forked from boostorg/mpl
77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/aux_/select2nd_wknd.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2003
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// Eric Friedman, Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#ifndef BOOST_MPL_AUX_SELECT2ND_WKND_HPP_INCLUDED
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#define BOOST_MPL_AUX_SELECT2ND_WKND_HPP_INCLUDED
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#include "boost/mpl/aux_/is_msvc_eti_arg.hpp"
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#include "boost/mpl/aux_/config/eti.hpp"
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#if defined(BOOST_MPL_MSVC_ETI_BUG)
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namespace boost { namespace mpl { namespace aux {
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# if defined(BOOST_MPL_MSVC_60_ETI_BUG)
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template< typename Pair >
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struct select2nd_wknd
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{
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typedef typename Pair::second type;
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};
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template<> struct select2nd_wknd<int>
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{
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typedef int type;
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};
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# else // !defined(BOOST_MPL_MSVC_60_ETI_BUG)
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template< bool > struct select2nd_wknd_impl
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{
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template< typename Pair > struct result_
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{
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typedef typename Pair::second type;
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};
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};
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template<> struct select2nd_wknd_impl<false>
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{
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template< typename Pair > struct result_
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{
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typedef int type;
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};
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};
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template< typename Pair > struct select2nd_wknd
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: select2nd_wknd_impl< !aux::is_msvc_eti_arg<Pair>::value >
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::template result_<Pair>
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{
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};
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# endif // BOOST_MPL_MSVC_60_ETI_BUG workaround
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}}} // namespace boost::mpl::aux
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# define BOOST_MPL_AUX_SELECT2ND_WKND(pair) ::boost::mpl::aux::select2nd_wknd< pair >::type
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#else // !defined(BOOST_MPL_MSVC_ETI_BUG)
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# define BOOST_MPL_AUX_SELECT2ND_WKND(pair) pair::second
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#endif // BOOST_MPL_MSVC_ETI_BUG workaround
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#endif // BOOST_MPL_AUX_SELECT2ND_WKND_HPP_INCLUDED
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