61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
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/* Copyright 2003-2008 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/multi_index for library home page.
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*/
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#ifndef BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP
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#define BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP
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#if defined(_MSC_VER)&&(_MSC_VER>=1200)
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#pragma once
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#endif
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#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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#include <boost/detail/workaround.hpp>
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#if BOOST_WORKAROUND(BOOST_MSVC,<1300)
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/integral_c.hpp>
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#include <boost/mpl/aux_/msvc_never_true.hpp>
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#endif
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namespace boost{
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namespace multi_index{
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namespace detail{
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#if BOOST_WORKAROUND(BOOST_MSVC,<1300)
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/* See
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* http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Effective_MPL
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* Item 5.6, Beware of the 'early template instantiation' trap.
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*/
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template<typename Type,typename Construct>
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struct prevent_eti
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{
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typedef typename mpl::if_<
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mpl::aux::msvc_never_true<Type>,
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mpl::integral_c<int,0>,
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Construct
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>::type type;
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};
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#else
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template<typename Type,typename Construct>
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struct prevent_eti
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{
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typedef Construct type;
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};
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#endif
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} /* namespace multi_index::detail */
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} /* namespace multi_index */
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} /* namespace boost */
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#endif
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