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- // 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
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