Re: Re: Re: Detecting constant arguments passed to subroutines

I just noticed the REFCNT the Devel::Peek::Dump(undef) printed
That can't be right, can it?

Comment on Re: Re: Re: Detecting constant arguments passed to subroutines

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Re: Re: Re: Re: Detecting constant arguments passed to subroutines by japhy (Canon) on May 17, 2001 at 01:44 UTC
Perhaps it's that high so that it never "dies"? And the reason it doesn't say `undef` is constant (from my function) is because `undef = $foo` is illegal, but `(undef) = $foo` isn't. Fix: `sub is_const { defined($_[0]) and !eval { ($_[0]) = $_[0]; 1 } }` [download] `japhy` -- Perl and Regex Hacker	[reply] [d/l]
Re: Re: Re: Re: Detecting constant arguments passed to subroutines by chipmunk (Parson) on May 17, 2001 at 01:43 UTC
undef is a very popular value! :)	[reply]