Possible Duplicate: When do you use the this keyword? Hello, I understand that the "This" keyword is used to refer to an instance of the class, however, suppose I have a class called Life, which defines two fields, the person (their name) and their partner(their name): class Life { //Fields private string _person; ...
I'm fairly new to C++, and I'm not sure about this one. Have a look at the following example which sums up my current problem. class Foo { //stuff }; class Bar { Foo foo; }; So Bar constains a full Foo object, not just a reference or pointer. Is this object initialized by its default constructor ? Do I need to explicitly call...
I was wondering, what is the preferred way to construct a new object in C#? Take a Person class: public class Person { private string name; private int age; //Omitted.. } Should I create it to use: New Person("name", 24); or New Person() { Name = "name", Age = 24 }; Is it just a matter of taste or is there a good...
Here's a constructor for my Game class: // Construct a Game to be played with player on a copy of the board b. Game(const Board& b, Player* player) { ... } Here's how I'm using the constructor: Player p("Player Name"); Board b(6,3); Game g(b, &p); How does this work? Is b being copied? If I want to save a pointer to player, shou...
public class PhotoList : ObservableCollection<ImageFile> { public PhotoList() { } **//this is the line that I dont recognise!!!!!!!!!!** public PhotoList(string path) : this(new DirectoryInfo(path)) { } public PhotoList(DirectoryInfo directory) { _directory = directory; Update(); } public...
What are the advantages and when is it appropriate to use a static constructor? public class MyClass { protected MyClass() { } public static MyClass Create() { return new MyClass(); } } and then creating an instance of the class via MyClass myClass = MyClass.Create(); as opposed to just having a pub...
Hello, if I compile (under G++) and run the following code it prints "Foo::Foo(int)". However after making copy constructor and assignment operators private, it fails to compile with the following error: "error: ‘Foo::Foo(const Foo&)’ is private". How comes it needs a copy constructor if it only calls standard constructor at runtime? #i...
Here's a Clone() implementation for my class: MyClass^ Clone(){ return gcnew MyClass(this->member1, this->member2); } Now I have about 10 classes derived from MyClass. The implementation is the same in each case. Owing to the fact that I need to call gcnew with the actual class name in each case, I am required to creat...
I'm maintaining some C# 2.0 code and the programmer uses a pattern of reading a collection of business objects by opening a datareader and then passing it to the object's constructor. I can't see anything obviously wrong with this but it feels bad to me. Is this OK to do? private static void GetObjects() { List<MyObject> objects = ...
E.g. which way is better class Foo { private string _Bar ; Foo ( string bar) { _Bar = bar ; } public string Bar { get { return _Bar ; //more logic here } set { _Bar = value ; //more logic could be added } } } OR class Foo { private string _Bar ; Foo ( string bar) { this.Bar = bar ; } publ...
Hello guys, I am new to JavaScript OOP. Can you please explain me what the difference is between the following blocks of code. I tested and both blocks work. What's the best practice and why? First block: function Car(name){ this.Name = name; } Car.prototype.Drive = function(){ document.write("My name is " + this.Name + " and...
Hello, I'm new to C++ and I have a question... I tried answering the question myself by making a test application... in debug, the class B initialization generates less assembly code, but in release mode, I can't really say... it optimizes the initializations away :( Let's say I have two classes: class A { public: int a, b, c, d;...
If I use access="remote" for binding a cfselect to a cfc, then I lose the ability to have an Init() constructor. <cfselect name="CityID" bind="cfc:Components.City.View1({StateID})" value="CityID" display="CityName" bindonload="yes" /> I'm used to passing the datasource name to the Init function when I instantiate a component, like so:...
Consider this - a base class A, class B inheriting from A, class C inheriting from B. What is a generic way to call a parent class constructor in a constructor? If this still sounds too vague, here's some code. class A(object): def __init__(self): print "Constructor A was called" class B(A): def __init__(self): ...
Let's suppose I have an interface named "Controller". Several classes implement this interface and I don't know these classes (e.g. the class names are located in an xml-file). Now for this Controller-implementing classes to work they have to get some references to other objects (maybe data objects). And this is my question, namely what ...
Hello, i have some questions about the HashCode of immutable types. May i "pre"-generate the HashCode of an immutable type in the constructor or are there any reason not do that? Should i always generate the Hashcode again, when the method GetHashCode() is called? Here´s a sample class : public class Id { private re...
Hello, i have a question. There is application class in my program. It is inherited from QtGui.QMainWindow. In ini I call my own method which works with graphic. And it should be called before resize event. How can i do that? Thanks. EDIT: As you can se here the value of resize event is 14, and show event is 17. So i should find event w...
Is it possible to exit gracefully out of a constructor in php? Something to the effect of class Foo { function __construct() { $active = false; if(!$active) { return false; } } } I'm trying to accomplish this because I want to check to see if any of the methods in the class should run based on a configuration ...
I have code like this: class MapIndex { private: typedef std::map<std::string, MapIndex*> Container; Container mapM; public: void add(std::list<std::tring>& values) { if (values.empty()) // sanity check return; std::string s(*(values.begin())); values.erase(values.begin()); i...
Hello everyone, my question is rather a design question. In Python, if code in your "constructor" fails, the object ends up not being defined. Thus: someInstance = MyClass("test123") #lets say that constructor throws an exception someInstance.doSomething() # will fail, name someInstance not defined. I do have a situation though, wher...