Operator ->()

[Subra]

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 ->( ) !!!

 

[Peter Makholm]

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->{foo} - 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

 

[xhoster]

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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[Gunnar Hjalmarsson]

Subra wrote:

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

DO NOT DO THAT !!!