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101 lines
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="signals2.faq"></a>Frequently Asked Questions</h2></div></div></div>
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<div class="qandaset">
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<a name="id-1.3.37.8.2"></a><dl>
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<dt>1. <a href="faq.html#id-1.3.37.8.2.1">Don't noncopyable signal semantics mean that a class
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with a signal member will be noncopyable as well?</a>
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</dt>
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<dt>2. <a href="faq.html#id-1.3.37.8.2.2">Is Boost.Signals2 thread-safe?</a>
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<a name="id-1.3.37.8.2.1"></a><a name="id-1.3.37.8.2.1.1"></a><p><b>1.</b></p>
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</td>
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<td align="left" valign="top"><p>Don't noncopyable signal semantics mean that a class
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with a signal member will be noncopyable as well?</p></td>
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</tr>
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<tr class="answer">
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<td align="left" valign="top"></td>
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<td align="left" valign="top"><p>No. The compiler will not be able to generate a copy
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constructor or copy assignment operator for your class if it
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has a signal as a member, but you are free to write your own
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copy constructor and/or copy assignment operator. Just don't
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try to copy the signal.</p></td>
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<tr class="question">
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<td align="left" valign="top">
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<a name="id-1.3.37.8.2.2"></a><a name="id-1.3.37.8.2.2.1"></a><p><b>2.</b></p>
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</td>
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<td align="left" valign="top"><p>Is Boost.Signals2 thread-safe?</p></td>
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</tr>
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<tr class="answer">
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<td align="left" valign="top"></td>
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<td align="left" valign="top">
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<p>
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Yes, as long as the Mutex template parameter is not set to
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a fake mutex type like <code class="computeroutput"><a class="link" href="../boost/signals2/dummy_mutex.html" title="Class dummy_mutex">boost::signals2::dummy_mutex</a></code>.
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Also, if your slots depend on objects which may be destroyed concurrently
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with signal invocation, you will need to use automatic connection management.
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That is, the objects will need to be owned by
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<code class="computeroutput"><a class="link" href="../boost/shared_ptr.html" title="Class template shared_ptr">shared_ptr</a></code> and passed to the slot's
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<code class="computeroutput"><a class="link" href="../boost/signals2/slot.html#id-1_3_37_6_12_5_1_1_17_1-bb">track</a></code>() method before the slot is connected.
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The <code class="computeroutput"><a class="link" href="../boost/signals2/trackable.html" title="Class trackable">signals2::trackable</a></code> scheme of automatic connection management
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is NOT thread-safe, and is only provided to ease porting of single-threaded
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code from Boost.Signals to Boost.Signals2.
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</p>
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<p>See the documentation section on <a class="link" href="thread-safety.html" title="Thread-Safety">thread-safety</a>
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for more information.
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</p>
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</td>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"><p><small>Last revised: June 12, 2007 at 14:01:23 -0400</small></p></td>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2004 Douglas Gregor<br>Copyright © 2007-2009 Frank Mori Hess<p>Distributed under the Boost
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Software License, Version 1.0. (See accompanying file
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<code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p>
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