text: ////////////////////////////////////////////////////////////
  //
  // SFML - Simple and Fast Multimedia Library
  // Copyright (C) 2007-2016 Laurent Gomila (laurent@sfml-dev.org)
  //
  // This software is provided 'as-is', without any express or implied warranty.
  // In no event will the authors be held liable for any damages arising from the use of this software.
  //
  // Permission is granted to anyone to use this software for any purpose,
  // including commercial applications, and to alter it and redistribute it freely,
  // subject to the following restrictions:
  //
  // 1. The origin of this software must not be misrepresented;
  //    you must not claim that you wrote the original software.
  //    If you use this software in a product, an acknowledgment
  //    in the product documentation would be appreciated but is not required.
  //
  // 2. Altered source versions must be plainly marked as such,
  //    and must not be misrepresented as being the original software.
  //
  // 3. This notice may not be removed or altered from any source distribution.
  //
  ////////////////////////////////////////////////////////////
  
  #ifndef SFML_TOUCH_HPP
  #define SFML_TOUCH_HPP
  
  ////////////////////////////////////////////////////////////
  // Headers
  ////////////////////////////////////////////////////////////
  #include <SFML/Window/Export.hpp>
  #include <SFML/System/Vector2.hpp>
  
  
  namespace sf
  {
  class Window;
  
  ////////////////////////////////////////////////////////////
  /// \brief Give access to the real-time state of the touches
  ///
  ////////////////////////////////////////////////////////////
  class SFML_WINDOW_API Touch
  {
  public:
  
      ////////////////////////////////////////////////////////////
      /// \brief Check if a touch event is currently down
      ///
      /// \param finger Finger index
      ///
      /// \return True if \a finger is currently touching the screen, false otherwise
      ///
      ////////////////////////////////////////////////////////////
      static bool isDown(unsigned int finger);
  
      ////////////////////////////////////////////////////////////
      /// \brief Get the current position of a touch in desktop coordinates
      ///
      /// This function returns the current touch position
      /// in global (desktop) coordinates.
      ///
      /// \param finger Finger index
      ///
      /// \return Current position of \a finger, or undefined if it's not down
      ///
      ////////////////////////////////////////////////////////////
      static Vector2i getPosition(unsigned int finger);
  
      ////////////////////////////////////////////////////////////
      /// \brief Get the current position of a touch in window coordinates
      ///
      /// This function returns the current touch position
      /// relative to the given window.
      ///
      /// \param finger Finger index
      /// \param relativeTo Reference window
      ///
      /// \return Current position of \a finger, or undefined if it's not down
      ///
      ////////////////////////////////////////////////////////////
      static Vector2i getPosition(unsigned int finger, const Window& relativeTo);
  };
  
  } // namespace sf
  
  
  #endif // SFML_TOUCH_HPP
  
  
  ////////////////////////////////////////////////////////////
  /// \class sf::Touch
  /// \ingroup window
  ///
  /// sf::Touch provides an interface to the state of the
  /// touches. It only contains static functions, so it's not
  /// meant to be instantiated.
  ///
  /// This class allows users to query the touches state at any
  /// time and directly, without having to deal with a window and
  /// its events. Compared to the TouchBegan, TouchMoved
  /// and TouchEnded events, sf::Touch can retrieve the
  /// state of the touches at any time (you don't need to store and
  /// update a boolean on your side in order to know if a touch is down),
  /// and you always get the real state of the touches, even if they
  /// happen when your window is out of focus and no event is triggered.
  ///
  /// The getPosition function can be used to retrieve the current
  /// position of a touch. There are two versions: one that operates
  /// in global coordinates (relative to the desktop) and one that
  /// operates in window coordinates (relative to a specific window).
  ///
  /// Touches are identified by an index (the "finger"), so that in
  /// multi-touch events, individual touches can be tracked correctly.
  /// As long as a finger touches the screen, it will keep the same index
  /// even if other fingers start or stop touching the screen in the
  /// meantime. As a consequence, active touch indices may not always be
  /// sequential (i.e. touch number 0 may be released while touch number 1
  /// is still down).
  ///
  /// Usage example:
  /// \code
  /// if (sf::Touch::isDown(0))
  /// {
  ///     // touch 0 is down
  /// }
  ///
  /// // get global position of touch 1
  /// sf::Vector2i globalPos = sf::Touch::getPosition(1);
  ///
  /// // get position of touch 1 relative to a window
  /// sf::Vector2i relativePos = sf::Touch::getPosition(1, window);
  /// \endcode
  ///
  /// \see sf::Joystick, sf::Keyboard, sf::Mouse
  ///
  ////////////////////////////////////////////////////////////
  