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: functionHandler.m
    path of file: ./repos/Performance-Estimation-Toolbox/PESTO_files
    
    the code of the file until where you have to start completion: classdef (Abstract) functionHandler < handle
    properties (Access=private)
        
        expr_list_others;
        list_size_others;
        names_list_others;
    end
    methods
        
    
function delete(obj)
            functionHandler.CountActive(-1);
        end
        function obj=AddConstraint(obj,expr,name)
            assert(isa(expr,'Constraint'),'Invalid constraint');
            if nargin < 3
                obj.list_size_others=obj.list_size_others+1;
                obj.expr_list_others{obj.list_size_others,1}=expr;
                obj.names_list_others{obj.list_size_others,1}='Unnamed constraint';
            elseif nargin == 3
                assert(ischar(name),'Invalid name in constraint (must be array of characters; use single quotes)');
                obj.list_size_others=obj.list_size_others+1;
                obj.expr_list_others{obj.list_size_others,1}=expr;
                obj.names_list_others{obj.list_size_others,1}=name;
            end