Ticket #3886: boost-future-unique_lock.patch

boost/thread/future.hpp

@@ -412 +412 @@
                 {
                     for(unsigned i=0;i<count;++i)
                     {
-                        locks[i]=boost::unique_lock<boost::mutex>(futures[i].future->mutex);
+                        locks[i].swap(boost::unique_lock<boost::mutex>(futures[i].future->mutex));
                     }
                 }