mpl/aux_/msvc_eti_base.hpp

0001
0002 #ifndef BOOST_MPL_AUX_MSVC_ETI_BASE_HPP_INCLUDED
0003 #define BOOST_MPL_AUX_MSVC_ETI_BASE_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2001-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/aux_/is_msvc_eti_arg.hpp>
0018 #include <boost/mpl/aux_/config/eti.hpp>
0019 #include <boost/mpl/aux_/config/gcc.hpp>
0020 #include <boost/mpl/aux_/config/workaround.hpp>
0021
0022 namespace boost { namespace mpl { namespace aux {
0023
0024 #if defined(BOOST_MPL_CFG_MSVC_70_ETI_BUG)
0025
0026 template< bool > struct msvc_eti_base_impl
0027 {
0028     template< typename T > struct result_
0029         : T
0030     {
0031         typedef T type;
0032     };
0033 };
0034
0035 template<> struct msvc_eti_base_impl<true>
0036 {
0037     template< typename T > struct result_
0038     {
0039         typedef result_ type;
0040         typedef result_ first;
0041         typedef result_ second;
0042         typedef result_ tag;
0043         enum { value = 0 };
0044     };
0045 };
0046
0047 template< typename T > struct msvc_eti_base
0048     : msvc_eti_base_impl< is_msvc_eti_arg<T>::value >
0049         ::template result_<T>
0050 {
0051 };
0052
0053 #else // !BOOST_MPL_CFG_MSVC_70_ETI_BUG
0054
0055 template< typename T > struct msvc_eti_base
0056     : T
0057 {
0058 #if BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304))
0059     msvc_eti_base();
0060 #endif
0061     typedef T type;
0062 };
0063
0064 #endif
0065
0066 template<> struct msvc_eti_base<int>
0067 {
0068     typedef msvc_eti_base type;
0069     typedef msvc_eti_base first;
0070     typedef msvc_eti_base second;
0071     typedef msvc_eti_base tag;
0072     enum { value = 0 };
0073 };
0074
0075 }}}
0076
0077 #endif // BOOST_MPL_AUX_MSVC_ETI_BASE_HPP_INCLUDED