text: 
  /*****************************************************************************
  *                                                                            *
  *  Copyright 2016 Paul Cottalorda                                            *
  *                                                                            *
  *  Licensed under the Apache License, Version 2.0 (the "License");           *
  *  you may not use this file except in compliance with the License.          *
  *  You may obtain a copy of the License at                                   *
  *                                                                            *
  *      http://www.apache.org/licenses/LICENSE-2.0                            *
  *                                                                            *
  *  Unless required by applicable law or agreed to in writing, software       *
  *  distributed under the License is distributed on an "AS IS" BASIS,         *
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  *
  *  See the License for the specific language governing permissions and       *
  *  limitations under the License.                                            *
  *                                                                            *
  ******************************************************************************/
  
  class Rational2DPoint;
  using Rational2DForm = Rational2DPoint;
  
  Rational2DPoint computeIntersection(const Rational2DForm& p1, const Rational2DForm& p2);
  