multiple-inheritance

问题 We have used a homegrown version of object oriented coldfusion for a while and I'm just starting to experiment with cfc's and how it "should" be done... If I understand correctly, cfinterface defines the signature of functions, and any class that implements that interface must have their own functions to do whats defined in the interface. I'm kind of trying to do the opposite - the interface doesn't just define the function's signature, but also defines the logic of the function and anything

问题 In a Symfony2 application I have a MainBundle and distinct bundles which can be enabled or not. In the MainBundle I need to have the Model and a basic Entity . In an OtherBundle an Entity with the same table name than Entity in MainBundle . Fixtures in MainBundle need to be loaded with or without the other bundles than MainBundle : MainBundle - Model - Entity (Table name "test") - Fixtures OtherBundle - Entity (Table name "test") - Fixtures OtherBundle2 - Entity (Table name="test") - Fixtures

问题 Is multiple inheritance possible in VB .Net? If so, what is the syntax? 回答1: Short answer: No Slightly longer answer: Yes, if you inherit multiple interfaces, and a single base class. Since this is usually the reason for MI (you want to implement multiple interfaces), it's usually enough. However, in those rare instances where "real" MI is useful, .NET prevents you from doing it. 回答2: It's possible in a restricted manner in VB.Net in the same way that it is in C#: via Interfaces. Since an

问题 Is multiple inheritance possible in VB .Net? If so, what is the syntax? 回答1: Short answer: No Slightly longer answer: Yes, if you inherit multiple interfaces, and a single base class. Since this is usually the reason for MI (you want to implement multiple interfaces), it's usually enough. However, in those rare instances where "real" MI is useful, .NET prevents you from doing it. 回答2: It's possible in a restricted manner in VB.Net in the same way that it is in C#: via Interfaces. Since an

问题 We all know why Java does/should not have multiple inheritance. So this is not questioning about what has already been debated till-cows-come-home. This discusses what we would do when we wish to create a class that has the characteristics of two or more other classes. Probably, most of us would do this to "inherit" from three classes. For simplicity, I left out the constructor.: class Car extends Vehicle { final public Transport transport; final public Machine machine; } So that, Car class

问题 Please don't question the really odd hierarchy of workers in this code here, I have no idea why anyone would want something like this, but I decided to give myself an exercise in Multiple Inheritance, just to be sure I fully understood it. So here's the result. using namespace std; class Employee { protected: string name; public: string getname() { return name; } void setname(string name2) { name = name2; } Employee(string name2) { name = name2; } Employee(){} }; class Manager : public

问题 I was trying to learn the concepts of multiple-inheritance in Python. Consider a class Derv derived from two classes, Base1 and Base2 . Derv inherits members from the first base class only: class Base1: def __init__(self): self.x=10 class Base2: def __init__(self): self.y=10 class Derv (Base1, Base2): pass d = Derv() print (d.__dict__) The result is { 'x' : 10 } and reversing the order of inheritance gives only { 'y' : 10 } . Shouldn't the derived class inherit attributes from both the base

问题 I want to be able to define a method with the same name that has a different implementation if the argument is an Iterable[T1] vs a function: T1 => T2 However, many classes that implement Iterable also implement PartialFunction For example: object FunList { def foo(itr: Iterable[Int]) = println("hello") def foo(f: (Int => Int)) = println("Goodbye") } scala> FunList.foo(List(1)) <console>:9: error: ambiguous reference to overloaded definition, both method foo in object FunList of type (f: Int

问题 I have a reference class Child which inherits from parents SuperA and SuperB . When in the initialize method of Child , I would like to invoke the initialize methods of both SuperA and SuperB in turn. Thus, for instance, I have: SuperA <- setRefClass("SuperA", fields = list(a = "ANY"), methods = list( initialize = function(a) { print(a) initFields(a = a) } ) ) SuperB <- setRefClass("SuperB", fields = list(b = "ANY"), methods = list( initialize = function(b) { print(b) initFields(b = b) } ) )

问题 I'm getting build errors when passing an object that implements multiple interface to a function that requires only one of the interfaces. I'm developing a communication package. The package has a Receiver class and a Sender Class. The Receiver class uses a notification interface Receive_Notifier (function object) for handling notifications. Likewise the Sender class uses a notification interface Send_Notifier to handling notifications. interface Send_Notifier { void sending_text(string text)