Imported existing code

libraries/include/boost/spirit/home/qi/detail/fail_function.hpp

@@ -0,0 +1,50 @@
+/*=============================================================================
+    Copyright (c) 2001-2007 Joel de Guzman
+
+    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(SPIRIT_FAIL_FUNCTION_APR_22_2006_0159PM)
+#define SPIRIT_FAIL_FUNCTION_APR_22_2006_0159PM
+
+#include <boost/spirit/home/support/unused.hpp>
+
+namespace boost { namespace spirit { namespace qi { namespace detail
+{
+    template <typename Iterator, typename Context, typename Skipper>
+    struct fail_function
+    {
+        fail_function(
+            Iterator& first, Iterator const& last
+          , Context& context, Skipper const& skipper)
+          : first(first)
+          , last(last)
+          , context(context)
+          , skipper(skipper)
+        {
+        }
+
+        template <typename Component, typename Attribute>
+        bool operator()(Component const& component, Attribute& attr)
+        {
+            // return true if the parser fails
+            typedef typename Component::director director;
+            return !director::parse(component, first, last, context, skipper, attr);
+        }
+
+        template <typename Component>
+        bool operator()(Component const& component)
+        {
+            // return true if the parser fails
+            typedef typename Component::director director;
+            return !director::parse(component, first, last, context, skipper, unused);
+        }
+
+        Iterator& first;
+        Iterator const& last;
+        Context& context;
+        Skipper const& skipper;
+    };
+}}}}
+
+#endif