inheritance

问题 Say you were writing the original C# Object class and you wanted the following functionality: object1 == object2 will compare references unless this operator is overridden object1 != object2 will always return the inverse of the object's ACTUAL object1 == object2 So, for example, if I have a Bunny class (derived from Object ) which uses ear lengths as its equals method, then the notequals method (inherited from Object ) should return true if the bunnies have different ear lengths. The problem

问题 I'm trying to write a subclass a masked_array . What I've got so far is this: class gridded_array(ma.core.masked_array): def __init__(self, data, dimensions, mask=False, dtype=None, copy=False, subok=True, ndmin=0, fill_value=None, keep_mask=True, hard_mask=None, shrink=True): ma.core.masked_array.__init__(data, mask, dtype, copy, subok, ndmin, fill_value, keep_mask, hard_mask, shrink) self.dimensions = dimensions However, when now I create a gridded_array , I don't get what I expect: dims =

问题 I've got the BaseComponent which got some dependencies injected. The first dependency EntityService is correct and necessary. But AnyOtherService is only used inside the abstract BaseComponent . Instead of injecting it inside the ChildComponent , where it is not used, I'd like to inject it only inside BaseComonent . Why do I have to push it through the ChildComponent towards the BaseComponent ? The best solution would be to encapsulate it inside the BaseComponent . base.component.ts export

问题 I've got the BaseComponent which got some dependencies injected. The first dependency EntityService is correct and necessary. But AnyOtherService is only used inside the abstract BaseComponent . Instead of injecting it inside the ChildComponent , where it is not used, I'd like to inject it only inside BaseComonent . Why do I have to push it through the ChildComponent towards the BaseComponent ? The best solution would be to encapsulate it inside the BaseComponent . base.component.ts export

问题 Consider the following abstract class: class Abstract { public: // ... virtual bool operator==(const Abstract& rhs) const = 0; // ... }; Now suppose I'm creating multiple derived classes from this abstract class. However, each one uses a different algorithm when comparing with its own type, and a generic algorithm when comparing with any of the other derived classes. Between the following two options, which would be the better, more efficient option? Option A: class Derived : public Abstract

问题 I'm trying to subclass web.form.Form from the webpy framework to change the behavior (it renders from in a table). I tried doing it in this way: class SyssecForm(web.form.Form): def __init__(self, *inputs, **kw): super(SyssecForm, self).__init__(*inputs, **kw) def render(self): out='<div id="form"> ' for i in self.inputs: html = utils.safeunicode(i.pre) + i.render() + self.rendernote(i.note) + utils.safeunicode(i.post) out += "%s"%(html) out += '"<div id="%s"> %s %s</div>'% (i.id, net.websafe

问题 guys! So I recently started learning about python classes and objects. For instance, I have a following list of strings: alist = ["Four", "Three", "Five", "One", "Two"] Which is comparable to a class of Numbers I have: class Numbers(object): One=1 Two=2 Three=3 Four=4 Five=5 How could I convert alist into alist = [4, 3, 5, 1, 2] based on the class above? My initial thought was to create a new (empty) list and use a for loop that adds the corresponding object value (e.g. Numbers.One ) to the

问题 Is it possible to pass a value and a constant enum to the base constructor of a class? For example: enum CarBrand { Volkswagen, Ferrari, Bugatti }; class Car { public: Car(int horsePower, CarBrand brand) { this->horsePower = horsePower; this->brand = brand; } ~Car() { } private: int horsePower; CarBrand brand; }; class FerrariCar : public Car { public: // Why am I not allowed to do this ..? FerrariCar(int horsePower) : Car(horsePower, CarBrand.Ferrari) { } ~FerrariCar(); }; Because I'm

问题 I have several WCF services, and those services share some common methods. So, I have created a base class (not a WCF service) with those methods and made all the WCF services to inherit from this class. Something like this: [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.PerCall)] public abstract class BaseService And one of the WCF services: public class ExampleService : BaseService, IExampleService { I'm using the ServiceBehavior

问题 I am a little new to JavaScript, and I know that there are different inheritance models that can be used. I have a project I used KineticJS for and I noticed in their changelog that they changed the inheritance model with the release of v3.10.3 of the project, so that we can 'more easily extend or add custom methods to Kinetic classes' I have done some searching for this, but I cannot seem to find a clear example of this anywhere. I was wondering if anyone could tell me what would be the