How to pass a class name as argument to a function
조회 수: 33 (최근 30일)
I'd like to initialize an element of a class with another class instance, and I'd like to pass in the particular class as an object. For example:
classdef Aclass < handle
function this = Aclass(thingClassName)
this.thingObj = thingClassName(arg1,arg2,etc);
This code doesn't work, though ("Index exceeds matrix dimensions"). I assume the problem is you can't call the () operator on an existing object.
Instead, I do this, which does work, but isn't pretty:
classdef SomeClass < handle
function this = SomeClass(thingClassName)
this.thingObj = eval([class(thingClassName) '(arg1,arg2,etc)']);
There's no checking in the string argument list, and errors in this line are hard to debug.
I could instantiate the object outside the constructor, but that's problematic. I'd like to instantiate the object within the "SomeClass" constructor because it knows the right way to do it.
I'm guessing this is really simple and that I haven't stumbled on the right way yet. Any ideas?
Jeff Miller 2019년 1월 30일
I think the first classdef ("Aclass") works fine, as long as you pass to its constructor the handle of the class you want instantiated. So, for example,
myobj = Aclass(@theClassToInstantiate)