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List:       apache-modperl
Subject:    Re: [offtopic] perl newbie frustrated
From:       tomas () tuxteam ! de
Date:       2006-07-18 15:02:27
Message-ID: 20060718150227.GA8058 () www ! trapp ! net
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On Sat, Jul 15, 2006 at 02:12:34AM -0400, Jonathan Vanasco wrote:
> 
> On Jul 13, 2006, at 7:41 PM, Philip M. Gollucci wrote:
[...]
> I thought read once that within an array declaration, [] is a real  
> array and not a reference-- or did i dream that up and have been  
> dealing with anonymous arrays all along?

Well, both :-)

> 
> ie:
> 
> my @real= ( 1 , [11,12,13] , 2 ,[21,22,23]  );
> my $ref= [1,2,3];
> 
> i could have sworn i read that  when @real is compiled, the array-in- 
> an-array is real array and not a ref

The construct [1,2,3] allocates a real array somewhere in Perl's belly
and returns a ref to it, much like the construct
 
  char *str="abracadabra";

allocates a character array in C, but puts a pointer to it in the
variable *str.

So [1, 2, [3, 4, 5], 6]

just makes an array of 4 entries (of which the third, that's the one
with index 2, is a reference to a freshly allocated array of three
entries) and yields a raference to this whole thing.

So well, real arrays are involved somewhere, and you (or your code) get
a handle to those.

> i'm hopped up on too much codeine right now (bronchitis), so i'm  
> thinking less clearly than normal.  forgive what's probably a stupid  
> question.

But you got it right, somehow ;-)

I hope your bronchitis gets better
-- tomás

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