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

QVM: Quaternions, Vectors, Matrices

BOOST_QVM_INLINE_RECURSION

#include <boost/qvm/inline.hpp>

#ifndef BOOST_QVM_INLINE_RECURSION
#define BOOST_QVM_INLINE_RECURSION BOOST_QVM_INLINE_OPERATIONS
#endif

Boost QVM uses BOOST_QVM_INLINE_RECURSION in definitions of recursive functions that are not critical for the overall performance of the library (definitions of all critical functions, including critical recursive functions, use BOOST_QVM_INLINE_CRITICAL.)