// 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/tag_of.hpp | |
/// \brief Safe way to acces the tag of a type | |
#ifndef BOOST_BIMAP_TAGS_SUPPORT_TAG_OF_HPP | |
#define BOOST_BIMAP_TAGS_SUPPORT_TAG_OF_HPP | |
#if defined(_MSC_VER) && (_MSC_VER>=1200) | |
#pragma once | |
#endif | |
#include <boost/config.hpp> | |
#include <boost/bimap/tags/tagged.hpp> | |
#include <boost/bimap/detail/debug/static_error.hpp> | |
/** \struct boost::bimaps::tags::support::tag_of | |
\brief Metafunction to obtain the tag of a type. | |
\code | |
template< class TaggedType > | |
struct tag_of | |
{ | |
typedef {Tag} type; | |
}; | |
\endcode | |
If the type is not tagged you will get a compile timer error with the following message: | |
\verbatim | |
USING_TAG_OF_WITH_AN_UNTAGGED_TYPE, TaggedType | |
\endverbatim | |
See also tagged, value_type_of. | |
**/ | |
#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES | |
namespace boost { | |
namespace bimaps { | |
namespace tags { | |
namespace support { | |
// tag_of metafunction | |
template< class Type > | |
struct tag_of | |
{ | |
BOOST_BIMAP_STATIC_ERROR( USING_TAG_OF_WITH_AN_UNTAGGED_TYPE, (Type) ); | |
}; | |
template< class Type, class Tag > | |
struct tag_of< tagged< Type, Tag > > | |
{ | |
typedef Tag type; | |
}; | |
} // namespace support | |
} // namespace tags | |
} // namespace bimaps | |
} // namespace boost | |
#endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES | |
#endif // BOOST_BIMAP_TAGS_SUPPORT_TAG_OF_HPP | |