// COLMAP - Structure-from-Motion and Multi-View Stereo.
// Copyright (C) 2017  Johannes L. Schoenberger <jsch at inf.ethz.ch>
//
// 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 <http://www.gnu.org/licenses/>.

#ifndef COLMAP_SRC_OPTIM_RANDOM_SAMPLER_H_
#define COLMAP_SRC_OPTIM_RANDOM_SAMPLER_H_

#include "optim/sampler.h"

namespace colmap {

// Random sampler for RANSAC-based methods.
//
// Note that a separate sampler should be instantiated per thread.
class RandomSampler : public Sampler {
 public:
  explicit RandomSampler(const size_t num_samples);

  void Initialize(const size_t total_num_samples) override;

  size_t MaxNumSamples() override;

  std::vector<size_t> Sample() override;

 private:
  const size_t num_samples_;
  std::vector<size_t> sample_idxs_;
};

}  // namespace colmap

#endif  // COLMAP_SRC_OPTIM_RANDOM_SAMPLER_H_
