/* Copyright 2003-2005 Joaquín M López Muñoz.

 * 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/multi_index for library home page.

 */

#ifndef BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP

#define BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_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/detail/workaround.hpp>

#if BOOST_WORKAROUND(BOOST_MSVC,<1300)

#include <boost/mpl/if.hpp>

#include <boost/mpl/integral_c.hpp>

#include <boost/mpl/aux_/msvc_never_true.hpp>

#endif

namespace boost{

namespace multi_index{

namespace detail{

#if BOOST_WORKAROUND(BOOST_MSVC,<1300)

/* See

 * http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Effective_MPL

 * Item 5.6, Beware of the 'early template instantiation' trap.

 */

template<typename Type,typename Construct>

struct prevent_eti

{

  typedef typename mpl::if_<

    mpl::aux::msvc_never_true<Type>,

    mpl::integral_c<int,0>,

    Construct

  >::type type;

};

#else

template<typename Type,typename Construct>

struct prevent_eti

{

  typedef Construct type;

};

#endif

} /* namespace multi_index::detail */

} /* namespace multi_index */

} /* namespace boost */

#endif