getter-setter | 易学教程

override getter only needs @synthesize

阅读更多关于 override getter only needs @synthesize

I want to ovveride getter for lazy instantiation and leave default setter. Do I need @synthesize ? Why ? @interface Foo() @property (strong, nonatomic) NSObject *bar; @end @implementation Foo - (NSObject *)bar { if(!_bar) _bar = [[NSObject alloc] init]; return _bar; } @end Update: I've changed variable and class name, because it was confusing. From Deck and card to Foo and bar. No, you only need to explicitly synthesize (to get the synthesized ivar) if you explicitly implement all of the accessor methods (both getter and setter for readwrite properties, just the getter for readonly properties)

How to conform to a protocol's variables' set & get?

阅读更多关于 How to conform to a protocol's variables' set & get?

I'm playing around with protocols and how to conform to them. protocol Human { var height: Int {get set} } struct boy : Human { var height: Int {return 5} // error! } I'm trying to learn different ways that I can implement set and get. However the code above throws the following error: type 'boy' does not conform to protocol 'Human' However writing as below won't have any errors: struct boy : Human { var height = 5 // no error } I don't understand the difference nor what exactly needs to be implemented when you can also set a variable. I looked into different questions and tutorials but they

Get and set (private) property in PHP as in C# without using getter setter magic method overloading

阅读更多关于 Get and set (private) property in PHP as in C# without using getter setter magic method overloading

问题 Summary Code sample: Class People { // private property. private $name; // other methods not shown for simplicity. } Straight forward. Let me assume that $name is a PRIVATE class member (or property, variable, field, call it as you wish) . Is there any way to do these in PHP: $someone = new People(); $someone->name = $value; $somevar = $someone->name; WITHOUT using __get($name) and __set($name, $value) . Background I needed to check the assigned $value , therefore I simply need a getter

Override a object's bracket [index] getter/setter in JavaScript?

阅读更多关于 Override a object's bracket [index] getter/setter in JavaScript?

I am currently building a Doubly linked list implementation. What I am trying (or hoping) to do, is to use a setter / getter to set elements in the list, just like you would in an array: var index = 5; list[index] = node_x; However, I can't just use this syntax, because the nodes aren't technically properties of the list. Think of the list as 2 hooks. These 2 hooks are connected to 2 ends of a chain, but you can only access the those 2 connecting chain-links (And their siblings through them). The rest of the chain-links are not properties of the list. That's why I need to override the

How to “override” a defined (get-)property on a prototype?

阅读更多关于 How to “override” a defined (get-)property on a prototype?

问题 I have some code which defines a getter (but no setter, if such is relevant) on a prototype. The value returned is correct in 99.99% of the cases; however, the goal is to set the property to evaluate to a different value for a specific object. foo = {} Object.defineProperty(foo, "bar", { // only returns odd die sides get: function () { return (Math.random() * 6) | 1; } }); x = Object.create(foo); x.bar // => eg. 5 x.bar = 4 // by fair dice roll x.bar // nope => eg. 3 How can the property be

C# getter and setter shorthand

阅读更多关于 C# getter and setter shorthand

问题 If my understanding of the internal workings of this line is correct: public int MyInt { get; set; } Then it behind the scenes does this: private int _MyInt { get; set; } Public int MyInt { get{return _MyInt;} set{_MyInt = value;} } What I really need is: private bool IsDirty { get; set; } private int _MyInt { get; set; } Public int MyInt { get{return _MyInt;} set{_MyInt = value; IsDirty = true;} } But I would like to write it something like: private bool IsDirty { get; set; } public int

setter and getter for an atomic property

阅读更多关于 setter and getter for an atomic property

问题 what's the auto-gen'd getter and setter look like for the following property value? ... in .h @interface MyClass : NSObject { @private NSString *_value; } @property(retain) NSString *value; ... in .m @synthesize value = _value; what if I change the property to be @property(retain, readonly) NSString *value; specifically I am interested in the atomic part of the story, plus the retain, and if possible, detailed code would be more clear as to what's going exactly going on behind the scene. 回答1:

Overriding Doctrine_Record (sfDoctrineRecord) instance methods in Doctrine PHP Symfony

阅读更多关于 Overriding Doctrine_Record (sfDoctrineRecord) instance methods in Doctrine PHP Symfony

问题 My background is in Propel, so I was hoping it would be a simple thing to override a magical getter in a Doctrine_Record (sfDoctrineRecord), but I'm getting either a Segfault or the override method is simply ignored in favor of the one in the superclass. https://gist.github.com/697008eaf4d7b606286a class FaqCategory extends BaseFaqCategory { public function __toString() { return $this->getCategory(); } // doesn't work // override getDisplayName to fall back to category name if getDisplayName

Independent getter/setter methods, or combined?

阅读更多关于 Independent getter/setter methods, or combined?

问题 While working on a project, I've been making some changes and browsing around existing framework API docs for insight. While perusing the Kohana docs, I noticed that the getters/setters of any given class are typically combined: public function someProperty($value = null){ if(is_null($value){ return $this->_someProperty; } $this->_someProperty = $value; return $this; } Rather than: public function setSomeProperty($value){ $this->_someProperty = $value; return $this; } public function

Easy way to generate Getters and Setters in Visual Studio

阅读更多关于 Easy way to generate Getters and Setters in Visual Studio

Is there a way to generate getters and setters in Visual Studio? I'm trying with Alt + R , F and i get this: public String Denomination { get { return denomination; } set { denomination = value; } } and what I want is this: public String getDenomination() { return Denomination; } public void setDenomination(String Denomination) { this.Denomination = Denomination; } is there a way to do that? You can use the prop code snippet to create automatic properties. Type prop , and press Tab . You can then change the Type and name of the property. In your simple case, where no additional logic is