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High Quality Content by WIKIPEDIA articles! Templates are a feature of the C++ programming language that allow functions and classes to operate with generic types. This allows a function or class to work on many different data types without being rewritten for each one. Templates are of great utility to programmers in C++, especially when combined with multiple inheritance and operator overloading. The C++ Standard Library provides many useful functions within a framework of connected templates. There are two kinds of templates: function templates and class templates. In the first two cases, the template argument T is automatically deduced by the compiler to be int and double, respectively. In the third case deduction fails because the type of the parameters must in general exactly match the template arguments. This function template can be instantiated with any copy-constructible type for which the expression (y x) is valid. For user-defined types, this implies that the less-than operator must be overloaded.