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diff --git a/src/boost/libs/metaparse/example/meta_hs/semantic.hpp b/src/boost/libs/metaparse/example/meta_hs/semantic.hpp
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+++ b/src/boost/libs/metaparse/example/meta_hs/semantic.hpp
@@ -0,0 +1,115 @@
+#ifndef META_HS_SEMANTIC_HPP
+#define META_HS_SEMANTIC_HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu)  2012.
+// 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 <ast.hpp>
+#include <curry.hpp>
+
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/apply_wrap.hpp>
+#include <boost/mpl/front.hpp>
+#include <boost/mpl/back.hpp>
+#include <boost/mpl/at.hpp>
+#include <boost/mpl/pair.hpp>
+
+namespace semantic
+{
+  struct ref
+  {
+    typedef ref type;
+  
+    template <class Name>
+    struct apply : ast::ref<Name> {};
+  };
+  
+  struct value
+  {
+    typedef value type;
+  
+    template <class V>
+    struct apply : ast::value<V> {};
+  };
+  
+  struct lambda
+  {
+    typedef lambda type;
+  
+    template <class F, class ArgName>
+    struct apply : ast::lambda<F, ArgName> {};
+  };
+  
+  struct application
+  {
+    typedef application type;
+  
+    template <class F, class Arg>
+    struct apply : ast::application<F, Arg> {};
+  };
+  
+  class if_
+  {
+  private:
+    template <class C, class T, class F>
+    struct lazy_if : boost::mpl::if_<typename C::type, T, F> {};
+  public:
+    typedef if_ type;
+  
+    template <class Seq>
+    struct apply :
+      boost::mpl::apply_wrap2<
+        application,
+        typename boost::mpl::apply_wrap2<
+          application,
+          typename boost::mpl::apply_wrap2<
+            application,
+            ast::value<curry3<lazy_if> >,
+            typename boost::mpl::at_c<Seq, 0>::type
+          >::type,
+          typename boost::mpl::at_c<Seq, 1>::type
+        >::type,
+        typename boost::mpl::at_c<Seq, 2>::type
+      >
+    {};
+  };
+  
+  struct binary_op
+  {
+    typedef binary_op type;
+  
+    template <class Exp, class C>
+    struct apply :
+      boost::mpl::apply_wrap2<
+        application,
+        typename boost::mpl::apply_wrap2<
+          application,
+          typename boost::mpl::apply_wrap1<
+            ref,
+            typename boost::mpl::front<C>::type
+          >::type,
+          Exp
+        >::type,
+        typename boost::mpl::back<C>::type
+      >
+    {};
+  };
+  
+  struct pair
+  {
+    typedef pair type;
+  
+    template <class Seq>
+    struct apply :
+      boost::mpl::pair<
+        typename boost::mpl::front<Seq>::type,
+        ast::top_bound<typename boost::mpl::back<Seq>::type>
+      >
+    {};
+  };
+}
+
+#endif
+