text: // ----------------------------------------------------------------------------
  // -                        Open3D: www.open3d.org                            -
  // ----------------------------------------------------------------------------
  // The MIT License (MIT)
  //
  // Copyright (c) 2018 www.open3d.org
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  // IN THE SOFTWARE.
  // ----------------------------------------------------------------------------
  
  #pragma once
  
  #include <Eigen/Core>
  #include <Core/Utility/Eigen.h>
  
  namespace Json {
  class Value;
  }  // namespace Json
  
  namespace open3d {
  
  /// Class IJsonConvertible defines the behavior of a class that can convert
  /// itself to/from a json::Value.
  class IJsonConvertible {
  public:
      virtual ~IJsonConvertible() {}
  
  public:
      virtual bool ConvertToJsonValue(Json::Value &value) const = 0;
      virtual bool ConvertFromJsonValue(const Json::Value &value) = 0;
  
  public:
      static bool EigenVector3dFromJsonArray(Eigen::Vector3d &vec,
                                             const Json::Value &value);
      static bool EigenVector3dToJsonArray(const Eigen::Vector3d &vec,
                                           Json::Value &value);
      static bool EigenVector4dFromJsonArray(Eigen::Vector4d &vec,
                                             const Json::Value &value);
      static bool EigenVector4dToJsonArray(const Eigen::Vector4d &vec,
                                           Json::Value &value);
      static bool EigenMatrix3dFromJsonArray(Eigen::Matrix3d &mat,
                                             const Json::Value &value);
      static bool EigenMatrix3dToJsonArray(const Eigen::Matrix3d &mat,
                                           Json::Value &value);
      static bool EigenMatrix4dFromJsonArray(Eigen::Matrix4d &mat,
                                             const Json::Value &value);
      static bool EigenMatrix4dToJsonArray(const Eigen::Matrix4d &mat,
                                           Json::Value &value);
      static bool EigenMatrix4dFromJsonArray(Eigen::Matrix4d_u &mat,
                                             const Json::Value &value);
      static bool EigenMatrix4dToJsonArray(const Eigen::Matrix4d_u &mat,
                                           Json::Value &value);
      static bool EigenMatrix6dFromJsonArray(Eigen::Matrix6d &mat,
                                             const Json::Value &value);
      static bool EigenMatrix6dToJsonArray(const Eigen::Matrix6d &mat,
                                           Json::Value &value);
      static bool EigenMatrix6dFromJsonArray(Eigen::Matrix6d_u &mat,
                                             const Json::Value &value);
      static bool EigenMatrix6dToJsonArray(const Eigen::Matrix6d_u &mat,
                                           Json::Value &value);
  };
  
  }  // namespace open3d
  