From a3c329a6f82d72152e0cc3c7b33027fce90c6d3e Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Tue, 1 Oct 2013 14:44:54 +0100
Subject: [PATCH] == Boost.Python std::shared_ptr ==

+ ensure mapnik::memory_datasource is wrapped in std::shared_ptr in Python bindings
+ register implicit conversion from std::shared_ptr<memory_datasource> to std::shared_pre<datasource>

ref #2020
---
 bindings/python/mapnik_datasource.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/bindings/python/mapnik_datasource.cpp b/bindings/python/mapnik_datasource.cpp
index 4ed1032d0..0fbd59438 100644
--- a/bindings/python/mapnik_datasource.cpp
+++ b/bindings/python/mapnik_datasource.cpp
@@ -190,7 +190,9 @@ void export_datasource()
 
     def("CreateDatasource",&create_datasource);
 
-    class_<memory_datasource, bases<datasource>, boost::noncopyable>("MemoryDatasource", init<>())
+    class_<memory_datasource,
+           bases<datasource>, std::shared_ptr<memory_datasource>,
+           boost::noncopyable>("MemoryDatasource", init<>())
         .def("add_feature",&memory_datasource::push,
              "Adds a Feature:\n"
              ">>> ms = MemoryDatasource()\n"
@@ -198,4 +200,6 @@ void export_datasource()
              ">>> ms.add_feature(Feature(1))\n")
         .def("num_features",&memory_datasource::size)
         ;
+
+    implicitly_convertible<std::shared_ptr<memory_datasource>,std::shared_ptr<datasource> >();
 }