Access to class properties from class methods

Question

Metin Akyol 2022-2-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1641730-access-to-class-properties-from-class-methods

编辑： Metin Akyol 2022-2-3

I would like to access my classes properties from with the classes methods (both read and write access) but I am getting an 'unrecognized variable' error when doing this:

classdef class1

properties (Access = public)

var1, var2, var3

end

methods

function [returns, asset_names] = compute_holdings()

var1_test = var1 %% this seems to be incorrect

end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Benjamin Thompson 2022-2-2

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1641730-access-to-class-properties-from-class-methods#answer_887585

Use the argument obj for class methods that need to act on properties or methods of an instance of the class.

function [returns, asset_names] = compute_holdings(obj)

var1_test = obj.var1;

end

3 个评论
显示 1更早的评论隐藏 1更早的评论

Steven Lord 2022-2-3

在 MATLAB Online 中打开

If 'this' is implicitly passed into the method then this approach is not equivalent. For a non-Static method at least one of the inputs to the method must be an instance of the object, but you must accept that input explicitly. Note that Benjamin added an input argument to your method signature. If your method accepts multiple inputs, you should also be careful not to assume that the first input is always the object. If X is an instance of the mystuff class with a method doStuff, either of these calls the doStuff method in the mystuff class:

y = doStuff(X, 1)
z = doStuff(1, X) % Calling mystuff methods on the first input may error

Metin Akyol 2022-2-3

编辑：Metin Akyol 2022-2-3

Very helpful, thank you for clarifying 'this' (no pun intended) Steven. That is very good to know!!! (alright, I'll admit it, the pun was intended ;-)).

请先登录，再进行评论。