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: ExtFunLangmuirBinding.m
    path of file: ./repos/CADET/src/cadet-mi/bindings
    
    the code of the file until where you have to start completion: 
classdef ExtFunLangmuirBinding < KineticQuasiStationaryBindingModel
	%ExtFunLangmuirBinding Langmuir binding model with external fun
    
function val = get.EXTFUN(obj)
			val = obj.externalSource;
		end
		function set.EXTFUN(obj, val)
			obj.externalSource = val;
		end
	end

	methods (Static)

		function obj = loadobj(S)
			if isstruct(S)
				obj = ExtFunLangmuirBinding();
				obj.loadobjInternal(S);
			end