[Boost-commit] svn:boost r55488 - trunk/libs/spirit/example/karma

Subject: [Boost-commit] svn:boost r55488 - trunk/libs/spirit/example/karma
From: hartmut.kaiser_at_[hidden]
Date: 2009-08-09 13:12:47

Author: hkaiser
Date: 2009-08-09 13:12:47 EDT (Sun, 09 Aug 2009)
New Revision: 55488
URL: http://svn.boost.org/trac/boost/changeset/55488

Log:
Spirit: fixed calc_ast examples
Text files modified: 
   trunk/libs/spirit/example/karma/calc2_ast.hpp |    12 ++++++++++++                            
   1 files changed, 12 insertions(+), 0 deletions(-)

Modified: trunk/libs/spirit/example/karma/calc2_ast.hpp
==============================================================================
--- trunk/libs/spirit/example/karma/calc2_ast.hpp	(original)
+++ trunk/libs/spirit/example/karma/calc2_ast.hpp	2009-08-09 13:12:47 EDT (Sun, 09 Aug 2009)
@@ -81,6 +81,18 @@
     {
         return boost::get<T>(expr.expr);
     }
+
+    // the specialization below tells Spirit to handle expression_ast as if it 
+    // where a 'real' variant
+    namespace spirit { namespace traits
+    {
+        template <typename T>
+        struct not_is_variant;
+
+        template <>
+        struct not_is_variant<expression_ast>
+          : mpl::false_ {};
+    }}
 }
 
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