mirror of https://github.com/ArduPilot/ardupilot
127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
/*
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* Copyright (C) 2015-2016 Intel Corporation. All rights reserved.
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*
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* This file is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* 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 file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <cstddef>
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namespace AP_HAL {
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/* Poor's man std::unique_ptr
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*
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* OwnPtr is a container for a pointer declaring ownership.
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*
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* The goal is to allow to own object, pass it around and automatically delete
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* the pointer when the container goes out of scope.
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*
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* In order to pass it around the move constructor or move assignment operator
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* must be used. operator*, operator-> and the get() method can be used to get
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* the pointer contained in the OwnPtr container.
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*
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* The OwnPtr name comes from similar class in WebKit, before they switched to
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* std::unique_ptr. The implementation is different/simpler. We need our own
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* implementation since the <memory> header (and thus std::unique_ptr) is not
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* compatible with the PX4 toolchain and/or nuttx headers.
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*/
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template<typename T>
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class OwnPtr {
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public:
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OwnPtr() : _ptr(nullptr) { }
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OwnPtr(std::nullptr_t) : _ptr(nullptr) { }
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/* non-copyable */
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OwnPtr(const OwnPtr<T> &other) = delete;
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/* Allow construction from a derived class U */
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template<typename U>
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OwnPtr(OwnPtr<U>&& other) : _ptr(other.leak()) { }
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OwnPtr(T *ptr) : _ptr(ptr) { }
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OwnPtr<T>& operator=(std::nullptr_t) { clear(); return *this; }
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template<typename U>
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OwnPtr<T>& operator=(OwnPtr<U>&& other)
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{
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T *old = _ptr;
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_ptr = other.leak();
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delete old;
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return *this;
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}
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template<typename U>
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OwnPtr<T>& operator=(U *other)
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{
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T *old = _ptr;
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_ptr = other;
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delete old;
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return *this;
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}
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~OwnPtr() { delete _ptr; }
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void clear()
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{
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delete leak();
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}
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T *leak()
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{
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T *old = _ptr;
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_ptr = nullptr;
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return old;
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}
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T *get() const
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{
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return _ptr;
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}
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T& operator*() const { return *_ptr; }
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T *operator->() const { return _ptr; }
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bool operator !() const { return !_ptr; }
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explicit operator bool() const { return _ptr != nullptr; }
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private:
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T *_ptr;
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};
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template<typename T>
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inline bool operator==(T* a, const OwnPtr<T>& b)
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{
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return a == b.get();
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}
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template<typename T>
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inline bool operator==(const OwnPtr<T>& a, T* b)
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{
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return a.get() == b;
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}
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template<typename T>
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inline bool operator!=(T* a, const OwnPtr<T>& b)
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{
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return a != b.get();
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}
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template<typename T>
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inline bool operator!=(const OwnPtr<T>& a, T* b)
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{
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return a.get() != b;
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}
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}
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