ceres-solver/examples/autodiff_codegen.cc

// Ceres Solver - A fast non-linear least squares minimizer
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// http://code.google.com/p/ceres-solver/
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// Author: darius.rueckert@fau.de (Darius Rueckert)
//
// A simple example showing how to generate code for a cost functor
//
// We recommend to use the CMake integration instead of using
// GenerateCodeForFunctor directly.
//
#include "ceres/codegen/autodiff.h"

struct SquareFunctor {
  template <typename T>
  bool operator()(const T* x, T* residual) const {
    residual[0] = x[0] * x[0];
    isfinite(x[0]);
    return true;
  }
};

int main(int argc, char** argv) {
  std::vector<std::string> code =
      ceres::GenerateCodeForFunctor<SquareFunctor, 1, 1>(
          ceres::AutoDiffCodeGenOptions());
  for (auto str : code) {
    std::cout << str << std::endl;
  }
  return 0;
}