Abstract type

In programming languages, an abstract type is a type in a nominative type system that cannot be instantiated directly. Abstract types are also known as existential types. An abstract type may provide no implementation, or an incomplete implementation. Often, abstract types will have one or more implementations provided separately, for example, in the form of concrete subclasses that can be instantiated. It may include abstract methods or abstract properties that are shared by its subtypes.

单词	Abstract type
释义	Abstract type 原声例句盖茨夫妇访谈录 Math is a very abstract type of reasoning. 数学是一种非常抽象的推理类型。英语百科 Abstract type In programming languages, an abstract type is a type in a nominative type system that cannot be instantiated directly. Abstract types are also known as existential types. An abstract type may provide no implementation, or an incomplete implementation. Often, abstract types will have one or more implementations provided separately, for example, in the form of concrete subclasses that can be instantiated. It may include abstract methods or abstract properties that are shared by its subtypes.
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