The new keyword in JavaScript can be quite confusing when it is first encountered, as people tend to think that JavaScript is not an object-oriented programming language. What is it? What problems ...
If the new() generic constraint is applied, as in this example, that allows the class or method (the AuthenticationBase<T> class in this case) to call new T(); to construct a new instance of the specified type. There is no other way, short of reflection (this includes using System.Activator, to construct a new object of a generic type.
In the specific case of throw, throw new() is a shorthand for throw new Exception(). The feature was introduced in c# 9 and you can find the documentation as Target-typed new expressions. As you can see, there are quite a few places where it can be used (whenever the type to be created can be inferred) to make code shorter. The place where I like it the most is for fields/properties:
Note that if you declared it var a = new { }; and var o = new object();, then there is one difference, former is assignable only to another similar anonymous object, while latter being object, it can be assigned to anything.
According to this reference for operator new: Global dynamic storage operator functions are special in the standard library: All three versions of operator new are declared in the global namespac...
83 new() describes a constructor signature in typescript. What that means is that it describes the shape of the constructor. For instance take {new(): T; }. You are right it is a type. It is the type of a class whose constructor takes in no arguments. Consider the following examples
You should use new when you wish an object to remain in existence until you delete it. If you do not use new then the object will be destroyed when it goes out of scope.
The new operator uses the internal [[Construct]] method, and it basically does the following: Initializes a new native object Sets the internal [[Prototype]] of this object, pointing to the Function prototype property. If the function's prototype property is not an object (a primitive values, such as a Number, String, Boolean, Undefined or Null), Object.prototype is used instead. After ...
So the new here is really just to call TYPE 's constructor, if any. And what does TYPE mean? (i.e ::new (&x) int) what does the int do? @David- Here, TYPE is a template parameter indicating what type of objects are being stored. The line ::new (&x) int means "construct an object of type int at the memory location referred to by the pointer &x.
