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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

/// \file tags/support/overwrite_tagged.hpp
/// \brief Hard tagging


#if defined(_MSC_VER) && (_MSC_VER>=1200)
#pragma once

#include <boost/config.hpp>

#include <boost/bimap/tags/tagged.hpp>

/** \struct boost::bimaps::tags::support::overwrite_tagged
\brief Hard tagging metafunction

template< class Type, class Tag >
struct overwrite_tagged
    typedef {TaggedType} type;

If the type is not tagged, this metafunction returns a tagged type with the
passed tag. If it is tagged it returns a new tagged type with the tag replaced
by the one passed as a parameter.

See also tagged, default_tagged.


namespace boost {
namespace bimaps {
namespace tags {
namespace support {

// Change the tag

template< class Type, class NewTag >
struct overwrite_tagged
    typedef tagged<Type,NewTag> type;

template< class Type, class OldTag, class NewTag >
struct overwrite_tagged< tagged< Type, OldTag >, NewTag >
    typedef tagged<Type,NewTag> type;

} // namespace support
} // namespace tags
} // namespace bimaps
} // namespace boost