class-hierarchy

I am "playing" with virtual inheritance in C++, and I want to know how a class object is laid out. I have those three classes: class A { private: int a; public: A() {this->a = 47;} virtual void setInt(int x) {this->a = x;} virtual int getInt() {return this->a;} ~A() {this->a = 0;} }; class B { private: int b; public: B() {b = 48;} virtual void setInt(int x) {this->b = x;} virtual int getInt() {return this->b;} ~B() {b = 0;} }; class C : public A, public B { private: int c; public: C() {c = 49;} virtual void setInt(int x) {this->c = x;} virtual int getInt() {return this->c;} ~C() {c = 0;} }; (I

I was looking for a diagram which shows the built in types of javascript like Function and String but on google I keep finding diagrams with the browser-related stuff like Window . I'm just looking for the pure js object diagram. I know about the ECMA specification but I'm looking for a diagram because I'm a visual type. There's not much depth to the JavaScript types to speak of, the diagram would be fairly flat. It's basically (UML at the end): primitive string primitive number primitive boolean the Undefined type, which has exactly one instance: undefined the Null type, which has exactly one

struct A { void f(int x) {} }; struct B { template<typename T> void f(T x) {} }; struct C : public A, public B {}; struct D { void f(int x){} template<typename T> void f(T x) {} }; int main(int argc, char **argv) { C c; c.f<int>(3); D d; d.f<int>(3); } What is the reason for which calling d.f is fine, but c.f gives error: request for member ‘f’ is ambiguous error: candidates are: template<class T> void B::f(T) error: void A::f(int) The first part is due to member name lookup, that's why it fails. I would refer you to: 10.2/2 Member name lookup The following steps define the result of name

I've got a somewhat primitive framework I've been using for most of my projects, but a general design issue came to mind that I haven't been able to work out yet. For a given application, should I separate the application-specific class structure from the framework's structure, or is building on top of the framework not such a bad thing? For example, say I had a framework with a base Controller class and extended it for a given part of my application. Which arrangement makes the most sense, and why? Class Structure A: Intuitive, easy to find source files when debugging. File naming/directory

I'm trying to build a hierarchy of objects using SQLAlchemy in the Pyramid framework. I have a working hierarchy set up - currently a C object has B as its parent, which has A as its parent. But I need to change it so that model B can have A, B, or C as it's parent, etc. I tried using an Association table but the foreign keys used in it also links to only one type of object. I'd also like to keep the current Children and Parent relationship attributes. This is my current models.py file: DBSession = scoped_session(sessionmaker(extension=ZopeTransactionExtension())) Base = declarative_base()

I was recently looking through some open source code PicketLink code. If you take a look at this class , you'll see a number of concrete methods in an abstract class that do nothing. Is there any purpose whatsoever for this? I thought about two things: If the method needs to be overriden by subclasses and not defined in the parent abstract class, why not simply make it abstract? If only some of the child classes actually need to implement the method, wouldn't this indicate the need for a restructuring of the class hierarchy so that children are not forced to have methods that are not

In an iOS app I am writing I want to traverse a class hierarchy to make an inventory of all subclasses. My intent is to use each subclass type as a key -- via NSStringForClass() -- in a dictionary. My motivation is to be able to automatically discover all variants of a base class so that I can call methods associated with that class. For reasons of division of labor I prefer not to use method overriding here. Is it possible to do such a traversal? How would it work? Here's an example. This method will return all subclasses descending from the class you send the message to. @interface NSObject