epoc32/include/stdapis/boost/multi_index/detail/prevent_eti.hpp
author William Roberts <williamr@symbian.org>
Wed, 31 Mar 2010 12:27:01 +0100
branchSymbian2
changeset 3 e1b950c65cb4
permissions -rw-r--r--
Attempt to represent the S^2->S^3 header reorganisation as a series of "hg rename" operations
     1 /* Copyright 2003-2005 Joaquín M López Muñoz.
     2  * Distributed under the Boost Software License, Version 1.0.
     3  * (See accompanying file LICENSE_1_0.txt or copy at
     4  * http://www.boost.org/LICENSE_1_0.txt)
     5  *
     6  * See http://www.boost.org/libs/multi_index for library home page.
     7  */
     8 
     9 #ifndef BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP
    10 #define BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP
    11 
    12 #if defined(_MSC_VER)&&(_MSC_VER>=1200)
    13 #pragma once
    14 #endif
    15 
    16 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
    17 #include <boost/detail/workaround.hpp>
    18 
    19 #if BOOST_WORKAROUND(BOOST_MSVC,<1300)
    20 #include <boost/mpl/if.hpp>
    21 #include <boost/mpl/integral_c.hpp>
    22 #include <boost/mpl/aux_/msvc_never_true.hpp>
    23 #endif
    24 
    25 namespace boost{
    26 
    27 namespace multi_index{
    28 
    29 namespace detail{
    30 
    31 #if BOOST_WORKAROUND(BOOST_MSVC,<1300)
    32 /* See
    33  * http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Effective_MPL
    34  * Item 5.6, Beware of the 'early template instantiation' trap.
    35  */
    36 
    37 template<typename Type,typename Construct>
    38 struct prevent_eti
    39 {
    40   typedef typename mpl::if_<
    41     mpl::aux::msvc_never_true<Type>,
    42     mpl::integral_c<int,0>,
    43     Construct
    44   >::type type;
    45 };
    46 #else
    47 template<typename Type,typename Construct>
    48 struct prevent_eti
    49 {
    50   typedef Construct type;
    51 };
    52 #endif
    53 
    54 } /* namespace multi_index::detail */
    55 
    56 } /* namespace multi_index */
    57 
    58 } /* namespace boost */
    59 
    60 #endif