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copied!<p>If you really have to pass <code>Parameter</code> by pointer to your subscribers, then you should use <code>boost::shared_ptr</code>:</p> <pre><code>typedef boost::shared_ptr<Parameter> SharedParameterPtr; typedef boost::signals2::signal< void ( SharedParameterPtr ) > signalParameterChanged_t; signalParameterChanged_t m_signalParameterChanged; // The signal source void Parameter::raiseParameterChangedSignal() { SharedParameterPtr pParameterDeepCopied = new Parameter(*this); m_signalParameterChanged(pParameterDeepCopied); } // The subscriber's handler void ClientGui::onDeviceParameterChangedHandler( SharedParameterPtr pParameter) { cout << pParameter->toString() << endl; } </code></pre> <p>The shared parameter object sent to your subscribers will be automatically deleted when its reference count becomes zero (i.e. it goes out of scope in all the handlers).</p> <p>Is Parameter really so heavyweight that you need to send it to your subscribers via pointer?</p> <p><strong>EDIT:</strong></p> <p>Please note that using shared_ptr takes care of lifetime management, but will not relieve you of the responsibility to make concurrent reads/writes to/from the shared parameter object thread-safe. You may well want to pass-by-copy to your subscribers for thread-safety reasons alone. In your question, it's not clear enough to me what goes on thread-wise, so I can't give you more specific recommendations.</p> <p>Is the thread calling <code>raiseParameterChangedSignal()</code> the same as your GUI thread? Some GUI toolkits don't allow concurrent use of their API by multiple threads.</p>

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