL{$family}[$i]";
}
print "\n";
@@ -746,7 +746,7 @@ many different sorts:
# reading from file
# this is most easily done by having the file itself be
# in the raw data format as shown above. perl is happy
- # to parse complex datastructures if declared as data, so
+ # to parse complex data structures if declared as data, so
# sometimes it's easiest to do that
# here's a piece by piece build up
@@ -817,7 +817,7 @@ You cannot easily tie a multilevel data structure (such as a hash of
hashes) to a dbm file. The first problem is that all but GDBM and
Berkeley DB have size limitations, but beyond that, you also have problems
with how references are to be represented on disk. One experimental
-module that does attempt to partially address this need is the MLDBM
+module that does partially attempt to address this need is the MLDBM
module. Check your nearest CPAN site as described in L<perlmod> for
source code to MLDBM.