Question

我正在使用八度音程中的对象，我想在子类集中调用超类集合方法。在GNU octave文档中，我还没有找到它的工作方式，所以我尝试使用matlab documentation语法但是我得到了下一个错误：''未定义在第20行第5列附近电话是。

¿我怎样才能正确访问超类方法？

这里是代码：

function s = set (o, varargin)

s = o;
if (length (varargin) < 2 || rem (length (varargin), 2) != 0)
  error ([mfilename "  ::::  Expecting property/value pairs."]);
endif

while (length (varargin) > 1)             #We get the first 2 pairs while exist.            
  prop = varargin{1};
  val  = varargin{2};

  varargin(1:2) = [];
  if (strcmp (prop, "color")) 
    if (ismember (val, ["black", "red", "green", "yellow", "blue", "violet", "cyan", "white"] ))   #We check if val is a correct color.
      s.color = val;
    else
      error ([mfilename "  ::::  Expecting the value for ""color"" to be a correct color."]);  
    endif
  else
    set@entity (s, prop,val);
  endif
endwhile

endfunction

我将添加更多详细信息：

一个简单的例子可能是接下来的两个类：

try1，构造函数和方法（在他的文件夹@ try1中）：

 function t = try1(x)
    t.n = x;
    t = class (t, "try1")
 endfunction

function o = op(t,x)
    o = t.n + x;
endfunction

try2继承自try1，构造函数和方法（在他的文件夹@ try2中）：

 function t2 = try2(x)
    t1 = @try1(x);
    t.n = x;
    t2 = class (t, "try2",t1);
 endfunction

function o = op(t,x)
    o = t.n - x;
endfunction

如何使用try2的实例访问try1的op方法？

谢谢：）

Answer 1

如果要访问父类的构造函数，只需像通常在子类之外调用它一样。像这样：

$ cat @try1/try1.m 
function t = try1 (x)
  t.n = x;
  t = class (t, "try1");
endfunction
$ cat @try1/op.m 
function o = op (t)
  disp ("op() from try1");
  o = t.n + 5;
endfunction
$ cat @try2/try2.m 
function t2 = try2 (x)
  t1 = @try1 (x);
  t.n = x;
  t2 = class (t, "try2", t1);
endfunction
$ cat @try2/op.m 
function o = op (t)
  o = op (t.t1);
endfunction
$ octave
octave:1> try2 (5)
ans = <class try2>
octave:2> op (ans)
op() from try1
ans =  10

请参阅Object Oriented Programming上的手册部分，特别是Inheritance and Aggregation

部分

如何在八度音程中访问超类方法？

1 个答案: