On Wed, Sep 10, 2014 at 4:18 AM, Rob Dixon <rob.di...@gmx.com> wrote:
> On 09/09/2014 02:20, Ken Peng wrote:
>>
>>
>>> The second option creates the same array and populates it, but then
>>> copies it to another anonymous array, deletes the first array, and
>>> returns a reference to the copy.
>>
>>
>> Since this is a shadow copy, I don't think the first array will be
>> deleted completely. Isn't it?
>
>
> The second option is this
>
> sub myfunc {
> my @x=(1,2,3);
> return [@x];
> }
>
> And yes, the array @x is created, populated, and deleted completely
> every time the subroutine is called.
>
Hm, I believe you're in error IIRC. What happens is perl's internal array
structure for @x is marked inaccessible when the sub exits.This enables
the struct to be more quickly resurrected on subsequent calls. Scope is
preserved without doing extra work on re-entry.
Note the IIRC. Corrections welcome.
--
Charles DeRykus
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