[perl #78288] ref and other ops are inefficient in boolean context

On Thu, 27 Jul 2017 16:14:18 -0700, sprout wrote:
> On Thu, 27 Jul 2017 03:50:56 -0700, davem wrote:
> > A downside of &PL_sv_zero is that if assigned to a variable, that
> > variable
> > gets int, num and string values rather than just an int value.
> 
> Why does that need to be the case?  Why cannot PL_sv_zero have just
> the SvIOK flag on?
> 
> Does it matter that \(%h && $foo) now returns a reference to a read-
> only value when %h is empty?  (If so, that can be solved by turning on
> PADTMP on PL_sv_zero.)

I think it does matter.  grep(1,@list_with_one_item) returning a mutable 1 and grep(1,@list_with_zero_items) returning a read-only variable is the kind of icky inconsistency that I tried hard to eliminate.

-- 

Father Chrysostomos


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via perlbug:  queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=78288

• [perl #78288] ref and other ops are inefficient in boolean context by James E Keenan via RT
• Re: [perl #78288] ref and other ops are inefficient in booleancontext by Dave Mitchell
• Re: [perl #78288] ref and other ops are inefficient in booleancontext by Dave Mitchell
• Re: [perl #78288] ref and other ops are inefficient in booleancontext by Dave Mitchell
• [perl #78288] ref and other ops are inefficient in boolean context by Father Chrysostomos via RT
• Re: [perl #78288] ref and other ops are inefficient in booleancontext by Dave Mitchell
• Re: [perl #78288] ref and other ops are inefficient in booleancontext by Dave Mitchell
• [perl #78288] ref and other ops are inefficient in boolean context by Father Chrysostomos via RT
• Re: [perl #78288] ref and other ops are inefficient in booleancontext by Dave Mitchell
• [perl #78288] ref and other ops are inefficient in boolean context by Father Chrysostomos via RT
• Re: [perl #78288] ref and other ops are inefficient in booleancontext by Dave Mitchell