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50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
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// -*- C++ -*-
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/**
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* \file signals.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Guillaume Munch
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*
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* Full author contact details are available in file CREDITS.
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*/
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#ifndef LYX_SIGNALS_H
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#define LYX_SIGNALS_H
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#include "boost/signals2.hpp"
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#include <memory>
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namespace lyx {
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namespace signals2 = ::boost::signals2;
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namespace support {
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/// A small utility to use with signals2::slot_type::track_foreign when the
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/// parent object is not handled by a shared_ptr, or to track the lifetime of an
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/// object. Using Trackable to track lifetimes is less thread-safe than tracking
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/// their parents directly with a shared_ptr as recommended by signals2, but it
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/// makes it easier for transitioning old code. (Essentially because Trackable
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/// will not prevent the deletion of the parent by a concurrent thread.)
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class Trackable {
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public:
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Trackable() : p_(std::make_shared<int>(0)) {}
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Trackable(Trackable const &) : Trackable() {}
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Trackable(Trackable &&) : Trackable() {}
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Trackable & operator=(Trackable const &) { return *this; }
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Trackable & operator=(Trackable &&) { return *this; }
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// This weak pointer lets you know if the parent object has been destroyed
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std::weak_ptr<void> p() const { return p_; }
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private:
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std::shared_ptr<void> const p_;
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};
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} // namespace support
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} // namespace lyx
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#endif
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