How can I use NARGIN/NARGOUT to determine the number of input/output arguments of an object method?

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MathWorks Support Team
回答： Markus Leuthold 2015-4-16
I am trying to determine the number of input/output arguments of an object's method. When the name of any object method is passed to NARGIN/NARGOUT, the returned value is always -1 regardless of the number of inputs/outputs specified in the method signature.
The following syntax returns -1 for any MethodName:
nargout('MethodName')

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采纳的回答

MathWorks Support Team
The ability to call NARGIN/NARGOUT directly on object methods is not available in MATLAB. As a workaround, specify the class and method names explicitly using the following syntax:
nargout('ClassName>ClassName.MethodName')

更多回答（1 个）

Markus Leuthold
Markus Leuthold 2015-4-16
It's almost five years later and this bug still exists. Any news from Mathworks on how to handle this situation in 2015?
Example:
Class C
classdef C < handle
methods
function r=fcn1(~)
r='run fcn1';
end
function fcn2(~)
disp('run fcn2');
end
end
end
function run
function run(f)
switch nargout(f)
case 0
feval(f);
case 1
disp(feval(f));
case -1
disp('bug')
end
What I expect from the following code
>> c=C;
>> run(@c.fcn1)
run fcn1
>> run(@c.fcn2)
run fcn2
Instead I get
>> c=C;
>> run(@c.fcn1)
bug
>> run(@c.fcn2)
bug
How do you recommend to workaround in case where you want to know nargout from a function handle AND evaluate a function handle?

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