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Source/Engine/Core/DeleteMe.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+/// <summary>
+/// Helper class used to delete another object.
+/// </summary>
+template<class T, class MemoryAllocator = Allocator>
+class DeleteMe
+{
+private:
+
+    T* _toDelete;
+
+    DeleteMe()
+    {
+    }
+
+    DeleteMe(const DeleteMe&)
+    {
+    };
+
+    DeleteMe& operator=(const DeleteMe&)
+    {
+        return *this;
+    };
+
+public:
+
+    /// <summary>
+    /// Init
+    /// </summary>
+    /// <param name="toDelete">Object to delete</param>
+    explicit DeleteMe(T* toDelete)
+        : _toDelete(toDelete)
+    {
+    }
+
+    /// <summary>
+    /// Destructor
+    /// </summary>
+    ~DeleteMe()
+    {
+        if (_toDelete)
+            ::Delete<T, MemoryAllocator>(_toDelete);
+    }
+
+public:
+
+    /// <summary>
+    /// Delete linked object and assign new one
+    /// </summary>
+    /// <param name="other">New object</param>
+    void DeleteAndSetNew(T* other)
+    {
+        ASSERT(other);
+        if (_toDelete)
+        {
+            ::Delete<T, MemoryAllocator>(_toDelete);
+        }
+        _toDelete = other;
+    }
+
+    /// <summary>
+    /// Delete linked object
+    /// </summary>
+    void Delete()
+    {
+        if (_toDelete)
+        {
+            ::Delete<T, MemoryAllocator>(_toDelete);
+            _toDelete = nullptr;
+        }
+    }
+
+    FORCE_INLINE bool IsSet() const
+    {
+        return _toDelete != nullptr;
+    }
+
+    FORCE_INLINE bool IsMissing() const
+    {
+        return _toDelete == nullptr;
+    }
+
+    FORCE_INLINE T* Get() const
+    {
+        return _toDelete;
+    }
+
+public:
+
+    /// <summary>
+    /// Object
+    /// </summary>
+    /// <returns></returns>
+    T* operator->()
+    {
+        return _toDelete;
+    }
+
+    /// <summary>
+    /// Object
+    /// </summary>
+    /// <returns>Object</returns>
+    const T* operator->() const
+    {
+        return _toDelete;
+    }
+
+    /// <summary>
+    /// Object
+    /// </summary>
+    /// <returns>Object</returns>
+    T* operator*()
+    {
+        return _toDelete;
+    }
+
+    /// <summary>
+    /// Object
+    /// </summary>
+    /// <returns>Object</returns>
+    const T& operator*() const
+    {
+        return *_toDelete;
+    }
+};