避免警告“非依赖属性的设置方法不应访问...". [英] Avoid warning "a set method for non-dependent property should not access ..."

问题描述

在一个名为param1, param2的示例中，我有一个具有某些属性的类，并且有2个相关.它们是独立的，只是受约束的. param2必须等于或大于param1，并且必须始终存在(如果param1确实存在).有问题的代码类似于:

I have a class which has some properties and 2 are related, in the example called param1, param2. They are independent, just constrained. param2 must be as large or larger than param1 and must always exist if param1 does. Code in question is something like:

    function set.param1(obj, input)
        disp('setting param1')
        obj.param1 = input;
        if (isempty(obj.param2) || obj.param2 < obj.param1) % Warning on param2
           obj.param2 = obj.param1; % Warning on param2
        end
    end

set.param2的类似代码. 代码工作正常，我看不到任何更好的方法.问题-产生警告设置方法..."，如标题中所述.由于缺乏更好的解决方案，我压制了它们. 有没有更好的方法来实现此功能并且没有警告?显然，它不是像隐藏功能SetParam2那样的骇人解决方案":

Similar code for the set.param2. Code works fine and I cannot see any better way to do it. The problem - it produces warning "a set method..." like mentioned in title. I suppressed them for the lack of better solution. Is there a better way to achieve this functionality and without warnings? Obviously not a hacky "solution" like a hidden function SetParam2:

function SetParam2(obj, input)
   obj.param2 = input;
end

这足以使编辑感到困惑，而不会抱怨.

which confuses editor just enough it doesn't complain.

推荐答案

您可以使用两层属性

• 一层暴露在外的Dependent
• 一层是私有的并且实际存储值

此处在文档中使用了类似的技术:

The similar technique is used here in the documentation: Avoid Property Initialization Order Dependency.

classdef TestClass < handle  
    properties (Access = private)
        privateParam1;
        privateParam2;
    end

    properties (Dependent)
         param1;
         param2;
    end

    methods
        function p1 = get.param1(obj)
            p1 = obj.privateParam1;
        end

        function p2 = get.param2(obj)
            p2 = obj.privateParam2;
        end

        function set.param1(obj, input)
            obj.privateParam1 = input;
            if (isempty(obj.privateParam2) || obj.privateParam2 < obj.privateParam1)
                obj.privateParam2 = obj.param1; 
            end
        end

         function set.param2(obj, input)
            if (~isempty(obj.privateParam1) && obj.privateParam1 > input)
                obj.privateParam2 = obj.privateParam1;
            else
                obj.privateParam2 = input;
            end
         end
    end
end

此处的窍门:privateParam1和privateParam2存储两个值.仅针对公开属性param1和param2实现的get和set:get仅返回内部属性，并且在set中都可以使用它们而无需分析器警告，因为它们被标记为.

The trick here: privateParam1 and privateParam2 stores the two values. The get and set only implemented for the exposed properties param1 and param2: the get returns simply the inner property and in the set both of them can be used without the analyzer warning as they are marked as Dependent.

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