Classification models assistance heredity, a process in which an effective derived group can be offer and you will specialise a beneficial base group

A course is a data design that will incorporate study players (constants and industries), setting people (measures, attributes, occurrences, indexers, providers, such constructors, finalizers, and you may static constructors), and nested models.

fourteen.dos.step 1 General

A category_report contains an optional band of properties (§21), followed by a recommended gang of classification_modifiers (§14.dos.2), with a recommended partial modifier (§14.2.7), with the newest keyword classification and a keen identifier you to brands the brand new classification, with a recommended variety of_parameter_list (§14.2.3), with an optional classification_legs requirements (§14.dos.4), accompanied by an elective group of method of_parameter_constraints_clauses (§fourteen.dos.5), followed closely by a category_human body (§14.2.6), optionally followed closely by a good semicolon.

A category eter_checklist try a general classification declaration. As well, any category nested inside an universal category declaration or a common struct declaration is actually itself a general category declaration, as the variety of objections toward which has variety of are provided to perform a created form of.

14.2.dos.step one General

New modifier try enabled toward nested kinds. They specifies the class hides a genetic associate of the same term, since revealed during the §14.3.5. It’s an amass-go out mistake with the the fresh modifier to appear into the a class report that is not a good nested class declaration.

Anyone , protected , inner , and personal modifiers handle the fresh new entry to of your own class. Depending on the framework where class statement takes place, some of these modifiers might not be allowed (§eight.5.2).

When a limited type statement (§14.dos.7) has an accessibility requirements (via the societal , secure , internal , and private modifiers), one to specs should agree with any parts that are included with an enthusiastic entry to requirements. In the event the no part of a partial style of comes with an accessibility specs, the sort is offered appropriate standard usage of (§7.5.2).

14.dos.dos.2 Conceptual classes

The brand new conceptual modifier is utilized to point that a course is actually unfinished and that it will probably be put just once the a bottom classification. An abstract group is different from a non-conceptual classification throughout the following suggests:

• An abstract classification can’t be instantiated really, and is also a secure-go out error to make use of the brand new user towards a conceptual classification. While it is you can easily getting details and you will values whoever assemble-big date models are conceptual, including details and you can beliefs commonly necessarily either be null otherwise have recommendations in order to loveandseek cases of low-abstract kinds based on the fresh new conceptual products.
• An abstract classification try allowed (however called for) so you’re able to incorporate abstract professionals.
• An abstract classification can’t be sealed.

When a low-conceptual class comes from an abstract classification, the newest non-abstract group shall are real implementations of all the passed on abstract professionals, thereby overriding the individuals conceptual people.

brand new conceptual class A great introduces a conceptual means F . Class B brings up an additional strategy Grams , but because does not give an utilization of F , B will additionally be proclaimed conceptual. Class C overrides F and offers a real execution. Since there are no conceptual players inside the C , C are let (yet not necessary) is non-conceptual. end analogy

If a person or even more elements of a limited style of declaration (§14.2.7) of a class include the abstract modifier, the category try conceptual. If you don’t, the category try low-conceptual.

14.2.dos.step 3 Sealed kinds

Brand new closed modifier is employed to stop derivation out of a class. A compile-date error occurs in the event that a closed classification was specified given that base category of several other group.

Note: The newest shut modifier is primarily always stop unintended derivation, but it addittionally allows certain manage-time optimizations. In particular, since the a shut classification is recognized to have not people derived groups, you are able to change digital function member invocations to the sealed category hours towards the non-digital invocations. end notice