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Thread: hash values - arrays do not replace literal values




hash values - arrays do not replace literal values
user name
 2007-10-20 17:12:02 
# New Ticket Created by  golbeckcs.umd.edu 
# Please include the string:  [perl #46585]
# in the subject line of all future correspondence about
this issue. 
# <URL: h
ttp://rt.perl.org/rt3/Ticket/Display.html?id=46585 >



This is a bug report for perl from golbeckcs.umd.edu,
generated with the help of perlbug 1.35 running under perl
v5.8.5.


------------------------------------------------------------
-----
[Please enter your report here]

when you have a value for a hash, and then try to treat it
as an array, it remembers 
the value. If we set it equal to something after pushing,
the array is lost. I think
the first behavior must be a bug.


#!/usr/bin/perl

#jen's perl bug. 
#golbeckcs.umd.edu


%h = ();
$h = 3;
push ({$h}, 2);
push ({$h}, 4);

print $h;
print "n";
print {$h};
print "n";

$h = 5;

print $h;
print "n";
print {$h};

[Please do not change anything below this line]
------------------------------------------------------------
-----
---
Flags:
    category=core
    severity=low
---
This perlbug was built using Perl v5.8.5 in the Red Hat
build system.
It is being executed now by Perl v5.8.5 - Mon Jul 24
18:27:33 EDT 2006.

Site configuration information for perl v5.8.5:

Configured by Red Hat, Inc. at Mon Jul 24 18:27:33 EDT
2006.

Summary of my perl5 (revision 5 version 8 subversion 5)
configuration:
  Platform:
    osname=linux, osvers=2.6.9-22.18.bz155725.elsmp,
archname=i386-linux-thread-multi
    uname='linux hs20-bc1-4.build.redhat.com
2.6.9-22.18.bz155725.elsmp #1 smp thu nov 17 15:34:08 est
2005 i686 i686 i386 gnulinux '
    config_args='-des -Doptimize=-O2 -g -pipe -m32
-march=i386 -mtune=pentium4 -Dversion=5.8.5
-Dmyhostname=localhost -Dperladmin=rootlocalhost
-Dcc=gcc -Dcf_by=Red Hat, Inc. -Dinstallprefix=/usr
-Dprefix=/usr -Darchname=i386-linux -Dvendorprefix=/usr
-Dsiteprefix=/usr -Duseshrplib -Dusethreads -Duseithreads
-Duselargefiles -Dd_dosuid -Dd_semctl_semun -Di_db -Ui_ndbm
-Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm -Duseperlio
-Dinstallusrbinperl -Ubincompat5005 -Uversiononly
-Dpager=/usr/bin/less -isr -Dinc_version_list=5.8.4 5.8.3
5.8.2 5.8.1 5.8.0'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef
useithreads=define usemultiplicity=define
    useperlio=define d_sfio=undef uselargefiles=define
usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE
-DDEBUGGING -fno-strict-aliasing -pipe -I/usr/local/include
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-I/usr/include/gdbm',
    optimize='-O2 -g -pipe -m32 -march=i386
-mtune=pentium4',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING
-fno-strict-aliasing -pipe -I/usr/local/include
-I/usr/include/gdbm'
    ccversion='', gccversion='3.4.6 20060404 (Red Hat
3.4.6-2)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8,
byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define,
longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8,
Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lresolv -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil
-lpthread -lc
    perllibs=-lresolv -lnsl -ldl -lm -lcrypt -lutil
-lpthread -lc
    libc=/lib/libc-2.3.4.so, so=so, useshrplib=true,
libperl=libperl.so
    gnulibc_version='2.3.4'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef,
ccdlflags='-Wl,-E
-Wl,-rpath,/usr/lib/perl5/5.8.5/i386-linux-thread-multi/CORE
'
    cccdlflags='-fPIC', lddlflags='-shared
-L/usr/local/lib'

Locally applied patches:
    

---
INC
for perl v5.8.5:
    /usr/lib/perl5/5.8.5/i386-linux-thread-multi
    /usr/lib/perl5/5.8.5
    /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.3/i386-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.1/i386-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.5
    /usr/lib/perl5/site_perl/5.8.4
    /usr/lib/perl5/site_perl/5.8.3
    /usr/lib/perl5/site_perl/5.8.2
    /usr/lib/perl5/site_perl/5.8.1
    /usr/lib/perl5/site_perl/5.8.0
    /usr/lib/perl5/site_perl
   
/usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi
   
/usr/lib/perl5/vendor_perl/5.8.4/i386-linux-thread-multi
   
/usr/lib/perl5/vendor_perl/5.8.3/i386-linux-thread-multi
   
/usr/lib/perl5/vendor_perl/5.8.2/i386-linux-thread-multi
   
/usr/lib/perl5/vendor_perl/5.8.1/i386-linux-thread-multi
   
/usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-multi
    /usr/lib/perl5/vendor_perl/5.8.5
    /usr/lib/perl5/vendor_perl/5.8.4
    /usr/lib/perl5/vendor_perl/5.8.3
    /usr/lib/perl5/vendor_perl/5.8.2
    /usr/lib/perl5/vendor_perl/5.8.1
    /usr/lib/perl5/vendor_perl/5.8.0
    /usr/lib/perl5/vendor_perl
    .

---
Environment for perl v5.8.5:
    HOME=/home/golbeck
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
   
PATH=/usr/kerberos/bin:/usr/local/java/jdk/bin:/usr/local/ja
va/ant/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/home
/golbeck/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash
Re: hash values - arrays do not replace literal values
user name
 2007-10-21 04:03:03 
On 21/10/2007, via RT golbeck  cs. umd. edu
<perlbug-followupperl.org> wrote:
> when you have a value for a hash, and then try to treat
it as an array, it remembers
> the value. If we set it equal to something after
pushing, the array is lost. I think
> the first behavior must be a bug.
>
>
> #!/usr/bin/perl
>
> #jen's perl bug.
> #golbeckcs.umd.edu
>
>
> %h = ();
> $h = 3;
> push ({$h}, 2);
> push ({$h}, 4);

You're pushing values to the array 3 here.
Using "use strict" would prevent you to use named
references like this.

> print $h;
> print "n";
> print {$h};
> print "n";
>
> $h = 5;
>
> print $h;
> print "n";
> print {$h};

And here you're using array 5, which is a different
array. Hence the
result you get is expected.

Note that hashes can't store arrays, only scalars. You
probably want to
store arrays references in your hash instead.
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