Boost.Parser is a recently-submitted Boost candidate library for C++17 and later. It is a parsing library in the mold of Boost.Spirit, updated with idioms and capabilities that can only be done in later versions of C++. Boost.Parser takes the best of Spirit 2 and Spirit X3, and adds features and simplifications that neither has.
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Zach Laine is a Boost author and C++ Standard Committee member. He has been writing C++ professionally for over 20 years, focusing on graphics, scientific computing, games, metaprogramming, generic programming, and good library design.