Parametric Polymorphism - History

History

Parametric polymorphism was first introduced to programming languages in ML in 1976. Today it exists in Standard ML, OCaml, F#, Ada, Haskell, Visual Prolog, Scala, and others. Java, C#, Visual Basic .NET and Delphi have each recently introduced "generics" for parametric polymorphism. Some implementations of type polymorphism are superficially similar to parametric polymorphism while also introducing ad-hoc aspects. One example is C++ template specialization.

The most general form of polymorphism is "higher-rank impredicative polymorphism". Two popular restrictions of this form are restricted rank polymorphism (for example, rank-1 or prenex polymorphism) and predicative polymorphism. Together, these restrictions give "predicative prenex polymorphism", which is essentially the form of polymorphism found in ML and early versions of Haskell.

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