Changing variable (properties in class) by method

Question

Pawel Gagatek 2018-11-20

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431064-changing-variable-properties-in-class-by-method

回答： Steven Lord 2018-11-20

classdef ClassName
   properties
      PropertyName
   end
   methods
      function [obj ] = ClassName()
         obj.PropertyName = 0;
      end
      function  [ ] = MethodName(obj,arg1,...)
          obj.PropertyName=obj.PropertyName+5;
      end
      function  [ ] = MethodName2(obj,arg1,...)
       obj.PropertyName=obj.PropertyName/2;
      end
   end
end

The question is how i can modify code to modify variable in properties by method.

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Answer 1

Steven Lord 2018-11-20

8
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431064-changing-variable-properties-in-class-by-method#answer_348085

Your class is a value class as opposed to a handle class. See this documentation page for a description of the differences between the two. The "Modifying Value Objects in Functions" and "Modifying Handle Objects in Functions" sections on that documentation page describe what happens when you modify properties of an instance of each kind of class in a function or method. So you can either:

Define the methods in your value class to return the modified object, and call the methods with the object as both input and output.
Change your class to a handle class.