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# Tutorial: Metafunctions and Higher-Order Metaprogramming

Note: | The following material is an excerpt from Chapter 3 of "C++ Template Metaprogramming", by David Abrahams and Aleksey Gurtovoy, ISBN 0321227255, http://www.awprofessional.com/titles/0321227255. Copyright (c) 2005 by Pearson Education, Inc. Reprinted with permission.

With the foundation laid so far, we're ready to explore one of the most basic uses for template metaprogramming techniques: adding static type checking to traditionally unchecked operations. We'll look at a practical example from science and engineering that can find applications in almost any numerical code. Along the way you'll learn some important new concepts and get a taste of metaprogramming at a high level using the MPL.