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        pdf => $args{pdf},
        cache => [],
    };

    if ($self->{xmin} >= $self->{xmax}) {
        croak("'xmin' must be smaller than 'xmax'");
    }

    $self->{xdiff} = $self->{xmax} - $self->{xmin};

    bless $self => $class;

    return $self;
}

=head2 rand

Returns the next random number of PDF C<f(x)> as specified by the C<pdf>
parameter to C<new()>.

=cut