Put a DESTROY method in your Log class that writes out the line that you want when the log object is destroyed. Leave the IO::File class alone. 

use IO::File;

package Log;

sub new {
    my ($class, $file) = @_;
    my $self = bless {}, $class;
    $self{fh} = IO::File->new( $file, ">>" ) or die $!;
    return $self;
}

sub log {
    my $self = shift;
    $self{fh}->print( map { scalar localtime() . " $_\n" } @_ );
}

sub DESTROY {
    my $self = shift;
    $self{fh}->print scalar localtime(), "Finished\n";
    $self{fh}->close;
}

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-xdg

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In reply to Re: Redefine DESTROY in class instance by xdg
in thread Redefine DESTROY in class instance by tmaly

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