// Boost.Bimap
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//
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// Copyright (c) 2006-2007 Matias Capeletto
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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/// \file tags/support/default_tagged.hpp
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/// \brief Weak tagging
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#ifndef BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
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#define BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp>
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#include <boost/bimap/tags/tagged.hpp>
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/** \struct boost::bimaps::tags::support::default_tagged
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\brief Weak tagging metafunction
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\code
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template< class Type, class Tag >
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struct default_tagged
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{
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typedef {TaggedType} type;
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};
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\endcode
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If the type is not tagged, this metafunction returns a tagged type with the
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default tag. If it is tagged, the returns the type unchanged.
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See also tagged, overwrite_tagged.
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**/
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#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
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namespace boost {
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namespace bimaps {
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namespace tags {
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namespace support {
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// Default Tagging
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// A metafunction that create a tagged type with a default tag value.
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template< class Type, class DefaultTag >
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struct default_tagged
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{
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typedef tagged<Type,DefaultTag> type;
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};
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template< class Type, class OldTag, class NewTag >
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struct default_tagged< tagged< Type, OldTag >, NewTag >
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{
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typedef tagged<Type,OldTag> type;
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};
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} // namespace support
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} // namespace tags
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} // namespace bimaps
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} // namespace boost
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#endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
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#endif // BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
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