getter

问题 Is there an ivar property we should use in a Swift getter? My code is causing the getter to call the getter until the program crashes: var document: UIDocument? { get { return self.document } set { self.document = newValue useDocument() } } 回答1: Swift properties do not have the concept of separate, underlying storage like they do in Objective-C. Instead, you'll need to create a second (private) property and use that as the storage: private var _document: UIDocument? var document: UIDocument?

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 8 years ago . So I know there are a lot of questions on getters and setters in general, but I couldn't find something exactly like my question. I was wondering if people change the use of get/set depending on different languages. I started learning with C++ and was taught to use getters and setters. This is what I understand:

问题 If you have a class with some plain get/set properties, is there any reason to use the getters within the class methods, or should you just use the private member variables? I think there could be more of an argument over setters (validation logic?), but I'm wondering just about getters. For example (in Java) - is there any reason to use option 2?: public class Something { private int messageId; public int getMessageId() { return this.messageId; } public void setMessage(int messageId) { this

问题 How do I emulate PHP-style __get() and __set() magic getter/setters in JavaScript? A lot of people say that this is currently impossible. I am almost certain that it is possible because projects like nowjs (http://nowjs.com) do something like this. I know that you can utilize get and set, but these don't work when you're not sure what the property name will be. For example, what if you wanted an event handler to execute when a new property is created ? Example of what I'd want to do: var obj

问题 In some of the classes accessors are declared like getName1 and in others like getName2 . From the usage perspective, it looks identical. Are there any performance benefit of one over the other in a decent compiler? Are there any cases where I should use only one of the two? class MyClass { public: MyClass(const string& name_):_name(name_) { } string getName1() const { return _name; } const string& getName2() const { return _name; } private: string _name; }; int main() { MyClass c("Bala");

问题 I have static DefaultSharedPreference variable defined as like here: public class Itu extends Application { public static SharedPreferences sharedPreferencesFDefault; @Override public void onCreate() { sharedPreferencesFDefault = PreferenceManager.getDefaultSharedPreferences(this); } public static SharedPreferences getSharedPreferencesItu(){ return sharedPreferencesFDefault; } } (1. way) When i access it directly from some Activity, it clears sharedPreference: ((Itu) getApplication())

问题 I've been using the keyword get and set of JavaScript but I don't think that I'm implementing it correctly. _maxWinnings: -1, get maxWinnings() { return this._maxWinnings; }, setMaxWinnings : function( value ) { this._maxWinnings = value; // This works fine. // this.maxWinnings = value; } I've done series of tests and the results are not as expected. console.log( this.sgd._maxWinnings ); > -1 console.log( this.sgd.maxWinnings ); > -1 console.log( this.sgd.setMaxWinnings(10) ); > undefined

问题 If I have a class: class A { public: A(); ~A(); int something(); } class B { public: B() {a = new A();}; ~B(); private: A *a; } main() { B x; } Is the only way to use object "a" in main is to have a getter for it? class B { public: A getA() {return *a;}; private: A *a; } And then if I wanted to set the private variable object, I would need a setter, and set it in main? Edit: I updated class A, B, main a little. Main question is, what is the best way if I create an object of B in main. Can I

问题 I've got a value object, which stores info for example amount. The getAmount() getter returns amount in cents. However in various places, we need to get amount in dollar. There are 2 approaches I can think of: write a convert method and place it in a utility class. add a getAmountInDollar() getter in the value object. I prefer the second approach. What do you think? What are pros and cons of both approaches? 回答1: That's a bit a matter of taste. But, in my opinion, if this information is

问题 i'm using jsf 2.0.2 + richfaces 3.3.3. what can i do so my getter won't be invoked multiple time ?? i have this: @ManagedBean(name = "mybean") @SessionScoped public class mybean implements Serializable { public MyClass getMyClass() { if (FacesContext.getCurrentInstance().getRenderResponse()) { myClass = get_it_from_database(); } return myClass; } i also used this: @ManagedBean(name = "mybean") @SessionScoped public class mybean implements Serializable { public MyClass getMyClass() { if