Most languages allow overloading the constructor in that there can be more than one constructor for a class, with differing parameters. This is a different usage than in this article. Programmers also use the term constructor to denote one of the tags that wraps data in an algebraic data type. Immutable objects must be initialized in a constructor. A properly written constructor leaves the resulting object in a valid state. They have the task of initializing the object's data members and of establishing the invariant of the class, failing if the invariant is invalid. Constructors often have the same name as the declaring class. It is called a constructor because it constructs the values of data members of the class.Ī constructor resembles an instance method, but it differs from a method in that it has no explicit return type, it is not implicitly inherited and it usually has different rules for scope modifiers. It prepares the new object for use, often accepting parameters that the constructor uses to set member variables required for the object to reach a valid state. In object-oriented programming, a constructor (sometimes shortened to ctor) in a class is a special type of subroutine called to create an object.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |