179 lines
3.4 KiB
C++
179 lines
3.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef QDENGINE_QDCORE_UTIL_HANDLE_H
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#define QDENGINE_QDCORE_UTIL_HANDLE_H
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namespace QDEngine {
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////////////////////////////////////////////////////////////////////
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// Автоматически удаляемый указатель
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////////////////////////////////////////////////////////////////////
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template<class T>
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class PtrHandle {
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public:
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PtrHandle(T *p = 0) : ptr(p) {}
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PtrHandle(PtrHandle &p) : ptr(p.release()) {}
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~PtrHandle() {
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delete ptr;
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}
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void set(T *p) {
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ptr = p;
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}
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PtrHandle &operator=(PtrHandle &p) {
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if (get() != p.get()) {
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delete ptr;
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ptr = p.release();
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}
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return *this;
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}
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PtrHandle &operator=(T *p) {
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if (get() != p)
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delete ptr;
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set(p);
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return *this;
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}
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T *get() const {
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return ptr;
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}
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T *release() {
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T *tmp = ptr;
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ptr = 0;
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return tmp;
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}
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T *operator->() const {
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return ptr;
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}
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T &operator*() const {
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return *ptr;
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}
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T *operator()() const {
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return ptr;
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}
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operator T *() const {
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return ptr;
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}
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private:
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T *ptr;
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};
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////////////////////////////////////////////////////////////////////
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// Автоматически удаляемый указатель
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// с отслеживанием владельцев.
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// Обекты должны наследовать ShareHandleBase
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////////////////////////////////////////////////////////////////////
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template<class T>
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class ShareHandle {
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public:
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ShareHandle(T *p = 0) {
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set(p);
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}
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ShareHandle(const ShareHandle &orig) {
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set(orig.ptr);
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}
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~ShareHandle() {
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if (ptr && !ptr->decrRef())
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delete ptr;
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}
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void set(T *p) {
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ptr = p;
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if (p)
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p->addRef();
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}
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ShareHandle &operator=(const ShareHandle &orig) {
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if (ptr && !ptr->decrRef() && ptr != orig.ptr)
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delete ptr;
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set(orig.ptr);
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return *this;
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}
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ShareHandle &operator=(T *p) {
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if (ptr && !ptr->decrRef() && ptr != p)
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delete ptr;
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set(p);
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return *this;
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}
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T *get() const {
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return ptr;
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}
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T *release() {
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T *tmp = ptr;
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if (ptr) ptr->decrRef();
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ptr = 0;
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return tmp;
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}
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T *operator->() const {
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return ptr;
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}
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T &operator*() const {
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return *ptr;
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}
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T *operator()() const {
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return ptr;
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}
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operator T *() const {
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return ptr;
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}
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private:
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T *ptr;
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};
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class ShareHandleBase {
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public:
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ShareHandleBase() {
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handleCount = 0;
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}
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ShareHandleBase(const ShareHandleBase &) {
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handleCount = 0;
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}
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~ShareHandleBase() {}
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void addRef() {
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++handleCount;
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}
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int decrRef() {
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return --handleCount;
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}
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int numRef() const {
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return handleCount;
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}
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private:
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mutable int handleCount;
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};
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} // namespace QDEngine
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#endif // QDENGINE_QDCORE_UTIL_HANDLE_H
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