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Existentially quantified procedures:L a mechanism for abstracting type in dynmaic typing constructs

机译:存在量化的过程:L一种在动态类型构造中抽象类型的机制

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Existential quantification of procedures is introduced as a mechanism for languages with dynmaic typing.It allws abstraction over types whose represesentations requrei to be manipulated at run time.universal quantification.the mechanism normally associated with porocedrual type abstraction,is shown to be unsuitable for htis style of abstraction.For many such procedures only a single tupe specifalisation is correct,hence the analogy with existential quantification from predicate logic.For any invocation of an existentially quantified procedure,the run-time system will requrei to maintain a single type representation for which the abstracted type stands.Existential quantificatin represents a class of ad hoc polymorphism,where operatios over values of the abstracted type may behave differently according to the actual specialisation.
机译:程序的存在性量化被引入作为具有动态类型的语言的一种机制。它对在运行时需要表达其表示形式的类型进行抽象化。对于许多这样的过程,只有一个元组规范化是正确的,因此可以与谓词逻辑中的存在性量化进行类比。对于任何存在性量化过程的调用,运行时系统将要求维护一个单一类型表示,存在量化表示一类即席多态性,其中对抽象类型的值进行的运算可能会根据实际专业而有所不同。

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