overriding

问题 In Python, I'm trying to extend the builtin 'int' type. In doing so I want to pass in some keywoard arguments to the constructor, so I do this: class C(int): def __init__(self, val, **kwargs): super(C, self).__init__(val) # Do something with kwargs here... However while calling C(3) works fine, C(3, a=4) gives: 'a' is an invalid keyword argument for this function` and C.__mro__ returns the expected: (<class '__main__.C'>, <type 'int'>, <type 'object'>) But it seems that Python is trying to

问题 I have a custom Javascript class (created using John Resig's Simple Javascript Inheritance). I want to be able to compare two instances of this class, using the == , < , > , >= , and <= symbols. How do I override the comparators of my custom class? 回答1: this cannot be done in the way that you are implying it should be done (though that would be sweet). The best way I have seen this done is to implement on the prototype a set of methods to act like comparatives: gte : function( obj ){ //

问题 I have a custom Javascript class (created using John Resig's Simple Javascript Inheritance). I want to be able to compare two instances of this class, using the == , < , > , >= , and <= symbols. How do I override the comparators of my custom class? 回答1: this cannot be done in the way that you are implying it should be done (though that would be sweet). The best way I have seen this done is to implement on the prototype a set of methods to act like comparatives: gte : function( obj ){ //

问题 I have a simple base class and derived class: class Base { public virtual void Write(int value) { Console.WriteLine("base int: {0}", value); } public virtual void Write(string value) { Console.WriteLine("base string: {0}", value); } } class Derived : Base { public override void Write(int value) { Console.WriteLine("derived int: {0}", value); } public virtual void Write(IEnumerable enumerable) { Console.WriteLine("derived IEnumerable: {0}", enumerable); } public virtual void Write(object o) {

问题 I'm new to iOS development and a bit stucked with such problem. In my iphone app I'm using this awesome dropdown view controller https://github.com/nmattisson/DropdownMenu via Cocoapods . I'm extending DropdownMenuController in my own MyDropdownMenuController : MyDropdownMenuController.h #import "DropdownMenuController.h" @interface MyDropdownMenuController : DropdownMenuController @end I would like to override this drawOpenLayer (https://github.com/nmattisson/DropdownMenu/blob/master

问题 I think I am a bit mixed up at this point, but I can't seem to be able to solve this issue. I have an Interface ILinkHandler<T> and 4 other handler classes (inheriting from that interface) that validate different structures of links. From that interface, I have a Task<List<T>> Validate() function that does the validation of links and returns a Task> of results. Depending on T , I return a different model on Validate() (I have 4 different models). My console app does the following. It calls

问题 I'm working on a game for an assignment and I've ran into an issue with function overriding in C++. I have the following structure: class GameEntity { public: bool GameEntity::TakeHit(int dmg); }; class Enemy : public GameEntity { bool Enemy::TakeHit(int dmg); }; When from another class I create an instance of an Enemy, store it in a GameEntity vector, then call TakeHit() on it, it's calling the GameEntity version of it. I'm used to Java where this would call the other version, am I doing

问题 In my SpriteKit game, I want to add a property observer on the fieldBitMask property for the SKPhysicsBody of my sprites. I want to be informed when the fieldBitMask property changes so that I can take some action. I overrode SKPhysicsBody but when I tried assigning the overridden class to a sprite node like a normal SKPhysicsBody object I got a bunch of errors. I also thought about making an extension for SKPhysicsBody, but Apple documentation says, “Extensions can add new functionality to a

问题 I've an app that changes it's behaviour with the date. On my mock tests I need to override the new Date() function to test all the scenarios. Does anyone know how to override it? I already tried to use the executeScript to change the return value but it doesn't work. browser.driver.executeScript('' + 'Date = function(){return new Date(2012, 0, 20)};' ); 回答1: The replacement function depends on the original Date that's been replaced, so keep a reference to it in a closure, e.g.: var Date =

问题 I'm a beginner to c# programming and recently started working on a bachelors degree. What I'm trying to say is, I'm new. I have marked the place where I have the problem. The problem is that I don't understand why I need to put override in the code at all. There is 2 var of the type object (first and rest). public Pair() { first = rest = null; } public Pair(Object o) { first = o; rest = null; } public Object First() { return(first); } public Object Rest() { return(rest); } public Pair Connect