Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2019. The current version is 1.89.0.
// forwards to <boost/spirit/home/qi/nonterminal.hpp> #include <boost/spirit/include/qi_nonterminal.hpp>
Also, see Include Structure.