From 9d72b47984f61d0c2bb724fa7bf6d54f988384c9 Mon Sep 17 00:00:00 2001
From: michi_cc <michi_cc@openttd.org>
Date: Sat, 4 Feb 2012 13:28:35 +0000
Subject: (svn r23880) -Add: A simple smart pointer.

---
 src/core/alloc_type.hpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'src/core')

diff --git a/src/core/alloc_type.hpp b/src/core/alloc_type.hpp
index 6caaf916a..9c25cc9e3 100644
--- a/src/core/alloc_type.hpp
+++ b/src/core/alloc_type.hpp
@@ -180,4 +180,38 @@ public:
 	inline void operator delete[](void *ptr) { free(ptr); }
 };
 
+/**
+ * A smart pointer class that free()'s the pointer on destruction.
+ * @tparam T Storage type.
+ */
+template <typename T>
+class AutoFreePtr
+{
+	T *ptr; ///< Stored pointer.
+
+public:
+	AutoFreePtr(T *ptr) : ptr(ptr) {}
+	~AutoFreePtr() { free(this->ptr); }
+
+	/**
+	 * Take ownership of a new pointer and free the old one if needed.
+	 * @param ptr NEw pointer.
+	 */
+	inline void Assign(T *ptr)
+	{
+		free(this->ptr);
+		this->ptr = ptr;
+	}
+
+	/** Dereference pointer. */
+	inline T *operator ->() { return this->ptr; }
+	/** Dereference pointer. */
+	inline const T *operator ->() const { return this->ptr; }
+
+	/** Cast to underlaying regular pointer. */
+	inline operator T *() { return this->ptr; }
+	/** Cast to underlaying regular pointer. */
+	inline operator const T *() const { return this->ptr; }
+};
+
 #endif /* ALLOC_TYPE_HPP */
-- 
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