1 files changed, 12 insertions, 0 deletions
diff --git a/src/common.hpp b/src/common.hpp
index 4cea1633..0363c334 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -412,5 +412,17 @@ RunIterable<T> runs(const ::std::vector<T>& x) {
     return RunIterable<T>(x);
 }
 
+template<typename T>
+class NullOnDrop {
+    T*& ptr;
+public:
+    NullOnDrop(T*& ptr):
+        ptr(ptr)
+    {}
+    ~NullOnDrop() {
+        ptr = nullptr;
+    }
+};
+
 
 #endif