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29 lines
982 B
29 lines
982 B
/**************************************************************************** |
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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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