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 2020. The current version is 1.89.0.
Defines the Cartesian or rectangular coordinate system where points are defined in 2 or 3 (or more) dimensions and usually (but not always) known as x,y,z
struct cs::cartesian { // ... };
Either
#include <boost/geometry.hpp>
Or
#include <boost/geometry/core/cs.hpp>