Keywords: ISO C++, library

Chapter 6. Utilities
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## Chapter 6. Utilities

## Functors

If you don't know what functors are, you're not alone. Many people get slightly the wrong idea. In the interest of not reinventing the wheel, we will refer you to the introduction to the functor concept written by SGI as part of their STL, in their https://web.archive.org/web/20171225062613/http://www.sgi.com/tech/stl/functors.html.

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