Notice: This library is in maintenance mode. Pull requests with fixes and enhancements are gratefully accepted, but no new features are planned. Please consider switching to CNL, the successor to fixed_point for many new features and improvements. The fixed_point library provides a header-only C++11 API for approximating real numbers using binary fixed-point arithmetic. It forms the reference implementation of a standard library proposal presented in paper, P0037 and is developed as part of study groups, SG14 and SG6.