For example: public class A : A.B { public class B { } } Which generates this error from the compiler: Circular base class dependency involving 'A' and 'A.B' I always figured a nested class behaved just like a regular class except with special rules concerning accessing the outer class's private members, but I guess there'...
Suppose I have a class 'Application'. In order to be initialised it takes certain settings in the constructor. Let's also assume that the number of settings is so many that it's compelling to place them in a class of their own. Compare the following two implementations of this scenario. Implementation 1: class Application { Applic...
I've got a custom TObjectList descendant in Delphi 2009, and I'd like to play with its enumerator a bit and add some filtering functionality to the MoveNext method, to cause it to skip certain objects. MoveNext is called by DoMoveNext, which is a virtual method, so this shouldn't be difficult to override... except for one thing. The TEn...
The current class library I am working on will have a base class (Field) with over 50 specific "field" types which will inherit from "Field" and nested for maintain readability. For example... abstract class Field { public int Length { get; set; } public class FieldA : Field { public static void DoSomething() ...
I have a base class that has an abstract getType() method. I want subclasses to be able to implement this method and provide the actual class to use. In code, something like the following: public abstract class A { public static interface Tile; protected abstract Class<Tile> getTileClass(); } public class B extends A { p...
Hi There! I use nested classes for accessing private members in JUnit tests. They are alaways named "TestProxy". I would like to remove them at Build time using maven2, to not include it into the jar file. -Is there any configuration option? -Can it be done with a plugin? If so, a prototype would be nice! ;-) Thanks Edit: Why us...
Why is this? I would find it really nice to be able to have some extension methods locked down to be used only within one of my classes. Don't really want to have certain extension methods available everywhere... and they look so much nicer than regular static methods :P For clarification: The reason I want these extension methods is...
My coworker suggested making several of the Eclipse code-formatting and warning settings to be more rigorous. The majority of these changes make sense, but I get this one weird warning in Java. Here's some test code to reproduce the "problem": package com.example.bugs; public class WeirdInnerClassJavaWarning { private static class ...
Until very recently I hadnt twigged that there was a difference between a normal class, and an inner class / sub class. What is the relationship between an instance of an inner class and an instance of its containing class, and what is the purpose of inner classes / what makes them different? ...
Please, help me to create a nested struct with an array. How do I fix this code? class CMain { public: CMain(); ~CMain(); private: struct { CCheckSum() : BufferSize(500) {memset(Buffer, 0, BufferSize);} const int BufferSize; char Buffer[BufferSize]; }Sm...
I've created a class witch contains a typed list and derives to another class I created. This looks as follows: namespace MyIntegretyCheck.Common { /// <summary> /// Description of PolicyErrors. /// </summary> public partial class PolicyErrorEndingDates { public int ID_P {get;set;} public DateTime DT_S_E {g...
Hi, I'm currently doing some refactoring (+ adding new features) to some of our framework classes. The situation is that we have a single (god-like) class which does a bunch of logic we'd like to split up. The class represents something like a validation rule for fiscal codes. So it does validation of the names of the person, birthdate ...
If I look at some classes in the framework, using reflector, I can see that forms and user controls are made private and nested into a parent class. For instance, I have a control which makes use of pop-up form that is specific to that control. At the moment, I make the pop-up form friend accessible. If I wanted to do it the framework w...
Specifically, can anyone give me concrete examples of when or when not to use nested classes? I've known about this feature since forever, but never had a reason to use it. Thanks. ...
I’m working with a poorly-engineered API. I have a class that I need to serialize, and I have control over the makeup of the class, but not the types that make up the properties the class is serialzing. An example is below: <Project> <SomeProperty1 /> <Install> <DefaultStep></DefaultStep> </Install> <Uninstall> <DefaultS...
I’m trying to do the following: class Animal { class Bear : public Animal { // … }; class Giraffe : public Animal { // … }; }; … but my compiler appears to choke on this. Is this legal C++, and if not, is there a better way to accomplish the same thing? Essentially, I want to create a cleaner...
I have an abstract base class which contains a private nested implementation. visual c++ is giving me the following error when I try to instantiate the non-abstract nested implementation: error C2259: 'node::empty_node' : cannot instantiate abstract class (line 32) as far as I can tell, I've overridden all the abstract members of the ...
Please retag this question to include languages to which it is relevant So my java book had a whole chapter on nested classes, but ended on the note that you should only really use them when it comes to "modeling composition relationships and implementing internals of a class you want to hide". So lets discuss when you would want to use...
I am not sure if there is already a nomenclature for this, but for the sake of this question lets define two terms: peer implementation or nested implementation to illustrate how you implement collection classes in a data model that contains many parent/child entity relationships. I use the term peer to describe the scenario where you i...
Hi, Is it possible to specify that members of a nested class can be accessed by the enclosing class, but not other classes ? Here's an illustration of the problem (of course my actual code is a bit more complex...) : public class Journal { public class JournalEntry { public JournalEntry(object value) { ...