Imported existing code

libraries/include/boost/spirit/home/classic/attribute/closure_context.hpp

@@ -0,0 +1,56 @@
+/*=============================================================================
+    Copyright (c) 2002-2003 Joel de Guzman
+    Copyright (c) 2002-2003 Hartmut Kaiser
+    http://spirit.sourceforge.net/
+
+  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)
+=============================================================================*/
+#if !defined(BOOST_SPIRIT_CLOSURE_CONTEXT_HPP)
+#define BOOST_SPIRIT_CLOSURE_CONTEXT_HPP
+
+#include <boost/spirit/home/classic/namespace.hpp>
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost { namespace spirit {
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
+
+#if !defined(BOOST_SPIRIT_CLOSURE_CONTEXT_LINKER_DEFINED)
+#define BOOST_SPIRIT_CLOSURE_CONTEXT_LINKER_DEFINED
+
+///////////////////////////////////////////////////////////////////////////////
+//
+//  closure_context_linker
+//  { helper template for the closure extendability }
+//
+//      This classes can be 'overloaded' (defined elsewhere), to plug
+//      in additional functionality into the closure parsing process.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+template<typename ContextT>
+struct closure_context_linker : public ContextT
+{
+    template <typename ParserT>
+    closure_context_linker(ParserT const& p)
+    : ContextT(p) {}
+
+    template <typename ParserT, typename ScannerT>
+    void pre_parse(ParserT const& p, ScannerT const& scan)
+    { ContextT::pre_parse(p, scan); }
+
+    template <typename ResultT, typename ParserT, typename ScannerT>
+    ResultT&
+    post_parse(ResultT& hit, ParserT const& p, ScannerT const& scan)
+    { return ContextT::post_parse(hit, p, scan); }
+};
+
+#endif // !defined(BOOST_SPIRIT_CLOSURE_CONTEXT_LINKER_DEFINED)
+
+///////////////////////////////////////////////////////////////////////////////
+BOOST_SPIRIT_CLASSIC_NAMESPACE_END
+
+}} // namespace BOOST_SPIRIT_CLASSIC_NS
+
+#endif // BOOST_SPIRIT_CLOSURE_CONTEXT_HPP