opencv_lambda_body.h

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/*
 * OpenVINS: An Open Platform for Visual-Inertial Research
 * Copyright (C) 2018-2023 Patrick Geneva
 * Copyright (C) 2018-2023 Guoquan Huang
 * Copyright (C) 2018-2023 OpenVINS Contributors
 * Copyright (C) 2018-2019 Kevin Eckenhoff
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef OV_CORE_OPENCV_LAMBDA_BODY_H
#define OV_CORE_OPENCV_LAMBDA_BODY_H
 
#include <functional>
#include <opencv2/opencv.hpp>
 
namespace ov_core {
 
/*
 * @brief Helper class to do OpenCV parallelization
 *
 * This is a utility class required to build with older version of opencv
 * On newer versions this doesn't seem to be needed, but here we just use it to ensure we can work for more opencv version.
 * https://answers.opencv.org/question/65800/how-to-use-lambda-as-a-parameter-to-parallel_for_/?answer=130691#post-id-130691
 */
class LambdaBody : public cv::ParallelLoopBody {
public:
  explicit LambdaBody(const std::function<void(const cv::Range &)> &body) { _body = body; }
  void operator()(const cv::Range &range) const override { _body(range); }
 
private:
  std::function<void(const cv::Range &)> _body;
};
 
} /* namespace ov_core */
 
#endif /* OV_CORE_OPENCV_LAMBDA_BODY_H */