text: // * License and Disclaimer                                           *
  //
  // MIT License
  
  // Copyright (c) 2020 Andrew Cudd
  
  // 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.
  //
  // class EDepSim::Interpolator
  //
  // Class description:
  //
  // Class for routines for interpolating data on a regular grid.
  //
  // History:
  // - 2020.04.14 A.Cudd created
  // -------------------------------------------------------------------
  
  #ifndef EDEPSIMINTERPOLATOR_HH
  #define EDEPSIMINTERPOLATOR_HH
  
  #include <cmath>
  #include <iostream>
  #include <vector>
  
  namespace EDepSim {class Cubic;}
  
  class EDepSim::Cubic
  {
      public:
          Cubic();
  
          double interpolate(
              const double* point,
              const std::vector<std::vector<std::vector<double>>>& g,
              const double* delta, const double* offset) const;
          double interpolate(
              double x, double y, double z,
              const std::vector<std::vector<std::vector<double>>>& g,
              double hx, double hy, double hz, double xo, double yo, double zo)
              const;
  
      private:
          double conv_kernel(double s) const;
  };
  
  #endif
  