如何在Matlab中將類實例作爲句柄傳遞

假設我們有2個實體：老闆和員工。當員工完成工作時，他/她想讓人們知道。在這種情況下，老闆'種'訂閱該消息並決定要做什麼

我實現了這個接口，它具有任何其他類可以實現的抽象方法。在這個（因爲他/她將決定他/她想要做什麼）：

classdef (Abstract) Interface < handle 

    methods 
     getJobsCompleted(n) 
    end 

end

老闆類繼承接口和實現方法getJobsCompleted（）

classdef Boss < Interface & handle 

    properties 
     myEmployee 
    end 

    methods 
     function this = Boss() 
      this.myEmployee = Employee(this) 

      this.myEmployee.doJobs(); 
     end 
     %My boss implements (i.e. decides what to do) the abstract method 
     function getJobsCompleted(n) 

      %DO SOMETHING with n 
     end 
    end 

end

最後，員工執行工作並通知老闆。

classdef Employee < handle 

    properties 
     numJobsCompleted; 
     boss = [];%pointer or reference to Boss instance 
    end 

    methods 
     function this = Employee(myBoss) 
      this.boss = myBoss; %reference/pointer to my boss so I know who to notify 
     end 

     function doJobs() 
      %% do something then let boss know 
      this.numJobsCompleted = 40; 
      this.boss.getJobsCompleted(this.numJobsCompleted); 
     end 

    end 

end

我一直試圖失敗的做法是將一個引用傳遞給Employee類，以便他/她知道要通知哪位老闆。

即

in Boss 
this.myEmployee = Employee(this)

來源

2016-09-16 anr

這將工作，你只需要明確接受對象實例作爲輸入參數的所有方法。您需要更新以下兩個函數的定義：

function doJobs(this) 
function getJobsCompleted(this, n)

話雖這麼說，這樣做的更好的辦法可能是使用events and listeners。然後，您會讓員工發出「JobCompleted」事件，讓老闆爲所有員工傾聽這些事件。這可以防止員工需要跟蹤他們的老闆。

classdef Boss < handle 

    properties 
     Employees 
     Listeners 
    end 

    methods 
     function this = Boss(employees) 
      this.Employees = employees; 

      this.Listeners = addlistener(employees, 'JobCompleted', @this.onJobCompleted); 
     end 

     function onJobCompleted(this, employee, evnt) 
      fprintf('%s completed a job!\n', employee.Name); 
     end 
    end 
end

Employee.m

classdef Employee < handle 

    properties 
     Name 
     CompletedJobs = 0 
    end 

    events 
     JobCompleted 
    end 

    methods 
     function this = Employee(name) 
      this.Name = name; 
     end 

     function doJob(this) 
      this.CompletedJobs = this.CompletedJobs + 1; 
      notify(this, 'JobCompleted') 
     end 
    end 
end

而且使用它像：

employees(1) = Employee('Fred'); 
employees(2) = Employee('Bill'); 

boss = Boss(employees); 

doJob(employees); 
doJob(employees(1));

來源

2016-09-16 14:45:16 Suever

如何在Matlab中將類實例作爲句柄傳遞

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