author | Mike Kinghan <mikek@symbian.org> |
Wed, 01 Dec 2010 12:02:41 +0000 | |
changeset 42 | cf609178ac39 |
parent 2 | 39c28ec933dd |
permissions | -rwxr-xr-x |
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#ifndef BOOST_MPL_EMPTY_BASE_HPP_INCLUDED |
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#define BOOST_MPL_EMPTY_BASE_HPP_INCLUDED |
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// Copyright Aleksey Gurtovoy 2001-2004 |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/mpl for documentation. |
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// $Id: empty_base.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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// $Revision: 49267 $ |
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#include <boost/mpl/bool.hpp> |
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#include <boost/mpl/aux_/config/msvc.hpp> |
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#include <boost/mpl/aux_/config/workaround.hpp> |
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#include <boost/type_traits/is_empty.hpp> |
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// should be always the last #include directive |
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#include <boost/type_traits/detail/bool_trait_def.hpp> |
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namespace boost { namespace mpl { |
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// empty base class, guaranteed to have no members; inheritance from |
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// 'empty_base' through the 'inherit' metafunction is a no-op - see |
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// "mpl/inherit.hpp> header for the details |
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struct empty_base {}; |
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template< typename T > |
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struct is_empty_base |
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: false_ |
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{ |
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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using false_::value; |
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#endif |
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}; |
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template<> |
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struct is_empty_base<empty_base> |
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: true_ |
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{ |
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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using true_::value; |
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#endif |
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}; |
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}} |
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namespace boost { |
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BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_empty, mpl::empty_base, true) |
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} |
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#include <boost/type_traits/detail/bool_trait_undef.hpp> |
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#endif // BOOST_MPL_EMPTY_BASE_HPP_INCLUDED |