I'm not entirely sure how to implement objects in JS. Here is a constructor: function FooList(arg1, arg2, arg3, arg4, arg5, arg6, arg7) { alert("constructing"); this._arg1 = arg1; this._arg2 = arg2; this.refresh(); } I am trying to call it here: FOO_LIST = new FooList( arg1, arg2, arg3, arg4, arg...
Suppose I have some class C, and I inherit from it and name this class D. Do I always have to call C's default constructor as in this example: class C { public: C() { ... } }; class D { public: D() : C() { ... } }; Note that C has only the default constructor. Do I have to call it from D? I couldn't figure out...
I just came across a problem where the constructor of a class needs to allocate memory. So I happily wrote char *mem = static_cast<char*>(malloc(100*sizeof(*mem)));. But then I suddenly realized that in case of error I can't return error code (I am not using exceptions in my code). How can I solve this problem? Should I add an bool init...
Why does constructor not required in structure ? Why does GC don't remove structures ? ...
Early today I discovered function try-catch blocks (from here in fact) and then went on a bit of a research spree - apparently they're main use is it catch exceptions throw in by a constructor initialiser list. Anyway, this sent me thinking about failing constructors and I've got to a stage where I just need a little clarification. This...
Hi all, The default constructor of NSObject is this? -(id)init { return self; } thanks! ...
I have this code: #include <stdio.h> class A { public: A() { printf("A::A()\n"); } A(const A &a) { printf("A::A(A &a)\n"); } A &operator=(const A &a) { printf("A::operator=\n"); } }; class B : public A { public: B() { printf("B:B()\n"); } B(const A &a) : A(a) { printf("B::B(A &a)\n"); } B &operator=(const B &b)...
Hello, How do I put body of static constructor of a managed class outside class declaration? This syntax seems to be compilable, but does it really mean static constructor, or just a static (=not visible outside translation unit) function? ref class Foo { static Foo(); } static Foo::Foo() {} ...
Short question, if this works (and it does): eval("new " + generator.className + "(" + generator.constructorArgs.join(", ") + ")"); why doesn't this work: eval(generator.className + ".prototype.constructor.apply({}, generator.constructorArgs);"); The second expression always returns undefined, but in my opinion it should work. I ...
Hi, Consider the following class: class A { char *p; int a, b, c, d; public: A(const &A); }; In the above I have to define a copy constructor in order to do a deep copy of "p". This has two issues: most of the fields should simply copied. Copying them one by one is ugly and error prone. the more important problem is that whene...
I've got interface IImportManager with SessionImportManager that implements this interface. SessionImportManager's constructor must be passed an instance of HttpSessionStateBase in order to work properly. How should I register IImportManager with Unity? I've tried _unityContainer.RegisterInstance<IImportManager>(new SessionImportManag...
Hi, I have a base class(Base) whose constructor takes a reference as argument. In my derived class its constructor, I call the superclass-constructor and of course I need to pass a reference as argument. But I have to obtain that argument from a method of which the return type is by value... I will give a short example: class Base { p...
In JavaScript I can build an Array of string values like: var stuff = new Array('foo','bar','baz','boz','gaz','goz'); or even easier var stuff = 'foo,bar,baz,boz,gaz,goz'.split(','); In Java it seems overly verbose and complex... is there an easier way than this? ArrayList<String> stuff = new ArrayList<String>(); stuff.add("foo");...
Hello! How should I handle the following situation : I am writing my own 2D vector class and have the following code: class Vector2 : public (...) public: Vector2(float x, float y) { local_vector_storage_[0] = x; local_vector_storage_[1] = y; } template <typename Iterator> Vector2(Iterator begin, Iterator end) ...
scala> class A(implicit a: Int); defined class A scala> class B()(implicit a: Int); defined class B scala> new A()(1) res1: A = A@159d450 scala> new B()(1) res2: B = B@171f735 scala> new A(1) <console>:7: error: too many arguments for constructor A: ()(implicit a: Int)A new A(1) Why does Scalac insert an empty parameter list...
I have a base controller which is defined as follows, but the constructor that takes the ISiteService never gets executed: public class BaseController : Controller { private ISiteService _siteService; public BaseController() {} public BaseController(ISiteService siteService) { _siteService = siteService; // thi...
Guys for wc, a rubygem I'm writing and that is useful for counting word occurrences in a text, I choose to put 3 parameters in class constructor. The code is working, but I want to refactor it for niceness. In your experience, it's easier to read/mantain/use as API a class with a constructor with no params and a lot of setters/getters m...
I have a base class that declares and defines a constructor, but for some reason my publicly derived class is not seeing that constructor, and I therefore have to explicitly declare a forwarding constructor in the derived class: class WireCount0 { protected: int m; public: WireCount0(const int& rhs) { m = rhs; } }; class WireCo...
In Java is there anyway to have one constructor that will accept an array or a collection? I have been fiddling with this for a while but I don't think it is possible. I would like to be able to initialize MyClass, like this: MyClass c = new MyClass({"rat", "Dog", "Cat"}); And like this: LinkedList <String> l = new <String> Link...
I've seen this problem come up a lot, but never adequately handled, and I haven't seen it on Stack Overflow, so here goes. I wish there were a way to put this shortly and succinctly without lacking clarity, but I can't seem to shorten it, so bear with me... A good case-study (my current case, of course) to illustrate the problem follow...