delegation

Delegation VS Concatenation in Javascript

这一生的挚爱 提交于 2021-02-08 11:43:25
问题 Javascript lacks a class construct, however you can still achieve inheritance many different ways. You can mimic classes by utilizing prototypes to create constructor functions and thus implementing inheritance via delegation. The most common way to do this is with the new keyword, but you can also implement object.create() . Alternatively, you can take a concatenative approach and copy behavior that you want your object to inherit directly into the object itself, rather than by pointing its

In OOP, what is forwarding and how is it different from delegation?

冷暖自知 提交于 2020-08-21 04:31:12
问题 Would someone please explain the difference between forwarding and delegation? They seem similar, but I haven't been able to find a good definition of forwarding, so I'm not sure I really understand. 回答1: Let's first define two terms: sender : the object that sends a message/task to another object(the receiver) receiver : the object that receives a message/task from the sender The difference between forwarding and delegation is that in forwarding the receiver acts in its own context whereas

C++ allow derived classes of friend to have access to private nested class

空扰寡人 提交于 2020-02-06 07:30:06
问题 Here's what I'm trying to do: class A { friend class C (and all of C's derived classes) public: void DoAThing() { mpMyC->DelegateResponsibility(myB); } private: class B { }; B mMyB; C* mpMyC; }; class C { // No problem here- C can see B virtual void DelegateResponsibility(const A::B& necessaryInfo); }; class D: public C { // Uh-oh- we don't inherit friendship virtual void DelegateResonsibility(const A::B& necessaryInfo); }; In short, I have a private nested class inside A because it's an

How do I configure IIS so that the user's domain credentials are used when connecting to SQL server?

亡梦爱人 提交于 2020-01-11 02:30:49
问题 We've recently released the latest version of our intranet application, which now uses windows authentication as standard, and needs to be able to connect to a configured SQL server with the end-user's domain credentials. Lately we've found that on a couple of customer deployments, although IIS can see the user's domain credentials, it will not pass these on to SQL server. Instead, it seems to use the anonymous account. This is in spite of following all the correct steps (changing the

iOS 消息的传递机制

烂漫一生 提交于 2020-01-07 13:14:57
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 转载原地址:http://beyondvincent.com/blog/2013/12/14/124-communication-patterns/ 注1:本文由破船译自 Communication Patterns 。 本文目录如下所示: 可用的机制 做出正确的选择 Framework示例 小结 每个应用程序或多或少,都由一些松耦合的对象构成,这些对象彼此之间要想很好的完成任务,就需要进行消息传递。本文将介绍所有可用的消息传递机制,并通过示例来介绍这些机制在苹果的Framework中如何使用,同时,还介绍了一些最佳实践建议,告诉你什么时机该选择使用什么机制。 虽然这一期的主题是关于Foundation Framework的,不过本文中还介绍了一些超出Foundation Framework(KVO和Notification)范围的一些消息传递机制,另外还介绍了delegation,block和target-action。 大多数情况下,消息传递该使用什么机制,是很明确的了,当然了,在某些情况下该使用什么机制并没有明确的答案,需要你亲自去尝试一下。 本文中,会经常提及接收者[recipient]和发送者[sender]。在消息传递机制中具体是什么意思,我们可以通过一个示例来解释:一个table view是发送者

How to use “issuer” tag in ALFA plugin?

匆匆过客 提交于 2020-01-07 01:19:45
问题 I am writing some administrative policies on ALFA plugin but I find out there's no such function of it. Does anyone know this aspect? 回答1: You would have to generate the issuer element separately using an ant script and some logic to generate the value of the issuer field e.g. by adding the dn of a certificate. It all depends on how your XACML engine implements delegation. ALFA itself doesn't do anything to the issuer field. Cheers, David. 来源: https://stackoverflow.com/questions/25128025/how

How to use “issuer” tag in ALFA plugin?

廉价感情. 提交于 2020-01-07 01:19:36
问题 I am writing some administrative policies on ALFA plugin but I find out there's no such function of it. Does anyone know this aspect? 回答1: You would have to generate the issuer element separately using an ant script and some logic to generate the value of the issuer field e.g. by adding the dn of a certificate. It all depends on how your XACML engine implements delegation. ALFA itself doesn't do anything to the issuer field. Cheers, David. 来源: https://stackoverflow.com/questions/25128025/how

Can not pass value of textfield to other viewcontroller in ios

蓝咒 提交于 2020-01-06 20:37:18
问题 I want to pass value of textfield in LoginView to uploadview but UserLogin1 always is NULL ( 0x000000) This is my codes: loginvuew.h @property (nonatomic,retain) IBOutlet UITextField *username; loginview.m -(IBAction)LoginButton:(id)sender{ uploadview= [[UploadTab alloc] initWithFrame:CGRectMake(0,0,0,0) andUsertring:username.text]; } uploadview.h @property (nonatomic, copy) NSString *UserLogin1; - (id)initWithFrame:(CGRect)frame andUsertring:(NSString *)strUser; uploadview.m - (id

Can not pass value of textfield to other viewcontroller in ios

北战南征 提交于 2020-01-06 20:37:03
问题 I want to pass value of textfield in LoginView to uploadview but UserLogin1 always is NULL ( 0x000000) This is my codes: loginvuew.h @property (nonatomic,retain) IBOutlet UITextField *username; loginview.m -(IBAction)LoginButton:(id)sender{ uploadview= [[UploadTab alloc] initWithFrame:CGRectMake(0,0,0,0) andUsertring:username.text]; } uploadview.h @property (nonatomic, copy) NSString *UserLogin1; - (id)initWithFrame:(CGRect)frame andUsertring:(NSString *)strUser; uploadview.m - (id

UINavigationControllers: How to pass value to higher (parent?) controller in stack?

。_饼干妹妹 提交于 2020-01-06 05:30:09
问题 I have SendingController which push to nav stack SendingDeatilsController (which one has a TableView). User should should pick in TableView one row (it checked by Checkmark) and I would like to pass the value of this row (let it will NSString object) to the SendingController. How can I realize this behaviour in my application? And is SendingController parent for SendingDetailController (attribute parentController of SDC refers to SC) ?? 回答1: If you want to implement this behaviour, pass the