detail::yield(k) added.

[SVN r43888]

test/yield_k_test.cpp

@@ -0,0 +1,23 @@
+//
+// yield_k_test.cpp
+//
+// Copyright 2008 Peter Dimov
+//
+// 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)
+//
+
+#include <boost/detail/yield_k.hpp>
+
+// Sanity check only
+
+int main()
+{
+    for( unsigned k = 0; k < 256; ++k )
+    {
+        boost::detail::yield( k );
+    }
+
+    return 0;
+}