将 class 属性转换为符合可见性的结构

Question

我正在开发一个 simulink 模型，该模型配置了不同的模式，它根据所选采样率滤波器组延迟等内容更改模型参数。 .

我想在 ParameterStruct 上设置所有参数，然后为每个模式加载正确的参数结构。

这种类型可以很好地映射到具有从属属性的 class，因为有很多模型参数仅由几个输入生成。

但是，当我尝试从 class 生成 struct 时，可见性不受尊重：

classdef SquareArea
   properties
      Width
      Height
   end
   properties (Access =private)
      Hidden
   end
   properties (Dependent)
      Area
   end
   methods
      function a = get.Area(obj)
         a = obj.Width * obj.Height;
      end
   end
end

>> x=SquareArea

x = 

  SquareArea with properties:

     Width: []
    Height: []
      Area: []

>> struct(x)
Warning: Calling STRUCT on an object prevents the object 
from hiding its implementation details and should thus
be avoided. Use DISP or DISPLAY to see the visible public
details of an object. See 'help struct' for more information.

ans = 

     Width: []
    Height: []
    Hidden: []
      Area: []

这是不可接受的，因为之后我需要将结构导出到 C，以便能够从生成的代码中动态设置模式。

Answer 1

publicProperties = properties(x);
myStruct = struct();
for iField = 1:numel(publicProperties), myStruct.(publicProperties{iField}) = []; end

Answer 2

您可以覆盖 class 的默认值 struct：

classdef SquareArea
   properties
      Width = 0
      Height = 0
   end
   properties (Access=private)
      Hidden
   end
   properties (Dependent)
      Area
   end
   methods
      function a = get.Area(obj)
         a = obj.Width * obj.Height;
      end
      function s = struct(obj)
          s = struct('Width',obj.Width, 'Height',obj.Height, 'Area',obj.Area);
      end
   end
end

现在：

>> obj = SquareArea
obj = 
  SquareArea with properties:

     Width: 0
    Height: 0
      Area: 0
>> struct(obj)
ans = 
     Width: 0
    Height: 0
      Area: 0

请注意，您仍然可以通过显式调用内置行为来获得原始行为：

>> builtin('struct', obj)
Warning: Calling STRUCT on an object prevents the object from hiding its implementation details and should
thus be avoided. Use DISP or DISPLAY to see the visible public details of an object. See 'help struct' for
more information. 
ans = 
     Width: 0
    Height: 0
    Hidden: []
      Area: 0

Answer 3

结合 Amro 和 DVarga 的答案，可以概括一个默认的结构函数：

     function s = struct(self)
        publicProperties = properties(self);
        s = struct();
        for fi = 1:numel(publicProperties)
            s.(publicProperties{fi}) = self.(publicProperties{fi}); 
        end                  
    end

将 class 属性转换为符合可见性的结构

Converting class properties to struct respecting visibility

matlab

oop

struct

class-visibility