...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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>