/* Copyright 2003-2008 Joaquin M Lopez Munoz. | |
* 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 |