How to get the name of the calling class in a static method?

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Daniel
Daniel 2014-10-6
回答： Captain Karnage 2023-5-16
Hi,
is there a way so that a static method can get the name of the class that is calling it?
In a non-static method, one always has the option of running class(obj) obj being the object on whihc the method is being applied. But how to do it for a static method?

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Guillaume
Guillaume 2014-10-6
mfilename('class')
However, since inheritance doesn't really have any effect on static methods, you could just hardcode it in the method.
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Guillaume
Guillaume 2014-10-7
Well, the simplest thing to do what you want is to take the showinfo method out of the class definition and implement it as a free function, on its own:
function showinfo(classname)
if ismember('baseclassname', superclasses(classname))
info = eval(sprintf('%s.extractinfo')); %dispatch to static method
%common code for showinfo
else
error('showinfo only applies to classes derived from baseclassname');
end
end
The calling syntax does not differ much anyway:
%using hypotetical derived static method that would know where it's called from:
derivedclassname.showinfo;
%using free function:
showinfo('derivedclassname');
Daniel
Daniel 2014-10-7
Yes, it works, so I'll have to do it like this.
The calling syntax was actually important, as the idea is that the users of my package know the available class names and can find out through autocompletion the available methods accessible to the users. That's the standard setting in my system, but well. Sometimes one cannot avoid exceptions.

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Captain Karnage
Captain Karnage 2023-5-16
Another option is you can pass an empty version of the subclass enumeration to the superclass method. This would mean you have to create a version of the function in each subclass, which I know is a bit of a pain, but it ends up being a very simple, one line function in the subclass. Below is a very simple example, but this works really well if the static function you want to use in the superclass it is in rather complicated as you can use a simple pass through to call it from the subclass.
classdef mySuperClass
methods(static)
function name = getName ( subObj )
arguments
subObj mySuperClass
end
name = class(subObj);
%Note: you can call any other static functions or properties using myEnum.staticname
end
end
end
classdef mySubClassA
methods(static)
function name = getName()
name = getName@mySuperClass( mySubClassA.empty );
end
end
end
classdef mySubClassB
methods(static)
function name = getName()
name = getName@mySuperClass( mySubClassB.empty );
end
end
end
now mySubClassA.getName will return "mySubClassA" and likewise for mySubClassB
If you do similar with other static functions - by passing an empty class in to subObj, you can call the getName function using subObj.getName.

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