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63 lines
1.4 KiB
63 lines
1.4 KiB
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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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// $Id$ |
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// $Date$ |
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// $Revision$ |
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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/mpl/aux_/lambda_support.hpp> |
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#include <boost/type_traits/integral_constant.hpp> |
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#include <boost/type_traits/is_empty.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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template<> struct is_empty< mpl::empty_base > |
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: public ::boost::integral_constant<bool,true> |
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{ |
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public: |
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BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(1,is_empty,(mpl::empty_base)) |
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}; |
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} |
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#endif // BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
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