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30 lines
982 B
30 lines
982 B
7 years ago
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/****************************************************************************
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*
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* (c) 2017 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
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*
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* QGroundControl is licensed according to the terms in the file
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* COPYING.md in the root of the source code directory.
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*
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****************************************************************************/
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#pragma once
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#include <memory>
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//-----------------------------------------------------------------------------
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/**
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* @class LifetimeChecker
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* Base class which helps to check if an object instance still exists.
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* A subclass can take a weak pointer from _instance and then check if the object was deleted.
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* This is used in callbacks that access 'this', but the instance might already be deleted (e.g. vehicle disconnect).
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*/
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class LifetimeChecker
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{
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public:
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LifetimeChecker() : _instance(this, [](void*){}) { }
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virtual ~LifetimeChecker() = default;
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protected:
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std::shared_ptr<LifetimeChecker> _instance;
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};
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