I'm trying to write some metaprogramming code such that: Inheriting from some class foo<c1, c2, c3, ...> results in inheritance from key<c1>, key<c2>, key<c3>, ... The simplest approach doesn't quite work because you can't inherit from the same empty class more than once. Handling the "..." portion isn't pretty (since it's copy-pasta),...
Consider the following, only program body, syntax not correct: class super { func1();//the method which is to be be overridden } class sub1 extends super { func1(); } class sub2 extends sub1 { func1(); } class Main { main() } ...
I'm currently rewriting a free educational digital circuit simulator to add inertiality to its features. My problem is how to dispatch events to original classes adding a pre-elaboration to them. I have something like this: TC1 = class ID: integer; Connections : array [integer] of Pin; function Func1; virtual; function FuncN; en...
I hope this is a simple question. Can I inherit both an abstract class and it's implementation? That is, can the following be made to work? class A { virtual void func1() = 0; } class B { void func1() { /* implementation here */ } } class C : public A, public B { } I've tried a few variations, and am getting compile errors...
Well I was going to ask what the difference is but it's been answered before. But now I'm asking why did they make these differences? (I'm speaking about java here, I don't know if the same applies to other languages) The two things seem very similar. Abstract classes can define a method body whilst interfaces can't, but multiple interf...
Suppose I have the following: type blah is abstract tagged record element1 : integer; end record; type blah2 is abstract tagged record element2 : integer; end record; I'm hoping that it's possible that I can do something like this: type blah3 is abstract new blah1 and blah 2 with null record; So in theory I can now access blah3...
My program needs to make use of void* in order to transport data or objects in dynamic invocation situation, so that it can reference data of arbitrary types, even primitive types. However, I recently discovered that the process of down-casting these void* in case of classes with multiple base classes fails and even crashes my program af...
class Base { public: Base(){} Base(int k):a(k) { } int a; }; class X:virtual public Base { public: X():Base(10){} int x; }; class Y:virtual public Base { public: Y():Base(10){} int y; }; class Z:public X,public Y...
In my class design I ran into the following problem: class MyData { int foo; }; class AbstraktA { public: virtual void A() = 0; }; class AbstraktB : public AbstraktA { public: virtual void B() = 0; }; template<class T> class ImplA : public AbstraktA { public: void A(){ cout << "ImplA A()"; } }; class ImplB ...
A colleague and I are having a bit of an argument over multiple inheritance. I'm saying it's not supported and he's saying it is. So, I thought that I'd ask the brainy bunch on the net. ...
We have this situation: Window Keyboard ^ ^ | / ApplicationWindow so class Window { } class Keyboard { } class AppWindow : public Window, public Keyboard { } Now, Keyboard wants to access a property in ApplicationWindow, for example,...
i have been reading about multiple inheritance http://stackoverflow.com/questions/225929/what-is-the-exact-problem-with-multiple-inheritance http://en.wikipedia.org/wiki/Diamond_problem http://en.wikipedia.org/wiki/Virtual_inheritance http://en.wikipedia.org/wiki/Multiple_inheritance But since the code does not compile until th...
I want to create a class that takes two parameters. One should be typed simply as T. The other should be typed as something that extends both T and SomeInterface<T>. When I attempt this with public class SomeClass<T, S extends SomeInterface<T> & T> then Java complains with "The type T is not an interface; it cannot be specified a...
If I have two interfaces , both quite different in their purposes , but with same method signature , how do I make a class implement both without being forced to write a single method that serves for the both the interfaces and writing some convoluted logic in the method implementation that checks for which type of object the call is bei...
context 1: class D : public B1, public B2{}; context 2: B2 takes B1 to initialize: B2( B1 * ) //B2's constructor my question is in D's initialization list: D::D() : B1(), B2( ? )... What should be in ? I don't want to put " (B1*)this " in the ? place, because it's no good to use "this" in initialization list. And since B1 part ha...
This is a bit of an involved problem, so I'll do the best I can to explain what's going on. If I miss something, please tell me so I can clarify. We have a callback system where on one side a module or application provides a "Service" and clients can perform actions with this Service (A very rudimentary IPC, basically). For future refer...
I have multiple inheritance like this one: http://stackoverflow.com/questions/356128/can-i-extend-a-class-using-more-than-1-class-in-php (let's not discuss this approach itself please) and want my IDE to know about inherited class methods and properties. Is there a way to do it with PhpDoc? ...
Is Multiple Inheritance allowed at class level in PHP? ...
What is the difference between Multiple Inheritance and Polymorphism? In a Book I red a line saying there is no support for multiple inheritances at class level. This means you can't extend more than one class at a time. Which is contradicting the concept of Polymorphism, described in the same book as polymorphism is the process of...
I'm confused about an OOP feature, multiple inheritance. Does OOP allow Multiple Inheritance? Is Multiple Inheritance a feature of OOP? If Multiple Inheritance is a feature then why don't languages like C#, VB.NET, java etc. support multiple inheritance? But those languages are considered as strongly supported OOP language. Can anyone a...