134 lines
2.8 KiB
C++
134 lines
2.8 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 TETRAEDGE_TE_TE_INTRUSIVE_PTR_H
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#define TETRAEDGE_TE_TE_INTRUSIVE_PTR_H
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namespace Tetraedge {
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/**
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Like the boost intrusive pointer. To be used with an
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object inheriting from TeReferencesCounter
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*/
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template<class T> class TeIntrusivePtr {
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public:
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// NOTE: The original uses a member function for this, which is cleaner, but
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// MSVC compiles member functions for different class types (forward
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// declaration, multi-inheritance, etc) as different sizes which causes all
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// sorts of issues. Only accept a static function to avoid such problems.
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typedef void(*Tdestructor)(T *obj);
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TeIntrusivePtr() : _p(nullptr), _deleteFn(nullptr) {}
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TeIntrusivePtr(const TeIntrusivePtr<T> &other) : _deleteFn(nullptr) {
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_p = other._p;
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if (_p)
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_p->incrementCounter();
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}
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TeIntrusivePtr(T *obj) : _deleteFn(nullptr) {
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_p = obj;
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if (_p)
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_p->incrementCounter();
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}
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virtual ~TeIntrusivePtr() {
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release();
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}
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TeIntrusivePtr<T> &operator=(T *obj) {
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if (_p != obj) {
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release();
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_p = obj;
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if (_p)
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_p->incrementCounter();
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}
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return *this;
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}
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TeIntrusivePtr<T> &operator=(const TeIntrusivePtr<T> &other) {
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if (this != &other) {
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release();
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_p = other._p;
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_deleteFn = other._deleteFn;
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if (_p)
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_p->incrementCounter();
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}
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return *this;
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}
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void release() {
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if (_p) {
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if (_p->decrementCounter()) {
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if (_deleteFn)
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(_deleteFn)(_p);
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else
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delete _p;
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}
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}
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_p = nullptr;
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}
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bool operator==(const TeIntrusivePtr<T> &other) const {
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return (this == &other || _p == other._p);
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}
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T *get() {
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return _p;
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}
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const T *get() const {
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return _p;
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}
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T &operator*() {
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return *_p;
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}
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const T &operator*() const {
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return *_p;
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}
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operator bool() const {
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return _p != nullptr;
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}
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T *operator->() {
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return _p;
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}
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const T *operator->() const {
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return _p;
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}
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void setDeleteFn(Tdestructor destructor) {
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_deleteFn = destructor;
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}
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private:
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T *_p;
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Tdestructor _deleteFn;
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};
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} // end namespace Tetraedge
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#endif // TETRAEDGE_TE_TE_INTRUSIVE_PTR_H
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