1 files changed, 74 insertions, 0 deletions
diff --git a/boost/lockfree/detail/copy_payload.hpp b/boost/lockfree/detail/copy_payload.hpp
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+++ b/boost/lockfree/detail/copy_payload.hpp
@@ -0,0 +1,74 @@
+//  boost lockfree: copy_payload helper
+//
+//  Copyright (C) 2011 Tim Blechmann
+//
+//  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_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED
+#define BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED
+
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+
+namespace boost    {
+namespace lockfree {
+namespace detail   {
+
+struct copy_convertible
+{
+    template <typename T, typename U>
+    static void copy(T & t, U & u)
+    {
+        u = t;
+    }
+};
+
+struct copy_constructible_and_copyable
+{
+    template <typename T, typename U>
+    static void copy(T & t, U & u)
+    {
+        u = U(t);
+    }
+};
+
+template <typename T, typename U>
+void copy_payload(T & t, U & u)
+{
+    typedef typename boost::mpl::if_<typename boost::is_convertible<T, U>::type,
+                                     copy_convertible,
+                                     copy_constructible_and_copyable
+                                    >::type copy_type;
+    copy_type::copy(t, u);
+}
+
+template <typename T>
+struct consume_via_copy
+{
+    consume_via_copy(T & out):
+        out_(out)
+    {}
+
+    template <typename U>
+    void operator()(U & element)
+    {
+        copy_payload(element, out_);
+    }
+
+    T & out_;
+};
+
+struct consume_noop
+{
+    template <typename U>
+    void operator()(const U &)
+    {
+    }
+};
+
+
+}}}
+
+#endif  /* BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED */