From 2564c004200a13efc84bdda59d1838ea9300d11e Mon Sep 17 00:00:00 2001
From: Dane Springmeyer <dane@dbsgeo.com>
Date: Wed, 13 Nov 2013 18:44:58 -0800
Subject: [PATCH] expression parser - avoid extra level of indirection

---
 src/expression.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/expression.cpp b/src/expression.cpp
index 44629de63..42e2fd022 100644
--- a/src/expression.cpp
+++ b/src/expression.cpp
@@ -44,13 +44,13 @@ expression_ptr parse_expression(std::string const& str, std::string const& encod
 expression_ptr parse_expression(std::string const& str,
                                 mapnik::expression_grammar<std::string::const_iterator> const& g)
 {
-    expr_node node;
+    expression_ptr node = boost::make_shared<expr_node>();
     std::string::const_iterator itr = str.begin();
     std::string::const_iterator end = str.end();
-    bool r = boost::spirit::qi::phrase_parse(itr, end, g, boost::spirit::standard_wide::space, node);
+    bool r = boost::spirit::qi::phrase_parse(itr, end, g, boost::spirit::standard_wide::space, *node);
     if (r && itr == end)
     {
-        return boost::make_shared<expr_node>(node);
+        return node;
     }
     else
     {