Replace NULL with nullptr in the documentation. Change-Id: I995f68770e2a4b6027c0a1d3edf5eb5132b081d7
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.