You need to include the & when you take the reference (otherwise your calling h and then taking a reference to teh result): 

j (\@ar, \@vr, \&h);

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And for most ordinary uses you can drop the & when calling the function as above. To invoke the coderef I prefer to use ->: 

$k->($i,$j);

[download]
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In reply to Re: using callback function by BrowserUk
in thread using callback function by Anonymous Monk

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