Add auto_free_ref to auto_free stuff; bug 6694

Also add auto_free.h to EXTRA_DIST.

1 files changed, 23 insertions, 5 deletions

diff --git a/auto_free.h b/auto_free.h
index b13e7371..58290821 100644
--- a/auto_free.h
+++ b/auto_free.h
@@ -27,14 +27,32 @@ public:
   }
 private:
   // No copying allowed.
-  auto_free(const auto_free& af)
+  auto_free(const auto_free& af);
+  // No assignment either
+  auto_free& operator=(const auto_free& rhs);
+  void* _ptr;
+};
+
+// Use this to free a pointer whose value may change after the initial
+// allocation e.g., be realloced.
+template <typename T>
+class auto_free_ref
+{
+public:
+  typedef T pointer_type;
+  auto_free_ref(pointer_type& ptr) : _ptr(ptr)
   {
   }
-  // No assignment either
-  auto_free& operator=(const auto_free& rhs)
+  ~auto_free_ref()
   {
-    return *this;
+    if (_ptr)
+      std::free(_ptr);
   }
-  void* _ptr;
+private:
+  // No copying allowed.
+  auto_free_ref(const auto_free_ref& af);
+  // No assignment either
+  auto_free_ref& operator=(const auto_free_ref& rhs);
+  pointer_type& _ptr;
 };
 #endif