text: // Boost.Units - A C++ library for zero-overhead dimensional analysis and 
  // unit/quantity manipulation and conversion
  //
  // Copyright (C) 2003-2008 Matthias Christian Schabel
  // Copyright (C) 2008 Steven Watanabe
  //
  // Distributed under the Boost Software License, Version 1.0. (See
  // accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt)
  
  #ifndef BOOST_UNITS_IS_QUANTITY_OF_SYSTEM_HPP
  #define BOOST_UNITS_IS_QUANTITY_OF_SYSTEM_HPP
  
  ///
  /// \file
  /// \brief Check that a type is a quantity in a specified system.
  ///
  
  #include <boost/mpl/bool.hpp>
  #include <boost/units/units_fwd.hpp>
  #include <boost/units/is_unit_of_system.hpp>
  
  namespace boost {
  
  namespace units {
  
  /// Check that a type is a quantity in a specified system. 
  template<class T,class System>
  struct is_quantity_of_system :
      public mpl::false_
  { };
  
  template<class Unit,class Y,class System>
  struct is_quantity_of_system< quantity< Unit,Y>,System > :
      public is_unit_of_system<Unit, System>
  { };
  
  } // namespace units
  
  } // namespace boost
  
  #endif // BOOST_UNITS_IS_QUANTITY_OF_SYSTEM_HPP
  