You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: CircularUniformDistribution.m
    path of file: ./repos/libDirectional/lib/distributions/Hypertorus/Circle
    
    the code of the file until where you have to start completion: classdef CircularUniformDistribution < AbstractCircularDistribution & HypertoroidalUniformDistribution
    % Circular uniform distribu
    
function val = cdf(xa,startingPoint)
            % Evaluate cumulative distribution function 
            %
            % Parameters:
            %   xa (1 x n)
            %       points where the cdf should be evaluated
            %   startingPoint (scalar)
            %       point where the cdf is zero (starting point can be
            %       [0,2pi) on the circle, default 0
            % Returns:
            %   val (1 x n)
            %       cdf evaluated at columns of xa
            if nargin <=2
                startingPoint = 0;
            end