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'''Template metaprogramming''' ('''TMP''') is a [[metaprogramming]] technique in which [[Generic programming|templates]] are used by a [[compiler]] to generate temporary [[source code]], which is merged by the compiler with the rest of the source code and then compiled. The output of these templates can include [[compile time|compile-time]] [[constant (programming)|constant]]s, [[data structure]]s, and complete [[function (computer science)|function]]s. The use of templates can be thought of as [[Compile-time function execution|compile-time polymorphism]]. The technique is used by a number of languages, the best-known being [[C++]], but also [[Curl programming language|Curl]], [[D programming language|D]], [[Nim (programming language)|Nim]], and [[XL Programming Language|XL]].
Template metaprogramming was, in a sense, discovered accidentally.<ref name="Meyers2005">{{cite book|author=Scott Meyers|title=Effective C++: 55 Specific Ways to Improve Your Programs and Designs|url=https://books.google.com/books?id=Qx5oyB49poYC&q=%22Template+metaprogramming%22|date=12 May 2005|publisher=Pearson Education|isbn=978-0-13-270206-5}}</ref><ref>See [[wikibooks:C++ Programming/Templates/Template Meta-Programming#History of TMP|History of TMP]] on Wikibooks</ref>alexsio nau
Some other languages support similar, if not more powerful, compile-time facilities (such as [[Lisp (programming language)|Lisp]] [[Macro (computer science)#Syntactic macros|macros]]), but those are outside the scope of this article.
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