[857] | 1 | /* Copyright 2003-2005 Joaquín M López Muñoz.
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| 2 | * Distributed under the Boost Software License, Version 1.0.
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| 3 | * (See accompanying file LICENSE_1_0.txt or copy at
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| 4 | * http://www.boost.org/LICENSE_1_0.txt)
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| 5 | *
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| 6 | * See http://www.boost.org/libs/multi_index for library home page.
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| 7 | */
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| 8 |
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| 9 | #ifndef BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP
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| 10 | #define BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP
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| 11 |
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| 12 | #if defined(_MSC_VER)&&(_MSC_VER>=1200)
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| 13 | #pragma once
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| 14 | #endif
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| 15 |
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| 16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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| 17 | #include <boost/detail/workaround.hpp>
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| 18 |
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| 19 | #if BOOST_WORKAROUND(BOOST_MSVC,<1300)
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| 20 | #include <boost/mpl/if.hpp>
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| 21 | #include <boost/mpl/integral_c.hpp>
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| 22 | #include <boost/mpl/aux_/msvc_never_true.hpp>
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| 23 | #endif
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| 24 |
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| 25 | namespace boost{
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| 26 |
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| 27 | namespace multi_index{
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| 28 |
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| 29 | namespace detail{
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| 30 |
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| 31 | #if BOOST_WORKAROUND(BOOST_MSVC,<1300)
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| 32 | /* See
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| 33 | * http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Effective_MPL
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| 34 | * Item 5.6, Beware of the 'early template instantiation' trap.
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| 35 | */
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| 36 |
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| 37 | template<typename Type,typename Construct>
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| 38 | struct prevent_eti
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| 39 | {
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| 40 | typedef typename mpl::if_<
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| 41 | mpl::aux::msvc_never_true<Type>,
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| 42 | mpl::integral_c<int,0>,
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| 43 | Construct
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| 44 | >::type type;
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| 45 | };
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| 46 | #else
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| 47 | template<typename Type,typename Construct>
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| 48 | struct prevent_eti
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| 49 | {
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| 50 | typedef Construct type;
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| 51 | };
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| 52 | #endif
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| 53 |
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| 54 | } /* namespace multi_index::detail */
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| 55 |
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| 56 | } /* namespace multi_index */
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| 57 |
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| 58 | } /* namespace boost */
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| 59 |
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| 60 | #endif
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