add missing file from previous commit

bindings/python/mapnik_inmem_metawriter.cpp

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+/*****************************************************************************
+ * 
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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
+ *
+ *****************************************************************************/
+//$Id$
+
+// boost
+#include <boost/python.hpp>
+#include <boost/python/module.hpp>
+#include <boost/python/def.hpp>
+
+// mapnik
+#include <mapnik/metawriter_inmem.hpp>
+
+using mapnik::metawriter_inmem;
+using mapnik::metawriter_inmem_ptr;
+
+namespace {
+std::map<std::string, mapnik::value>::const_iterator 
+mapnik_value_map_begin(const std::map<std::string, mapnik::value> &m) {
+  return m.begin();
+}
+
+std::map<std::string, mapnik::value>::const_iterator 
+mapnik_value_map_end(const std::map<std::string, mapnik::value> &m) {
+  return m.end();
+}
+}
+
+void export_inmem_metawriter() {
+  using namespace boost::python;
+
+  class_<std::map<std::string, mapnik::value> >
+    ("MapnikProperties", "Retarded.", init<>())
+    .def("__iter__", range(&mapnik_value_map_begin, &mapnik_value_map_end))
+    ;
+
+  class_<metawriter_inmem::meta_instance>
+    ("MetaInstance", "Single rendered instance of meta-information.", no_init)
+    .def_readonly("box", &metawriter_inmem::meta_instance::box)
+    .def_readonly("properties", &metawriter_inmem::meta_instance::properties)
+    ;
+
+  class_<metawriter_inmem, metawriter_inmem_ptr, boost::noncopyable>
+    ("MetaWriterInMem", 
+     "Collects meta-information about elements rendered.",
+     no_init)
+    .def("__iter__", range(&metawriter_inmem::inst_begin,
+                           &metawriter_inmem::inst_end))
+    ;
+}