Hi all,

This is a question regarding general knowledge of the perl language.
If i undef an object and the object has a destroy function, when is this function called ?
If i have a code 

         use Spreadsheet::WriteExcel;
    use File::Copy;

    # Create a new Excel workbook
    my $workbook = Spreadsheet::WriteExcel->new('perl.xls');

    # Add a worksheet
   my  $worksheet = $workbook->add_worksheet();

  # Write a formatted and unformatted string, row and column notation.
    $col = $row = 0;
    $worksheet->write($row, $col, 'Hi Excel!', $format);
    undef $worksheet;
    undef $workbook;
    copy("perl.xls","perl2.xls") or die "Copy failed: $!";

[download]

The excel workbook object has a destructor which calls the close function.
Can i assume that the close function of the workbook is called before the copy call, or do i have to close the workbook explicitely?
In c++ the destructor is called right when the object goes out of scope.
In java the destructor is called when the garbage collector wants and i can not rely on it.
What happens in perl ?

Thanks,
David

In reply to when is destroy function called by david2008

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