Abstract

C++0x is the working title for the revision of the ISO standard of the C++ programming language that was originally planned for release in 2009 (but that will probably appear in 2011). The largest language extension in C++0x was “concepts”, that is, a collection of features for constraining template parameters. In September of 2008, the C++ standards committee voted the concepts extension into C++0x, but then in July of 2009, the committee voted the concepts extension back out of C++0x. This article is my account of the technical challenges and debates within the “concepts” effort in the years 2003 to 2009.

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