1 files changed, 43 insertions, 0 deletions
diff --git a/boost/metaparse/v1/if_.hpp b/boost/metaparse/v1/if_.hpp
new file mode 100644
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+++ b/boost/metaparse/v1/if_.hpp
@@ -0,0 +1,43 @@
+#ifndef BOOST_METAPARSE_V1_IF__HPP
+#define BOOST_METAPARSE_V1_IF__HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu)  2009 - 2010.
+// 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/metaparse/v1/accept.hpp>
+#include <boost/metaparse/v1/is_error.hpp>
+
+#include <boost/mpl/if.hpp>
+
+namespace boost
+{
+  namespace metaparse
+  {
+    namespace v1
+    {
+      template <class P, class T, class F>
+      struct if_
+      {
+        typedef if_ type;
+        
+        template <class S, class Pos>
+        struct apply :
+          accept<
+            typename boost::mpl::if_<
+              is_error<typename P::template apply<S, Pos> >,
+              F,
+              T
+            >::type,
+            S,
+            Pos
+          >
+        {};
+      };
+    }
+  }
+}
+
+#endif
+