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engines/qdengine/qdcore/util/Handle.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 QDENGINE_QDCORE_UTIL_HANDLE_H
+#define QDENGINE_QDCORE_UTIL_HANDLE_H
+
+
+namespace QDEngine {
+
+////////////////////////////////////////////////////////////////////
+// Автоматически удаляемый указатель
+////////////////////////////////////////////////////////////////////
+template<class T>
+class PtrHandle {
+public:
+	PtrHandle(T *p = 0) : ptr(p) {}
+	PtrHandle(PtrHandle &p) : ptr(p.release()) {}
+	~PtrHandle() {
+		delete ptr;
+	}
+
+	void set(T *p) {
+		ptr = p;
+	}
+
+	PtrHandle &operator=(PtrHandle &p) {
+		if (get() != p.get()) {
+			delete ptr;
+			ptr = p.release();
+		}
+		return *this;
+	}
+
+	PtrHandle &operator=(T *p) {
+		if (get() != p)
+			delete ptr;
+		set(p);
+		return *this;
+	}
+
+	T *get() const {
+		return ptr;
+	}
+	T *release() {
+		T *tmp = ptr;
+		ptr = 0;
+		return tmp;
+	}
+
+	T *operator->() const {
+		return ptr;
+	}
+	T &operator*() const {
+		return *ptr;
+	}
+	T *operator()() const {
+		return ptr;
+	}
+	operator T *() const {
+		return ptr;
+	}
+
+private:
+	T *ptr;
+};
+
+////////////////////////////////////////////////////////////////////
+// Автоматически удаляемый указатель
+// с отслеживанием владельцев.
+// Обекты должны наследовать ShareHandleBase
+////////////////////////////////////////////////////////////////////
+template<class T>
+class ShareHandle {
+public:
+	ShareHandle(T *p = 0) {
+		set(p);
+	}
+	ShareHandle(const ShareHandle &orig) {
+		set(orig.ptr);
+	}
+
+	~ShareHandle() {
+		if (ptr && !ptr->decrRef())
+			delete ptr;
+	}
+
+	void set(T *p) {
+		ptr = p;
+		if (p)
+			p->addRef();
+	}
+
+	ShareHandle &operator=(const ShareHandle &orig) {
+		if (ptr && !ptr->decrRef() && ptr != orig.ptr)
+			delete ptr;
+		set(orig.ptr);
+		return *this;
+	}
+
+	ShareHandle &operator=(T *p) {
+		if (ptr && !ptr->decrRef() && ptr != p)
+			delete ptr;
+		set(p);
+		return *this;
+	}
+
+	T *get() const {
+		return ptr;
+	}
+	T *release() {
+		T *tmp = ptr;
+		if (ptr) ptr->decrRef();
+		ptr = 0;
+		return tmp;
+	}
+
+	T *operator->() const {
+		return ptr;
+	}
+	T &operator*() const {
+		return *ptr;
+	}
+	T *operator()() const {
+		return ptr;
+	}
+	operator T *() const {
+		return ptr;
+	}
+
+private:
+	T *ptr;
+};
+
+class ShareHandleBase {
+public:
+	ShareHandleBase() {
+		handleCount = 0;
+	}
+	ShareHandleBase(const ShareHandleBase &) {
+		handleCount = 0;
+	}
+	~ShareHandleBase() {}
+	void addRef() {
+		++handleCount;
+	}
+	int decrRef() {
+		return --handleCount;
+	}
+	int numRef() const {
+		return handleCount;
+	}
+
+private:
+	mutable int handleCount;
+};
+
+} // namespace QDEngine
+
+#endif // QDENGINE_QDCORE_UTIL_HANDLE_H