Class 'dependent' property warning
조회 수: 2(최근 30일)
I'm trying to build a class, one of the properties of which is also a class. I want to be able to index the properties of the contained class from the top class. This toy example shows what I mean I hope... I make the inner class and override it's disp method so it displays as I see it....
<...okay this thing won't let me paste code into this so I can't actually ask my question. This editor is really not working very well for me at least...>
Steven Lord 2019년 3월 8일
I believe one of the reasons (maybe the main reason) for that Code Analyzer warning is to avoid accidentally getting into a recursive situation. Consider:
x = 0;
y = 0;
function obj = set.x(obj, newx)
obj.x = newx;
obj.y = obj.y + 1;
function obj = set.y(obj, newy)
obj.y = newy;
obj.x = obj.x + 1;
Construct an instance of this object then try to update one of its properties.
q = classWithRecursionProblem
q.x = 1
You should receive an error indicating that there's a problem with recursion. The set method for the x property causes the set method for the y property to be called and the set method for the y property causes the set method for the x property to be called. It's like a pair of dictionary definitions: "Loop, infinite: see Infinite loop" and "Infinite loop: see Loop, infinite".
Note also that this is a Code Analyzer warning not a Code Analyzer error. As long as you avoid trying to assign to another property inside a different property's set method you're probably okay. Actually, reading the Details for that Code Analyzer warning they describe another somewhat related scenario related to loading objects, linking to this documentation page that provides more information.