install on ubuntu20

sudo apt install libceres-dev

查看ceres版本

sudo cat /usr/local/include/ceres/version.h

Problem problem;

// Add residual terms to the problem using the autodiff wrapper to get the derivatives automatically.
problem.AddResidualBlock(new AutoDiffCostFunction<F1, 1, 1, 1>(new F1), nullptr, &x1, &x2);
// AutoDiffCostFunction<函数，残差的数量，第一个参数块，第二个参数块>