[modernize] Use if constexpr and std::clamp in TinySolver Change-Id: I4218bfea314a2438cceb7eaf49a2ec921aaa3e45
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.