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diff --git a/boost/coroutine/detail/parameters.hpp b/boost/coroutine/detail/parameters.hpp
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+
+//          Copyright Oliver Kowalke 2009.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_COROUTINES_DETAIL_PARAMETERS_H
+#define BOOST_COROUTINES_DETAIL_PARAMETERS_H
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+
+#include <boost/coroutine/detail/flags.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace coroutines {
+namespace detail {
+
+template< typename Data >
+struct parameters
+{
+    Data                *   data;
+    bool                    do_unwind;
+    void                *   coro;
+
+    parameters() :
+        data( 0), do_unwind( false), coro( 0)
+    {}
+
+    explicit parameters( void * coro_) :
+        data( 0), do_unwind( false), coro( coro_)
+    { BOOST_ASSERT( 0 != coro); }
+
+    explicit parameters( Data * data_, void * coro_) :
+        data( data_), do_unwind( false), coro( coro_)
+    {
+        BOOST_ASSERT( 0 != data);
+        BOOST_ASSERT( 0 != coro);
+    }
+
+    explicit parameters( unwind_t::flag_t) :
+        data( 0), do_unwind( true)
+    {}
+};
+
+template< typename Data >
+struct parameters< Data & >
+{
+    Data                *   data;
+    bool                    do_unwind;
+    void                *   coro;
+
+    parameters() :
+        data( 0), do_unwind( false), coro( 0)
+    {}
+
+    explicit parameters( void * coro_) :
+        data( 0), do_unwind( false), coro( coro_)
+    { BOOST_ASSERT( 0 != coro); }
+
+    explicit parameters( Data * data_, void * coro_) :
+        data( data_), do_unwind( false), coro( coro_)
+    {
+        BOOST_ASSERT( 0 != data);
+        BOOST_ASSERT( 0 != coro);
+    }
+
+    explicit parameters( unwind_t::flag_t) :
+        data( 0), do_unwind( true), coro( 0)
+    {}
+};
+
+template<>
+struct parameters< void >
+{
+    bool                    do_unwind;
+    void                *   coro;
+
+    parameters() :
+        do_unwind( false), coro(0)
+    {}
+
+    parameters( void * coro_) :
+        do_unwind( false), coro( coro_)
+    { BOOST_ASSERT( 0 != coro); }
+
+    explicit parameters( unwind_t::flag_t) :
+        do_unwind( true), coro( 0)
+    {}
+};
+
+}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_COROUTINES_DETAIL_PARAMETERS_H