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arno's scratchpad

by arno (Scribe)
on Aug 23, 2004 at 14:46 UTC ( [id://385088]=scratchpad: print w/replies, xml ) Need Help??
Public ScratchpadDownload, Select Code To D/L
1) AUTOLOAD subroutine from Time::Hires.pm
2) What i typed
3) The error message i got

I'm new to Autoloading and i face with a problem which i'd like to solve on my own.
I read the documentation of various things including AutoLoader module, UNIVERSAL class, and others but i still don't understand where constant subroutine comes from.
What i understand is that AUTOLOAD is executed when location of a subroutine failed that's to say the symbol name isn't in the stash %::.
Here, i believe $constname contains this unfound symbol because of the affectation :
($constant = $AUTOLOAD) =~ s/.*:://;
I believe constant($constname) is responsible of this error message as perldiag doesn't describe a similar compilation failure.

1) -- from Time::HiRes.pm :
sub AUTOLOAD {
    my $constname;
    ($constname = $AUTOLOAD) =~ s/.*:://;
    die "&Time::HiRes::constant not defined" if $constname eq 'constan
+t';
    my ($error, $val) = constant($constname);
    if ($error) { die $error; }
    {
        no strict 'refs';
        *$AUTOLOAD = sub { $val };
    }
    goto &$AUTOLOAD;
}

[download]
2) --- what i did :

# perl -MTime::HiRes -e 1
3) --- what i get : ( i deleted what @INC contains in the output )

Can't locate loadable object for module Time::HiRes in @INC (@INC contains: ... ) at -e line 0
Compilation failed in require. BEGIN failed--compilation aborted.
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