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prevents potential ODR violation through mpl::begin / mpl::is_sequence

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[SVN r36727]
This commit is contained in:
Tobias Schwinger
2007-01-14 13:35:28 +00:00
parent bc7d10ec94
commit c5f8494832
1 changed files with 13 additions and 0 deletions
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13
include/boost/fusion/support/sequence_base.hpp
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@ -1,5 +1,6 @@
/*=============================================================================
Copyright (c) 2001-2006 Joel de Guzman
Copyright (c) 2007 Tobias Schwinger
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -9,6 +10,7 @@
#define FUSION_SEQUENCE_BASE_04182005_0737
#include <boost/fusion/support/detail/compiler_config.hpp>
#include <boost/mpl/begin_end_fwd.hpp>
namespace boost { namespace fusion
{
@ -29,6 +31,17 @@ namespace boost { namespace fusion
return static_cast<Sequence&>(*this);
}
};
struct fusion_sequence_tag;
}}
namespace boost { namespace mpl
{
// Deliberately break mpl::begin, so it doesn't lie that a Fusion sequence
// is not an MPL sequence by returning mpl::void_.
// In other words: Fusion Sequences are always MPL Sequences, but they can
// be incompletely defined.
template<> struct begin_impl< boost::fusion::fusion_sequence_tag >;
}}
#endif