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I have a project which possesses and uses G2O library, it runs on both platforms(win/Unix).


We can see in both platforms, these lines:

g2o::SparseOptimizer optimizer;
g2o::BlockSolver_6_3::LinearSolverType * linearSolver;

linearSolver = new g2o::LinearSolverDense<g2o::BlockSolver_6_3::PoseMatrixType>();

Next steps, in window os we have this:

g2o::BlockSolver_6_3 * solver_ptr = new g2o::BlockSolver_6_3(linearSolver);
g2o::OptimizationAlgorithmLevenberg* solver = new g2o::OptimizationAlgorithmLevenberg(solver_ptr);

But Unix system can't compile those lines because it says

my_file_G2o.cpp: In member function 'int Refiner_G2O::refinePose(cv::Mat&, const std::vector<cv::Point3_ >&, const std::vector<cv::KeyPoint>&, const cv::Mat&, float, std::vector&)': my_file_G2o.cpp --> no matching function for call to 'g2o::BlockSolver<g2o::BlockSolverTraits<6, 3>::BlockSolver(g2o::BlockSolver<g2o::BlockSolverTraits<6, 3>::LinearSolverType&)' ^ In file included from G2o/include/g2o/core/block_solver.h:199:0, G2o/include/g2o/core/block_solver.hpp:40:1: note: candidate: g2o::BlockSolver::BlockSolver(std::unique_ptr) [with Traits = g2o::BlockSolverTraits<6, 3>; typename Traits::LinearSolverType = g2o::LinearSolver<Eigen::Matrix<double, 6, 6, 0> >] BlockSolver::BlockSolver(std::unique_ptr linearSolver)

When I see these errors, I complete my Unix code with this new block

auto solver_ptr = g2o::make_unique<g2o::BlockSolver_6_3>(linearSolver); // [SEGFAULT LINE]
auto solver = g2o::make_unique<g2o::OptimizationAlgorithmLevenberg>(solver_ptr);

So now, I can build/run but I meet a segfault on the line with [SEGFAULT LINE] tag.

I don't understand, why? if someone has an idea I want to understand how in Window it works and not in Unix system, will feel wonderful if you help.

LINUX Version: Ubuntu 16.04
CMAKE Version: 3.11.4

Best regards,

Originally posted by Simontraww on ROS Answers with karma: 16 on 2018-08-02

Post score: 0


1 Answer 1


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G2O optimise:

g2o::SparseOptimizer optimizer;

auto linearSolver = std::make_unique<g2o::LinearSolverDense<g2o::BlockSolver_6_3::PoseMatrixType>>();

auto solver = new g2o::OptimizationAlgorithmLevenberg(std::make_unique<g2o::BlockSolver_6_3>(std::move(linearSolver)));



template<typename T, typename ...ArgTs>
std::unique_ptr<T> make_unique(ArgTs&& ...args)
  return std::unique_ptr<T>(new T(std::forward<ArgTs>(args)...));

Originally posted by Simontraww with karma: 16 on 2018-08-03

This answer was ACCEPTED on the original site

Post score: 0

Original comments

Comment by Vignesh_93 on 2020-12-12:
Can you explain the MISC.H, do we need to create this file separately or we can add this to the existing file itself ?


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