From 4c46385bf6867004ea86c9795fbbece34cc746d8 Mon Sep 17 00:00:00 2001
From: Tom MacWright <tom@macwright.org>
Date: Thu, 26 Jan 2012 17:40:02 -0500
Subject: [PATCH] Work around non-numeric input

---
 src/memory_datasource.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/memory_datasource.cpp b/src/memory_datasource.cpp
index 11889fe63..a738ee683 100644
--- a/src/memory_datasource.cpp
+++ b/src/memory_datasource.cpp
@@ -72,7 +72,11 @@ void memory_datasource::push(feature_ptr feature)
     std::map<std::string,mapnik::value>::const_iterator it = fprops.begin();
     std::map<std::string,mapnik::value>::const_iterator end = fprops.end();
     for (; it != end; ++it) {
-        accumulators_[it->first](it->second.to_double());
+        try {
+            accumulators_[it->first](it->second.to_double());
+        } catch(boost::bad_lexical_cast &) {
+            // string values are not accumulated.
+        }
     }
     features_.push_back(feature);
 }