As an example, when I'm using an NSMutableDictionary, I know it inherits all the methods of NSDictionary, but how can I know/trust that it has overridden the behavior of those methods if I want to use NSDictionary methods (such as +dictionaryWithObjectsAndKeys) to create my mutable dictionary instance? More generally, is it the Framewo...
Suppose I have a namedtuple like this: EdgeBase = namedtuple("EdgeBase", "left, right") I want to implement a custom hash-function for this, so I create the following subclass: class Edge(EdgeBase): def __hash__(self): return hash(self.left) * hash(self.right) Since the object is immutable, I want the hash-value to be c...
I have a bunch of Repository classes which all look a bit like the following. Note that I have omitted certain methods; I just want you to get a flavour. public class SuggestionRepository : ISuggestionRepository { private IUnitOfWork _unitOfWork; public SuggestionRepository(IUnitOfWork unitOfWork) { _unitOfWork = un...
I'm struggling with some Generic constraint issues when trying to implement a library that allows inheritance and hoping someone can help. I'm trying to build up a class library that has 3 flavours to it, each building on top of the other. To me it seemed like a perfect opportunity to use Generics as I can't quite do what I want throug...
I really don't get it. If the base class is abstract and only intended to be used to provide common functionality to public subclasses defined in the assembly, why shouldn't it be declared internal? I don't want the abstract class to be visible to code outside the assembly. I don't want external code to know about it. ...
In this post I talked about using a generic base class to enable me to create repository classes without duplicating loads of basic plumbing code. Each Repository is accessed through an interface. In the code below, I will only show one of the methods for the sake of brevity: Interface: IQueryable<Suggestion> All { get; } Generic ba...
Hey guys, I am trying to implement a UIViewController hirarchy where the top most UIView Controller implements just a few basic methods the second level view controller a few more methods (depending on which one it is) and the last one on the third level has some more customized methods and also a nib file whereas none of the UIView Con...
Hello, I would like to understand why when I call protected method, declared and implemented in base class, from derived class via pointer to base class I get compilation error (C2248) and when I call it from derived class via pointer to derived class instance, compilation pass. I understand it is part of the language but I want to und...
In our data layer, we need to create "style" objects that could inherit their values from other "style" objects. Example scenario 1: class Style { string Name; string ParentName; // Other properties go here. } So, when there is a list of such styles, a style with a parent name should inherit it's style values from it's paren...
package a; class hello{ } package b; import a.*; class hello extends hello{ } please tell me what is the result?? ...
I want to inherit from some kind of array/vector/list class so that I can add just one extra specialized method to it.... something like this: public class SpacesArray : ArrayList<Space> { public Space this[Color c, int i] { get { return this[c == Color.White ? i : this.Count - i - 1]; } ...
Can we hide the derived class public method so that it is not accessible in Main() function in C#. We can't change the accessors of the derived class method. public class A { public void Add() { } } public class B : A { public void Multiply() { } } In main() method in C# B b = new B(); b.m...
Lets have this situation (in c++, in c# classes A,B are interfaces): class A { virtual void func() = 0; }; class B { virtual void func() = 0; }; class X: public A, public B { virtual void func(){ var = 1; } int var;}; X * x = new X; // from what I know, x have 2 vtables, is this the same in c#? A * a = (A*)x; // a == x B * b = (B*)x; /...
For illustration purposes let us say I'm building a simple blog application and have a class called Blog: Class Blog(){ __constructor(){ connectToDatabase(); } } Class BlogPost($id) extends Blog { public $title; public $body; etc. } The blogpost class can be instantiated as an object representing a particular...
I am new to programming with OOP, I am trying to properly use the concept of inheritance. Here is the code here is what I tried (Link Here) public class Base { //Type? public abstract static object Adapter(); public static DataTable GetWOCost(DateTime Date, string WO) { Application.UseWaitCursor =...
Entity has a member var of type std::array. Student inherits from Entity, and will need to initialize the std::array member var it inherited. Below is the code I'm using to do this, but it involves casting a brace-enclosed list to std::array. I'm not sure this is the correct or optimal way to do this. Using a brace-enclosed or double...
With the structure.. abstract class Unit { int Id; } class Measure : Unit { int Current; int Baseline; } class Weight : Unit { int Minimum; int Maximum; int Current; } I basically want to add an "Add" method for adding, say, two Measures together, or adding two Weights together. But it needs to be in the Unit base class. So ba...
Edit: Found duplicate I've whittled down some problem code to the simplest working case to illustrate the following: my typedef in a pure abstract base class is not being inherited by the derived class. In the code below I'd like to inherit the system_t typedef into the ConcreteTemplateMethod: #include <iostream> // pure abstract te...
I have a parent project with 5 children having also dependencies between each other. I used both inheritence with <parent> element in the children pom.xml and aggregation with <module> element in the parent. My parent pom looks like this: <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-ins...
Hi, i am new to C++ I am creating a custom QList of type Account* called AccountList through inheritance. My interface declaration for AccountList is as follows: class Client { public: Client(QString firstName, QString lastName, QString address1, QString address2, QString postalCode); QString toString(); priva...