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60 lines
1.3 KiB
60 lines
1.3 KiB
/* 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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