Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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Spirit V2.1

What's changed in Spirit.Qi and Spirit.Karma from V2.0 (Boost V1.37.0) to V2.1 (Boost V1.41.0)
What's changed in Spirit.Lex from V2.0 (Boost V1.37.0) to V2.1 (Boost V1.41.0)

Here is a list of changes in Spirit.Lex since version 2.0. Spirit.Lex 2.1 is a complete rewrite of the Spirit.Lex distributed with Boost V1.37. As with all code portions of the Spirit library, Spirit.Lex is usable as stand alone piece. Spirit.Lex now uses the infrastructure provided by Spirit version 2.1.