text: //===--- red_head_duck.hpp - ------------------------------------*- C++ -*-===//
  //
  //                     Head First Design Patterns
  //
  //
  //===----------------------------------------------------------------------===//
  ///
  /// \file
  /// \brief
  ///
  //===----------------------------------------------------------------------===//
  
  
  #ifndef	_HFDP_CPP_STRATEGY_REDHEAD_DUCK_HPP_
  #define _HFDP_CPP_STRATEGY_REDHEAD_DUCK_HPP_
  
  //https://google.github.io/styleguide/cppguide.html#Names_and_Order_of_Includes
  //dir2 / foo2.h.
  //C system files.
  //C++ system files.
  //Other libraries' .h files.
  //Your project's .h files.
  #include "duck.hpp"
  
  namespace headfirst {
  
    class RedHead : public Duck {
  
    public:
      RedHead();
      void Display() const;
    };
  
  
  } //namespace headfirst
  #endif
  