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 2013. The current version is 1.91.0.
boost::intrusive::splay_set_defaults
// In header: <boost/intrusive/splaytree.hpp> template<typename T> struct splay_set_defaults { };