does c++ STL define Pi? -

does c++ STL define Pi? -

does stl contain definition pi (=3.14)? certainly, can utilize old m_pi, non-standard , not cross-compiler compliant.

boost.math defines pi (and many other) mathematical constants high precision

#include <boost/math/constants.hpp> long double pi = boost::math::constants::pi<long double>();

a total list available here.

stl pi