Pass ExpressionRef by const reference instead of by value Currently there is a bug in the copy constructor of ExpressionRef. Fixing this bug, will create new expressions each time a copy is executed. To reduce the amount of copy expression we pass ExpressionRef by const reference now. Change-Id: I0f81fb3d08aa4c66b9191f3138650f17023af67e
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.