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: AbstractCircularDistribution.m
    path of file: ./repos/libDirectional/lib/distributions/Hypertorus/Circle
    
    the code of the file until where you have to start completion: classdef (Abstract) AbstractCircularDistribution < AbstractHypertoroidalDistribution
    % AbstractCircu
    
function diracPos = approximateBT(left, right, n)
                %todo shift to mu=0?
                
                middle = (left+right)/2;
                % Base case: only one dirac remaining
                if n==1 
                    % Possibility 1: use middle for faster calculation
                    diracPos = middle;
                    % Possibility 2: use center of mass for higher accuracy
                    % diracPos = integral(@(x) x.*this.pdf(x), left, right)/this.cdf(right, left);% todo: bug if cdf is zero!
                    return
                end