Hi, I was wondering why in java constructors are not inherited? You know when you have a class like this: public class Super { public Super(ServiceA serviceA, ServiceB serviceB, ServiceC serviceC){ this.serviceA = serviceA; //etc } } Later when you inherit from Super, java will complain that there is no default constru...
public function __construct($input = null) { if (empty($input)){ return false; } and then there's some constructor code... what I would like to do is for the class to not initialize if I pass an empty variable $classinstance = new myClass(); I want $classinstance to be empty (or false) I think this is not possible like this, Wha...
The title may be a bit ambiguous, but I couldn't think of a better way to word this. I realize that I can not call a derived constructor prior to calling a base constructor, but can I somehow modify / create parameters values prior to passing them to the base? For example, public enum InputType { Number = 1, String = 2, Da...
Let's say I have some classes like this: abstract class View(val writer: XMLStreamWriter) { // Implementation } class TestView(writer: XMLStreamWriter) extends View(writer) { // Implementation } Most subclasses of View are not going to take different constructor arguments. I would like to be able to write something like this:...
From what I can gather from Google, I must have syntax/parsing error but I can't seem to locate it.. This is my header file: #include <fstream> #include <iostream> #include <vector> #ifndef DATA_H #define DATA_H #include "Data.h" #endif vector<Data*> DataReader(); // This is line 11, where the error is.. And this is the .cpp fil...
Having been given the all clear to move code from my Page_Loaded method to the constructor (See HERE), i am now encountering errors on my Linq to entities query. It is now causing a nullreferenceexception and i can't figure out why at the moment. See below for the exception location. public Building() { InitializeComponent(); l...
I am trying to use Spring.NET with a C# application to populate a parameter array (params keyword) constructor argument that is of a complex Type (call it SecretCode, which happens to be an enumerated type.) Can someone help point me to the documentation to configure the XML file to do this? For reference, here are relevant code snippe...
In the following code: import java.io.*; public class MyClass1 { MyClass1() { System.out.println("base class"); } public void print() { System.out.println("base print"); } } class ChildClass extends MyClass1 { public ChildClass() { System.out.println("child class"); } ...
I really can't believe I couldn't find a clear answer to this... How do you free the memory allocated after a C++ class constructor throws an exception, in the case where it's initialised using the "new" operator. E.g.: class Blah { public: Blah() { throw "oops"; } }; void main() { Blah* b = NULL; try { b = new Bla...
Consider a layered application where the DataLayer has a certain class with all the data access stuff in it, and above that the business layer has a class which can take in the constructor a data object, and has other overloads as well. Ex: namespace Datalayer { public class dataObject { // all the class here } } ...
I'd like to create several similar services which can be destinguished and accessed by their names (=keys). For the service implementation I want to use classes with c'tor dependencies like this: public interface IXYService { string Tag { get; set; } } public class _1stXYService : IXYService { public _1stXYService(string Tag) { ...
If a public constructor in an abstract class can only be called by their derived classes it should be functionally equivalent to a protected constructor. Right? Is there any difference in declaring a public constructor, instead of a protected one, in an abstract class? What would you use it for? Why the compiler doesn't complaint? Than...
I'm new to IOC containers, and I'm getting started with NInject. What do you if you want your constructor to have parameters that are not services and don't need to be instantiated by the IOC container? For example: public class Person { private readonly string _name; private readonly IPersonRepository _repository; public...
how could I tell STL, specifically for the method resize() in vector, to initialize objects with a constructor other than default, and with which parameters? I mean: class something { int a; something (int value); } std::vector<something> many_things; many_things.resize (20); more generally, how could I force STL to use my ...
If yes could you give an example of a type with parameterless and "parameterfull" constructor. Is that something you would recommend using or does F# provide some alternative more functional way. If yes could you please give an example of it? ...
I am trying to implement a DateTime class in C++: class DateTime { public: DateTime(); DateTime(time_t ticks); DateTime(int day, int month, int year); DateTime(int day, int month, int year, int hour, int minute, int second); //... private: time_t ticks; int day; int month; //... } then in applicati...
I know STL containers like vector copies the object when it is added. push_back method looks like: void push_back ( const T& x ); I am surprised to see that it takes the item as reference. I wrote a sample program to see how it works. struct Foo { Foo() { std::cout << "Inside Foo constructor" << std::endl; } Foo...
The outcome of this code should be "huugiin zardal: 3", but it doesn't work. Please help. And also is there any easy way to write it? class Cost3{ int a; int u; int x; Cost3(int a,int u,int x){ } } class FC1 extends Cost3{ FC1(int a1, int u1, int x1){ super(a1,u1,x1); a=a1; u=u1; x=x1; } public int huugiin_...
Does the code below smell? I'm refactoring some code and have discovered this circular relationship where foo needs a class which needs an interface which foo itself implements. In the real code, foo is a Silverlight UserControl and ifoo has methods to do UI type things like raise a dialog box (eg ShowMessage). The needsAnIfoo class is ...
Let's say you have a class class C { int * i; public: C(int * v):i(v) {}; void method() const; //this method does not change i void method(); //this method changes i } Now you may want to define const instance of this class const int * k = whatever; const C c1(k); //this will fail but this will fail be...