// 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 access 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)
|
#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
|