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Subject Author Date
Operator ->() Subra 03-27-2008
`--> Re: Operator ->() Gunnar Hjalmars...03-27-2008
Posted by Subra on March 27, 2008, 9:37 am
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 Can some one pls tell me wts the meaning of "$topIter->next()" ?
I know "->" is used for hash refs, but dont know when to use ->( ) !!!

Posted by Peter Makholm on March 27, 2008, 9:49 am
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> Can some one pls tell me wts the meaning of "$topIter->next()" ?

This calls the method next() on the object $topIter. Read the perlobj
documentation for more about this.

> I know "->" is used for hash refs, but dont know when to use ->( ) !!!

Beside being used for method calls, '->' is also with references in
general for dereferencing. That is

$aref->[0] - Using an array reference as an array
$href-> - Using an hash reference as an hash
$sref->(1,2,3) - Using a subroutine reference (ie. call the sub)

Read more about this in the perlref documentation under 'Using
references', rule number 3.

//Makholm

Posted by xhoster on March 27, 2008, 12:01 pm
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> Can some one pls tell me wts the meaning of "$topIter->next()" ?

It invokes method "next" on the object contained in $topIter.

> I know "->" is used for hash refs, but dont know when to use ->( ) !!!

Your example is not ->(), it is ->next(), or more generically, ->$method().
They are quite different. The first is used on code-refs, the second on
objects.

Xho

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Posted by Gunnar Hjalmarsson on March 27, 2008, 3:35 pm
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Subra wrote:

[ exactly the same question as was posted to the beginners list a few
minutes earlier ]

DO NOT DO THAT !!!

--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl

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