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In computer science, generics are a technique that allows one value to take different datatype (so-called polymorphism) as long as certain contracts (so-called subtype) are kept. The programming style with it is called "generic programming". With properly implemented generics, it is possible to do Template metaprogramming, which is a way of making algorithms evaluate when your code is compiled.

Among OOP languages, C++, Beta, Eiffel, Ada, and later versions of Java provides generic facility. In C++, templates support generics and popularized the notion of generics.

For example, in C++ code,

template <typename T>
T max (T x, T y)
  if (x < y)
    return y;
    return x;

In this case, a pseudo-datatype T is called "subtype". T can be anything that can be compared.

See also Partial evaluation

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