class

问题 In the vein of... @implementation MyClass - (id) objectForKeyedSubscript:(id)k { return [self something:k]; } Is it also possible to "subscript" Class objects? I too, am about to find out, with you.. but thought I would post this question as I tested it out, myself... + (id) objectForKeyedSubscript:(id)k { return [self.shared something:k]; } And alas.. it is not... id x = MyClass[@"document"]; error: unexpected interface name 'MyClass': expected expression But why, Daddy? Class ' sure get the

问题 I know this is a bit of a duplicate question but I want to ask it in a very specific way in order to clarify a very important point. The primary question being: Is there any difference at all between otherwise identical classes when one is a static nested class and the other is a regular, top-level, class other than access to private static fields in a containing class? // ContainingClass.java public class ContainingClass { private static String privateStaticField = ""; static class

问题 I've got a string which, in run-time, contains the name of a class that I want to instantiate. How would I do that? I read suggestions to use flash.utils.getDefinitionByName() : var myClass:Class = getDefinitionByName("package.className") as Class; var myInstance:* = new myClass(); However, that gives me the following error: [Fault] exception, information=ReferenceError: Error #1065: Variable className is not defined. 回答1: The easiest method I've come up with is to simply write the classnames

问题 I have problem with press a special letter (Turkish etc.) via java robot class. I hava a method to press keys which works as alt+keycode. I cant convert some special letters to current keycode. So how can I solve it. Thanx For Example: KeyStroke ks = KeyStroke.getKeyStroke('ö', 0); System.out.println(ks.getKeyCode()); Output : 246 // So alt+0246='ö' //but if I convert 'ş' to keycode //Output is 351 . So alt+351= '_' and alt+0351= '_' //What is the Correct combination for 'ş'. same for 'Ş', 'ş

问题 Consider these two cases : struct customType { dataType1 var1; dataType2 var2; dataType3 var3; } ; customType instance1; // Assume var1, var2 and var3 were initialized to some valid values. customType * instance2 = &instance1; dataType1 firstMemberInsideStruct = (dataType1)(*instance2); class CustomType { public: dataType1 member1; dataType2 member2; retrunType1 memberFunction1(); private: dataType3 member3; dataType4 member4; retrunType2 memberFunction2(); }; customType object; // Assume

问题 I'm learning about classes and inheritance in javascript. I thought that the following is a fairly standard way of extending an existing object as I got the style from the MDN docs on Object.create I was expecting to see 'ok' and then 'Yay! Hello' in the console, but instead I go this error: Uncaught TypeError: #<MyPromise> is not a promise at new MyPromise (<anonymous>:5:17) at <anonymous>:19:6 It looks like the Promise constructor is throwing an exception because it can tell that the object

问题 Any idea if there is a way to make the following code to work class Test(object): def __init__(self, var): self.var = var def changeme(self): self = Test(3) t = Test(1) assert t.var == 1 t.changeme() assert t.var == 3 is something like the following safe to use for more complex objects (like django models, to hot swap the db entry the instance is referring to) class Test(object): def __init__(self, var): self.var = var def changeme(self): new_instance = Test(3) self.__dict__ = new_instance._

问题 Class point is defined as (there are also some methods, atributes, and stuff in it, but this is minimal part): class point(): def ___init___(self, x, y): self.x = x self.y = y So, I saw this question, but when I tried applying it, it returns an error: G = nx.Graph() p = point(0,0) G.add_node(0, p) NetworkXError: The attr_dict argument must be a dictionary. If i use G = nx.Graph() p = point(0,0) G.add_node(0, data = p) I don't get an error, but when i try to access the x-coordinate, it turns

问题 I'm confronted with the following problem at the moment: I have a certain class in which the equals() - Method is overridden. However I'm not sure if it is ever being used (either in my or in one of my collegues projects). Is there a way to find out? When I search for references, well, it just gives me ALL references to the Object equals() - Method (which are quite a few). There surely must be an easier way than scan through all of them... Anyone got an idea? 回答1: You're asking Eclipse to

问题 An object of a struct/class (that has no constructor ) can be created using an initializer list . Why is this not allowed on struct/class with constructor ? struct r { int a; }; struct s { int a; s() : a(0) {} }; r = { 1 }; // works s = { 1 }; // does not work 回答1: No, an object with a constructor is no longer considered a POD (plain old data). Objects must only contain other POD types as non-static members (including basic types). A POD can have static functions and static complex data