[ID 20000320.007] contradiction in context

This is a bug report for perl from ajolma@water.hut.fi,
generated with the help of perlbug 1.26 running under perl 5.00502.


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[Please enter your report here]

Using this admittedly strange piece of code

#!/usr/bin/perl -w

package Test;

use overload '>' => 'gt';

sub new {
    my $class = shift;
    my $value = shift;
    my $self = {};
    $self->{value} = $value;
    bless($self,$class);
    return $self;
}

sub gt {
    my $self = shift;
    my $cmp_to = shift;
    my $wantarray = wantarray();
    if (defined($wantarray)) {
	print "return value of wantarray() defined\n";
	return $self->{value} > $cmp_to;
    } else {
	print "return value of wantarray() NOT defined\n";
	$self->{value} = $self->{value} > $cmp_to;
    }
}

$test = new Test 5;

$test > 4;

print $test->{value},"\n";


I get the output:

Useless use of numeric gt in void context at ./test.pl line 31.
return value of wantarray() defined
5

but man perlfunc tells me: "wantarray ... Returns the undefined value
if the context is looking for no value (void context)."

To me this seems like a contradiction.

Regards,

Ari Jolma (member of Helsinki Perl Mongers)

[Please do not change anything below this line]
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Site configuration information for perl 5.00502:

Configured by root at Fri Nov 12 20:33:30 EET 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 2) configuration:
  Platform:
    osname=linux, osvers=2.2.12, archname=i686-linux
    uname='linux ariel.hut.fi 2.2.12 #2 fri nov 12 20:27:54 eet 1999 i686 unknown '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='cc', optimize='-O2', gccversion=2.7.2.3
    cppflags='-Dbool=char -DHAS_BOOL -I/usr/local/include'
    ccflags ='-Dbool=char -DHAS_BOOL -I/usr/local/include'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -lndbm -lgdbm -ldb -ldl -lm -lc -lposix -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

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@INC for perl 5.00502:
    /usr/lib/perl5/5.00502/i686-linux
    /usr/lib/perl5/5.00502
    /usr/lib/perl5/site_perl/5.005/i686-linux
    /usr/lib/perl5/site_perl/5.005
    .

---
Environment for perl 5.00502:
    HOME=/home/ajolma
    LANG (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/pgsql/bin:/home/ajolma/bin:/usr/local/java/bin:/usr/X11R6/bin:/usr/local/pgsql/bin:/home/ajolma/bin:/usr/local/java/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [ID 20000320.007] contradiction in context by Ari Jolma
• Re: [ID 20000320.007] contradiction in context by Nick Ing-Simmons