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 2023. The current version is 1.89.0.
boost::log::open_mode::open_or_create_tag — Creates a new resource or opens an existing one.
// In header: <boost/log/utility/open_mode.hpp> struct open_or_create_tag { };