text: ////////////////////////////////////////////////////////////
  //
  // SFML - Simple and Fast Multimedia Library
  // Copyright (C) 2007-2015 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.
  //
  ////////////////////////////////////////////////////////////
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T>::Vector2() :
  x(0),
  y(0)
  {
  
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T>::Vector2(T X, T Y) :
  x(X),
  y(Y)
  {
  
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  template <typename U>
  inline Vector2<T>::Vector2(const Vector2<U>& vector) :
  x(static_cast<T>(vector.x)),
  y(static_cast<T>(vector.y))
  {
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T> operator -(const Vector2<T>& right)
  {
      return Vector2<T>(-right.x, -right.y);
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T>& operator +=(Vector2<T>& left, const Vector2<T>& right)
  {
      left.x += right.x;
      left.y += right.y;
  
      return left;
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T>& operator -=(Vector2<T>& left, const Vector2<T>& right)
  {
      left.x -= right.x;
      left.y -= right.y;
  
      return left;
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T> operator +(const Vector2<T>& left, const Vector2<T>& right)
  {
      return Vector2<T>(left.x + right.x, left.y + right.y);
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T> operator -(const Vector2<T>& left, const Vector2<T>& right)
  {
      return Vector2<T>(left.x - right.x, left.y - right.y);
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T> operator *(const Vector2<T>& left, T right)
  {
      return Vector2<T>(left.x * right, left.y * right);
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T> operator *(T left, const Vector2<T>& right)
  {
      return Vector2<T>(right.x * left, right.y * left);
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T>& operator *=(Vector2<T>& left, T right)
  {
      left.x *= right;
      left.y *= right;
  
      return left;
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T> operator /(const Vector2<T>& left, T right)
  {
      return Vector2<T>(left.x / right, left.y / right);
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline Vector2<T>& operator /=(Vector2<T>& left, T right)
  {
      left.x /= right;
      left.y /= right;
  
      return left;
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline bool operator ==(const Vector2<T>& left, const Vector2<T>& right)
  {
      return (left.x == right.x) && (left.y == right.y);
  }
  
  
  ////////////////////////////////////////////////////////////
  template <typename T>
  inline bool operator !=(const Vector2<T>& left, const Vector2<T>& right)
  {
      return (left.x != right.x) || (left.y != right.y);
  }
  