I am trying to inherit application-level styles for a certain Window in my WPF application, but I'm having trouble getting it to inherit rather than simply override the existing styles. In App.xaml (under the App.Resources element) I define a style as such: <Style TargetType="Button"> <Setter Property="Padding" Value="6"/> <Set...
I am extending a class from a external library. Here is my code: Header file: Manager+MyCategory.h #import "Manager.h" #import "Element.h" @interface Manager (myCategory) - (Element*) elementWithTag:(NSInteger)tag; @end Implementation file: Manager+MyCategory.h file @implementation Manager (myCategory) - (Element*) elementWithT...
I'm trying to properly encapsulate a class A, which should only be operated on by class B. However, I want to inherit from class B. Having A friend B doesn't work -- friendship isn't inherited. What's the generally accepted way of accomplish what I want, or am I making a mistake? To give you a bit more color, class A represents a com...
function main() { this.one = 1; } main.prototype = { display: function() { console.log(this.one); return this; } }; function addition() { main.call(this); } addition.prototype = new main; addition.prototype.constructor = addition; addition.prototype = { add: function(x) { this.one += x; return this; } }...
I am writing an ASP.NET 2.0 app. I need touse several databases, so I am using the DbProviderFactory to I can dynamically change the provider type. Although it works, I find the parameter adding a bit verbose. Because the createParameter method doesn't accept parameters itself, I end up with several lines of code like this for each param...
Consider the following example. I have an interface MyInterface, and then two abstract classes MyAbstractClass1 and MyAbstractClass2. MyAbstractClass1 implements MyInterface, but MyAbstractClass2 does not. Now I have three concrete classes. MyConcreteClass1 is derived from MyAbstractClass1 but does not implement MyInterface. MyConcr...
I'm getting the error "T does not contain a definition for Id" below in the specified line, even though when I debug, I see that "item" does indeed have a property "Id" in its base class. How do I specify here that I want C# to look in the item's base class for Id (and why doesn't it do this automatically?)? //public abstract class Ite...
Hello everyone I have added an EventHandler for the Click-event to a picturebox but on runtime this handler is never called (the debugger shows me that it is added to the control directly but when I click on the picturebox nothing happens). I assume it has something to do with my inheritance. I have a usercontrol called AbstractPage (i...
Basically, I have a model where I've created a superclass that many other classes share, and then each of those classes has some unique features that differ from each other. Let's say class A is the superclass, and class B, C, and D are children of that class. Both class B and class C can have multiples of class D, however I've seen tha...
so I'm finally understanding prototype and how to use it. I'm sure that I'm still trying to solve this as a java inheritance problem, so if there is a more prototypal way to go about this let me know. If B inherits A I want B's constructor to first execute A's constructor. This is important for setting up B's local variables. At first I...
Here is some code outlining a problem I've been wrestling with. The final problem (as far as g++ is concerned at the moment) is that: "error: 'Foo-T' was not declared in this scope" when performing the Bar::Bar(...) constructor routine. Otherwise, the problem I'm attempting to learn my way through is one of setting base-class member type...
Before this is marked as duplicate, I'm aware of this question, but in my case we are talking about const containers. I have 2 classes: class Base { }; class Derived : public Base { }; And a function: void register_objects(const std::set<Base*> &objects) {} I would like to invoke this function as: std::set<Derived*> objs; registe...
I am trying to use a little inheritance in a Python program I am working on. I have a base class, User, which implements all of the functionality of a user. I am adding the concept of an unapproved user, which is just like a user, with the addition of a single method. The User class has some methods that return a User object. This wi...
This question is a furtherance of the one asked in this thread. Using the following class definitions: template <class T> class Foo { public: Foo (const foo_arg_t foo_arg) : _foo_arg(foo_arg) { /* do something for foo */ } T Foo_T; // either a TypeA or a TypeB - TBD foo_arg_t _foo_arg; }; template <...
I'm trying to create a CurrencyTextBox that inherits from TextBox. I'm seeing some really weird behavior that I just don't understand. After lots of testing, I think I can summarize as follows: In the class code, when I access base.Text (to get the textbox's text), I'm actually getting the return value of my overridden Text property. ...
Hi, Are attributes applied to an abstract method in a base class applied to the overridden versions in the child classes? I hope the question is clear enough without an example. ...
Hello all i have this : class A { public : A(int i ) : m_S(i) { m_Pa = new Foo(*this) ; } private : int m_S ; Foo* m_Pa; } and derived class class B : public A { public : B() : A (242) { // here i like to override the A class m_Pa member but...
I have two almost identical Beans. Bean "Item" contains a unique identifier (primary key), a name and an array that contains structs with data for different Users that are related to the "Item". Bean "User" contains a unique identifier (primary key), a firstname, a lastname and an array that contains structs with data of different Item...
The essence of the problem is, given a class hierarchy like this: class A { protected void MethodToExpose() {} protected void MethodToHide(object param) {} } class B : A { new private void MethodToHide(object param) {} protected void NewMethodInB() {} } class C : B { public void DoSomething() ...
I want to create a new type of field for django models that is basically a ListOfStrings. So in your model code you would have the following: models.py: from django.db import models class ListOfStringsField(???): ??? class myDjangoModelClass(): myName = models.CharField(max_length=64) myFriends = ListOfStringsField() # ...