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/* Copyright 2006-2008 Joaquin M Lopez Munoz.
* 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)
*
* See http://www.boost.org/libs/flyweight for library home page.
*/
#ifndef BOOST_FLYWEIGHT_TAG_HPP
#define BOOST_FLYWEIGHT_TAG_HPP
#if defined(_MSC_VER)&&(_MSC_VER>=1200)
#pragma once
#endif
#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
#include <boost/parameter/parameters.hpp>
#include <boost/type_traits/is_base_and_derived.hpp>
/* A type T can be used as a tag in the specification of a flyweight
* by passing it wrapped in the form tag<T>.
*/
namespace boost{
namespace flyweights{
namespace detail{
struct tag_marker{};
template<typename T>
struct is_tag:is_base_and_derived<tag_marker,T>
{};
} /* namespace flyweights::detail */
template<typename T=parameter::void_>
struct tag:parameter::template_keyword<tag<>,T>,detail::tag_marker
{};
} /* namespace flyweights */
} /* namespace boost */
#endif
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