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Overloading boolean conversion #161

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p5pRT opened this issue Jul 5, 1999 · 1 comment
Closed

Overloading boolean conversion #161

p5pRT opened this issue Jul 5, 1999 · 1 comment

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@p5pRT
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p5pRT commented Jul 5, 1999

Migrated from rt.perl.org#966 (status was 'resolved')

Searchable as RT966$

@p5pRT
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p5pRT commented Jul 5, 1999

From tgy@chocobo.org

I overload boolean conversion. '!' and 'unless' don't work.

#!/usr/bin/perl -wl

package Boolean;

use overload (
  bool => sub { ${+shift} },
  fallback => 1,
);

sub new {
  my ($class, $num) = @​_;
  $num ||= 0;
  bless \$num, $class;
}

package main;

for (1, 0) {
  print "NUM​: $_\n";

  my $i = new Boolean $_;

  print $i ? 1 : 0;
  print ! $i ? 1 : 0;

  if ($i) {
  print 1;
  } else {
  print 0;
  }

  unless ($i) {
  print 1;
  } else {
  print 0;
  }

  print '';
}

__END__
NUM​: 1

1
0
1
0

NUM​: 0

0
0
0
0

Perl Info


Site configuration information for perl 5.00502:

Summary of my perl5 (5.0 patchlevel 5 subversion 02) configuration:
  Platform:
    osname=MSWin32, osvers=4.0, archname=MSWin32-x86-object
    uname=''
    hint=recommended, useposix=true, d_sigaction=undef
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='cl.exe', optimize='-O2 -MD -DNDEBUG -TP -GX', gccversion=
    cppflags='-DWIN32'
    ccflags ='-O2 -MD -DNDEBUG -TP -GX -DWIN32 -D_CONSOLE -DNO_STRICT
-DHAVE_DES_FCRYPT -DPERL_OBJECT'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=10
    alignbytes=8, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='link', ldflags ='-nologo -nodefaultlib -release -machine:x86'
    libpth="C:\Perl\lib\core" 
    libs= oldnames.lib kernel32.lib user32.lib gdi32.lib  winspool.lib
comdlg32.lib advapi32.lib shell32.lib ole32.lib  oleaut32.lib netapi32.lib
uuid.lib wsock32.lib mpr.lib winmm.lib  version.lib odbc32.lib
odbccp32.lib PerlCRT.lib
    libc=C:\Perl\lib\core\PerlCRT.lib, so=dll, useshrplib=yes,
libperl=perlcore.lib
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -release
-machine:x86'

Locally applied patches:
    


@INC for perl 5.00502:
    c:\tim\moogle\lib
    C:\PERL\lib
    C:\PERL\site\lib
    .


Environment for perl 5.00502:
    HOME (unset)
    LANG (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)

PATH=C:\WINDOWS;C:\WINDOWS\COMMAND;C:\;C:\PROGRA~1\MISCUTIL;C:\PERL\BIN;C:\JAVA\BIN;C:\MSSQL\BINN;C:\PROGRA~1\NETWOR~1\MCAFEE~1
    PERL5LIB=c:\tim\moogle\lib
    PERL5OPT=-MWild
    PERL_BADLANG (unset)
    SHELL (unset)



-- 
Neko | tgy@chocobo.org | I want a moogle stuffy!


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