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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) 2001-2006 Joel de Guzman
Copyright (c) 2007 Tobias Schwinger
Use, modification and distribution is subject to the Boost Software Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -9,6 +10,7 @@
#define FUSION_SEQUENCE_BASE_04182005_0737 #define FUSION_SEQUENCE_BASE_04182005_0737
#include <boost/fusion/support/detail/compiler_config.hpp> #include <boost/fusion/support/detail/compiler_config.hpp>
#include <boost/mpl/begin_end_fwd.hpp>
namespace boost { namespace fusion namespace boost { namespace fusion
{ {
@ -29,6 +31,17 @@ namespace boost { namespace fusion
return static_cast<Sequence&>(*this); 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 #endif