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/* 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