text: // Boost.Bimap
  //
  // Copyright (c) 2006-2007 Matias Capeletto
  //
  // 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)
  
  /// \file tags/support/value_type_of.hpp
  /// \brief Consistent way to access the value type of a tagged or untagged type.
  
  #ifndef BOOST_BIMAP_TAGS_SUPPORT_VALUE_TYPE_OF_HPP
  #define BOOST_BIMAP_TAGS_SUPPORT_VALUE_TYPE_OF_HPP
  
  #if defined(_MSC_VER)
  #pragma once
  #endif
  
  #include <boost/config.hpp>
  
  #include <boost/bimap/tags/tagged.hpp>
  
  /** \struct boost::bimaps::tags::support::value_type_of
  \brief Metafunction to work with tagged and untagged type uniformly
  
  \code
  template< class Type >
  struct value_type_of
  {
      typedef {UntaggedType} type;
  };
  \endcode
  
  If the type is tagged this metafunction returns Type::value_type, and if it is not
  tagged it return the same type. This allows to work consistenly with tagged and
  untagged types.
  
  See also tagged, tag_of.
                                                                                  **/
  
  #ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
  
  
  namespace boost {
  namespace bimaps {
  namespace tags {
  namespace support {
  
  
  // value_type_of metafunction
  
  template< class Type >
  struct value_type_of
  {
      typedef Type type;
  };
  
  template< class Type, class Tag >
  struct value_type_of< tagged< Type, Tag > >
  {
      typedef Type type;
  };
  
  
  } // namespace support
  } // namespace tags
  } // namespace bimaps
  } // namespace boost
  
  #endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
  
  #endif // BOOST_BIMAP_TAGS_SUPPORT_VALUE_TYPE_OF_HPP
  
  
  