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engines/tetraedge/te/te_intrusive_ptr.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef TETRAEDGE_TE_TE_INTRUSIVE_PTR_H
+#define TETRAEDGE_TE_TE_INTRUSIVE_PTR_H
+
+namespace Tetraedge {
+
+/**
+ Like the boost intrusive pointer.  To be used with an
+ object inheriting from TeReferencesCounter
+ */
+template<class T> class TeIntrusivePtr {
+public:
+	// NOTE: The original uses a member function for this, which is cleaner, but
+	// MSVC compiles member functions for different class types (forward
+	// declaration, multi-inheritance, etc) as different sizes which causes all
+	// sorts of issues.  Only accept a static function to avoid such problems.
+	typedef void(*Tdestructor)(T *obj);
+
+	TeIntrusivePtr() : _p(nullptr), _deleteFn(nullptr) {}
+
+	TeIntrusivePtr(const TeIntrusivePtr<T> &other) : _deleteFn(nullptr) {
+		_p = other._p;
+		if (_p)
+			_p->incrementCounter();
+	}
+
+	TeIntrusivePtr(T *obj) : _deleteFn(nullptr) {
+		_p = obj;
+		if (_p)
+			_p->incrementCounter();
+	}
+
+	virtual ~TeIntrusivePtr() {
+		release();
+	}
+
+	TeIntrusivePtr<T> &operator=(T *obj) {
+		if (_p != obj) {
+			release();
+			_p = obj;
+			if (_p)
+				_p->incrementCounter();
+		}
+		return *this;
+	}
+
+	TeIntrusivePtr<T> &operator=(const TeIntrusivePtr<T> &other) {
+		if (this != &other) {
+			release();
+			_p = other._p;
+			_deleteFn = other._deleteFn;
+			if (_p)
+				_p->incrementCounter();
+		}
+		return *this;
+	}
+
+	void release() {
+		if (_p) {
+			if (_p->decrementCounter()) {
+				if (_deleteFn)
+					(_deleteFn)(_p);
+				else
+					delete _p;
+			}
+		}
+		_p = nullptr;
+	}
+
+	bool operator==(const TeIntrusivePtr<T> &other) const {
+		return (this == &other || _p == other._p);
+	}
+
+	T *get() {
+		return _p;
+	}
+
+	const T *get() const {
+		return _p;
+	}
+
+	T &operator*() {
+		return *_p;
+	}
+
+	const T &operator*() const {
+		return *_p;
+	}
+
+	operator bool() const {
+		return _p != nullptr;
+	}
+
+	T *operator->() {
+		return _p;
+	}
+
+	const T *operator->() const {
+		return _p;
+	}
+
+	void setDeleteFn(Tdestructor destructor) {
+		_deleteFn = destructor;
+	}
+
+private:
+	T *_p;
+	Tdestructor _deleteFn;
+};
+
+} // end namespace Tetraedge
+
+#endif // TETRAEDGE_TE_TE_INTRUSIVE_PTR_H