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 2014. The current version is 1.89.0.
boost::hash<T*>
// In header: <boost/functional/hash.hpp> template<typename T> struct hash<T*> { std::size_t operator()(T*) const; };