From 666ff418dcb20d5f441cafe0b32b2ffddf3f7549 Mon Sep 17 00:00:00 2001
From: Artem Pavlenko <artem@mapnik.org>
Date: Wed, 24 Mar 2010 18:01:45 +0000
Subject: [PATCH] + add specialization for bool in to_expression_string()

---
 include/mapnik/value.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/mapnik/value.hpp b/include/mapnik/value.hpp
index fdf9d826f..5ef7105aa 100644
--- a/include/mapnik/value.hpp
+++ b/include/mapnik/value.hpp
@@ -611,6 +611,11 @@ struct to_expression_string : public boost::static_visitor<std::string>
 	return ss.str();
     }
 
+    std::string operator() (bool val) const
+    {
+	return val ? "true":"false";
+    }
+
     std::string operator() (value_null const& val) const
     {
 	boost::ignore_unused_variable_warning(val);