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 2022. The current version is 1.89.0.
boost::xpressive::val — Helper for constructing value<> objects.
// In header: <boost/xpressive/regex_actions.hpp> template<typename T> value< T > const val(T const & t);