/* 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