Abstract type: Difference between revisions

'''Abstract type''' is a type without instances. In [[object-oriented programming]] abstract types are used for partial implementation of other types, which are later derived from it. Abstract type may provide implementation of some operations and/or components. Abstract types without any implementation are called '''interfaces'''. In the languages that do not support multiple [[inheritance]] ([[Ada]], [[Java]]), interfaces are usually allowed to be multiply inherited from. The languages with multiple inheritance (like [[C++]]), usually make no distinction between partially implementable abstract types and interfaces.