Return std::unique_ptr member as const ref

Returning raw pointer has a risk that it may be stolen by
std::shared_ptr in accident.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/SimpleRandomizer.h b/src/SimpleRandomizer.h
index 457bdcb1..f1670413 100644
--- a/src/SimpleRandomizer.h
+++ b/src/SimpleRandomizer.h
@@ -56,7 +56,7 @@ private:
   SimpleRandomizer();
 public:
 
-  static SimpleRandomizer* getInstance();
+  static const std::unique_ptr<SimpleRandomizer>& getInstance();
 
   static void init();