Replace NULL by nullptr Change-Id: I200a40678091b984a01635d8637a487b7ad5cc13
Ceres Solver is an open source C++ library for modeling and solving large, complicated optimization problems. It is a feature rich, mature and performant library which has been used in production at Google since 2010. Ceres Solver can solve two kinds of problems.
Please see ceres-solver.org for more information.