See AUTOLOAD section of Modern Perl: the free book, and mind the caveats

Assuming hashref has-a 'SVN::Client'

sub AUTOLOAD
{
    my ($name) = our $AUTOLOAD =~ /::(\w+)$/;
    my $method = sub
    {
        my $self = shift;
        return $self->{'SVN::Client'}->$name( @_ );
    }
    no strict 'refs';
    *{ $AUTOLOAD } = $method;
    return $method->( @_ );
}
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