From 6f4f7a07beec79dd299a59811321011101b25ea3 Mon Sep 17 00:00:00 2001
From: Blake Thompson <flippmoke@gmail.com>
Date: Thu, 2 Apr 2015 09:28:45 -0500
Subject: [PATCH] Added a feature to geojson helper method

---
 include/mapnik/util/feature_to_geojson.hpp | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 include/mapnik/util/feature_to_geojson.hpp

diff --git a/include/mapnik/util/feature_to_geojson.hpp b/include/mapnik/util/feature_to_geojson.hpp
new file mode 100644
index 000000000..fbf2aa5dd
--- /dev/null
+++ b/include/mapnik/util/feature_to_geojson.hpp
@@ -0,0 +1,42 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2014 Artem Pavlenko
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_FEATURE_TO_GEOJSON_HPP
+#define MAPNIK_FEATURE_TO_GEOJSON_HPP
+
+// mapnik
+
+#include <mapnik/json/feature_generator_grammar.hpp>
+
+namespace mapnik { namespace util {
+
+inline bool to_geojson(std::string & json, mapnik::feature_impl const& feat)
+{
+    using sink_type = std::back_insert_iterator<std::string>;
+    static const mapnik::json::feature_generator_grammar<sink_type, mapnik::feature_impl> grammar;
+    sink_type sink(json);
+    return boost::spirit::karma::generate(sink, grammar, feat);
+}
+
+}}
+
+#endif // MAPNIK_FEATURE_TO_GEOJSON_HPP