Matlab单例模式

classdef singletonclass < handle
    methods(access = private)
        function obj = singletonclass()
           disp('singletonclass construtor called!');
        end
    end
    methods(static)
        function obj = getins()
            persistent ins;
            if isempty(ins) || ~isvalid(ins)
                ins = singletonclass();
            end
            obj = ins;
        end
    end
end