text: #ifndef BOOST_ARCHIVE_ITERATORS_UNESCAPE_HPP
  #define BOOST_ARCHIVE_ITERATORS_UNESCAPE_HPP
  
  // MS compatible compilers support #pragma once
  #if defined(_MSC_VER)
  # pragma once
  #endif
  
  /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
  // unescape.hpp
  
  // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
  // Use, modification and distribution is subject to 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)
  
  //  See http://www.boost.org for updates, documentation, and revision history.
  
  #include <boost/assert.hpp>
  
  #include <boost/iterator/iterator_adaptor.hpp>
  #include <boost/pointee.hpp>
  
  namespace boost { 
  namespace archive {
  namespace iterators {
  
  /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
  // class used by text archives to translate char strings to wchar_t
  // strings of the currently selected locale
  template<class Derived, class Base>
  class unescape 
      : public boost::iterator_adaptor<
          unescape<Derived, Base>,
          Base, 
          typename pointee<Base>::type,
          single_pass_traversal_tag,
          typename pointee<Base>::type
      >
  {
      friend class boost::iterator_core_access;
      typedef typename boost::iterator_adaptor<
          unescape<Derived, Base>, 
          Base, 
          typename pointee<Base>::type,
          single_pass_traversal_tag,
          typename pointee<Base>::type
      > super_t;
  
      typedef unescape<Derived, Base> this_t;
  public:
      typedef typename this_t::value_type value_type;
      typedef typename this_t::reference reference;
  private:
      value_type dereference_impl() {
          if(! m_full){
              m_current_value = static_cast<Derived *>(this)->drain();
              m_full = true;
          }
          return m_current_value;
      }
  
      reference dereference() const {
          return const_cast<this_t *>(this)->dereference_impl();
      }
  
      value_type m_current_value;
      bool m_full;
  
      void increment(){
          ++(this->base_reference());
          dereference_impl();
          m_full = false;
      };
  
  public:
  
      unescape(Base base) : 
          super_t(base),
          m_full(false)
      {}
  
  };
  
  } // namespace iterators
  } // namespace archive
  } // namespace boost
  
  #endif // BOOST_ARCHIVE_ITERATORS_UNESCAPE_HPP
  