{{alias}}()
    Returns an accumulator function which incrementally updates a count.

    If provided a value, the accumulator function returns an updated count. If
    not provided a value, the accumulator function returns the current count.

    Returns
    -------
    acc: Function
        Accumulator function.

    Examples
    --------
    > var accumulator = {{alias}}();
    > var v = accumulator()
    0
    > v = accumulator( 2.0 )
    1
    > v = accumulator( -5.0 )
    2
    > v = accumulator()
    2

    See Also
    --------