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40 lines
1.0 KiB
40 lines
1.0 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2007 Tobias Schwinger
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_FUSION_SEQUENCE_EMPTY_IMPL_HPP_INCLUDED)
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#define BOOST_FUSION_SEQUENCE_EMPTY_IMPL_HPP_INCLUDED
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#include <boost/fusion/support/config.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/fusion/container/list/nil.hpp>
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namespace boost { namespace fusion
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{
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struct cons_tag;
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struct nil_;
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template <typename Car, typename Cdr>
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struct cons;
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namespace extension
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{
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template <typename Tag>
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struct empty_impl;
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template <>
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struct empty_impl<cons_tag>
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{
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template <typename Sequence>
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struct apply
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: boost::is_convertible<Sequence, nil_>
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{};
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};
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}
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}}
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#endif
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