Well sure! Let’s assume that you have in interface IMyCollection. It has a method boolean isMutable(). Now you have two classes, class MyMutableList and class MyImmutableList, which both implement IMyCollection. Each of them would override the instance method isMutable(), with MyMutableList simply returning true and MyImmutableList returning false. isMutable() in both classes is an instance … Read more
The simplest fix is to make the comparator function be static: static int comparator (const Bar & first, const Bar & second); ^^^^^^ When invoking it in Count, its name will be Foo::comparator. The way you have it now, it does not make sense to be a non-static member function because it does not use … Read more
The only difference is that static methods in a nonstatic class cannot be extension methods. In other words, this is invalid: class Test { static void getCount(this ICollection<int> collection) { return collection.Count; } } whereas this is valid: static class Test { static void getCount(this ICollection<int> collection) { return collection.Count; } }
No, it is directly prohibited by the standard: ISO 14882:2003 C++ Standard 13.1/2 – Overloadable declarations Certain function declarations cannot be overloaded: Function declarations that differ only in the return type cannot be overloaded. Member function declarations with the same name and the same parameter types cannot be overloaded if any of them is a … Read more
The Main method is Static. You can not invoke a non-static method from a static method. GetRandomBits() is not a static method. Either you have to create an instance of Program Program p = new Program(); p.GetRandomBits(); or make GetRandomBits() static.
That means it should be called like: $timer = (new VTimer)->get($options[‘magic’]); The difference between static and non-static is that the first one doesn’t need instantiation so you can call the classname then append :: to it and call the method immediately. Like so: ClassName::method(); and if the method is not static you need to initialize … Read more
The basic paradigm in Java is that you write classes, and that those classes are instantiated. Instantiated objects (an instance of a class) have attributes associated with them (member variables) that affect their behavior; when the instance has its method executed it will refer to these variables. However, all objects of a particular type might … Read more
The only way to call a non-static method from a static method is to have an instance of the class containing the non-static method. By definition, a non-static method is one that is called ON an instance of some class, whereas a static method belongs to the class itself.
You must understand the difference between a class and an instance of that class. If you see a car on the street, you know immediately that it’s a car even if you can’t see which model or type. This is because you compare what you see with the class “car”. The class contains which is … Read more