text: #ifndef GREG_YEAR_HPP___
  #define GREG_YEAR_HPP___
  
  /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
   * Use, modification and distribution is subject to the
   * Boost Software License, Version 1.0. (See accompanying
   * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
   * Author: Jeff Garland
   * $Date$
   */
  
  #include <boost/date_time/compiler_config.hpp>
  #include <boost/date_time/constrained_value.hpp>
  #include <stdexcept>
  #include <string>
  
  namespace boost {
  namespace gregorian {
  
    //! Exception type for gregorian year
    struct BOOST_SYMBOL_VISIBLE bad_year : public std::out_of_range
    {
      bad_year() :
        std::out_of_range(std::string("Year is out of valid range: 1400..9999"))
      {}
    };
    //! Policy class that declares error handling gregorian year type
    typedef CV::simple_exception_policy<unsigned short, 1400, 9999, bad_year> greg_year_policies;
  
    //! Generated representation for gregorian year
    typedef CV::constrained_value<greg_year_policies> greg_year_rep;
  
    //! Represent a year (range 1400 - 9999)
    /*! This small class allows for simple conversion an integer value into
        a year for the gregorian calendar.  This currently only allows a
        range of 1400 to 9999.  Both ends of the range are a bit arbitrary
        at the moment, but they are the limits of current testing of the
        library.  As such they may be increased in the future.
    */
    class BOOST_SYMBOL_VISIBLE greg_year : public greg_year_rep {
    public:
      greg_year(value_type year) : greg_year_rep(year) {}
      operator value_type()  const {return value_;}
    };
  
  
  
  } } //namespace gregorian
  
  
  
  #endif
  