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 2018. The current version is 1.89.0.
boost::algorithm::is_punct — is_punct predicate
// In header: <boost/algorithm/string/classification.hpp> unspecified is_punct(const std::locale & Loc = std::locale());