If I have a parent class that is extended by lots and lots of other classes, and I want to make sure the parent class's constructor is ALWAYS run, is it a bad idea to declare the constructor final? I was thinking of doing something like this: class ParentClass { public final function __construct() { //parent class initial...
Possible Duplicate: Calling virtual functions inside constructors first of all below code is not working visual c++ , but workin with bloodshed output is 0 , but acc. to me it shud be 1 ; can anyone explain this #include<iostream> using namespace std; class shape { public: virtual void print() const =0; virtual double...
Flash is throwing an error saying that my constructor has 0 arguments when in fact, I have one. Below is my code. Thanks in advance for your help. package com.objects { import flash.display.Sprite; import flash.events.*; import flash.display.Stage; public class Ball extends Sprite { private var yDir = 1; private var xDir:N...
I'm trying to create a Date like this: date = new Date(year-1900,mon-1,day,hrs,min,sec); and Eclips gives me this warning: "The constructor Date(int,int,int,int,int) is deprecated". What does it mean for a constructor to be deprecated? What can I do? ...
For instance, if I have a class like this: namespace Sample { public Class TestObject { private Object MyAwesomeObject = new MyAwesomeObject(); } } Is there any benefit to set it up so that the property is set in the constructor like this? namespace Sample { public Class TestObject { priva...
Consider the following code: #include <vector> struct A { explicit A(int i_) : i(i_) {} int i; }; int main() { std::vector<int> ints; std::vector<A> As(ints.begin(), ints.end()); } Should the above compile? My feeling is that it should not, due to the constructor being marked explicit. Microsoft Visual C++ agrees, g...
As far as I know, in C#, there is no support for the "friend" key word as in C++. Is there an alternative way to design a class that could achieve this same end result without resorting to the un-available "friend" key-word? For those who don't already know, the Friend key word allows the programmer to specify that a member of class "X"...
According to Misko Hevery that has a testability blog. Developers should avoid 'holder', 'context', and 'kitchen sink' objects (these take all sorts of other objects and are a grab bag of collaborators). Pass in the specific object you need as a parameter, instead of a holder of that object. In the example blow, is this code smell? Sh...
Possible Duplicate: C# constructor execution order class Foo { public int abc; Foo() { abc = 3; } } class Bar : Foo { Bar() : base() { abc = 2; } } In the example above, when an object of Bar is created, what will be the value of BarObject.abc? Is the base constructor called first, o...
Hi! I just try to understand the behaviour of the following situation: template <typename T1> struct A{ template <typename T2> A(T2 val){ cout<<"sizeof(T1): "<<sizeof(T1)<<" sizeof(T2): "<<sizeof(T2)<<endl; } T1 dummyField; }; so - the class is templated with T1 and the constructor is templated with T2 now - ...
When you create a new Uri like this: New Uri(New Uri("http://example.com/test.php"),"?x=y") it returns: http://example.com/?x=y It was supposed to return: http://example.com/test.php?x=y according to the every major browser out there (I'm not quite sure what RFC says though). Is this is a bug or is there any other function out ...
Is it possible to create a constructor (or function signature, for that matter) that only accepts a string literal, but not an e.g. char const *? Is it possible to have two overloads that can distinguish between string literals and char const *? C++ 0x would kind-of allow this with a custom suffix - but I'm looking for an "earlier" sol...
Hello, I need to create a Set with initial values. Set<String> h = new HashSet<String>(); h.add("a"); h.add("b"); Is there a way to do it in one command? Thanks ...
Hello, I'm having a problem while using constructors with a Groovy class. I have a class Data in a file called Data.groovy with an inner class ContentEntry. I want to initialize ContentEntry instances from a Data method: static void initContent(nid, uid) { curContent = new ContentEntry() curContent.nid = nid; curContent.uid...
Could anyone tell me what I can include in the constructor? I know that I can do the following. function __construct(){ parent::Controller(); session_start(); } But I am wondering if I can add any variables, if statement etc. Thanks in advance. ...
Hello Group, I am working on a legacy framework. Lets say 'A' is the base-class and 'B' is the derived class. Both the classes do some critical framework initialization. FWIW, it uses ACE library heavily. I have a situation wherein; an instance of 'B' is created. But the ctor of 'A' depends on some initialization that can only be perf...
I have a class like so: public abstract class ClassA<T> { protected ClassA(IInterface interface) { if (interface== null) { throw new ArgumentNullException ("interface"); } } } I want to write a test which verifies that if I pass null in the exception is thrown: [Test] [ExpectedExcep...
This is kind of complicated so please bear with me. The Setup most of our code base is in VB.net. I'm developing a project in c# that uses a lot of the assemblies from the VB.net code. There are three relevant classes in VB.net Public MustInherit Class mdTable Public Sub New(ByVal sqlConnectionStr As String, Optional ByVal maxSec...
isnt this one automatically put by the compiler if i don´t put it in a subclass's constructor? that means i dont even should care about it? in some articles they put it out. and if i got 1 constructor with arguments, will this be THE constructor, or does it takes a constructor without argument list? ...
class TestClass { public: TestClass(int i) { i = i; }; private: int i; } class TestClass2 { private: TestClass testClass; } Why does the above code compile fine even when we have not provided a default constructor? Only if someone instantiates TestClass2 elsewhere in the code, do we get a compile error. What is the compil...