| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>Frequently Asked Questions</title> |
| <link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> |
| <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> |
| <link rel="up" href="../signals2.html" title="Chapter 19. Boost.Signals2"> |
| <link rel="prev" href="thread-safety.html" title="Thread-Safety"> |
| <link rel="next" href="rationale.html" title="Design Rationale"> |
| </head> |
| <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> |
| <table cellpadding="2" width="100%"><tr> |
| <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> |
| <td align="center"><a href="../../../index.html">Home</a></td> |
| <td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> |
| <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> |
| <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> |
| <td align="center"><a href="../../../more/index.htm">More</a></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="thread-safety.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../signals2.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="rationale.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="signals2.faq"></a>Frequently Asked Questions</h2></div></div></div> |
| <div class="qandaset"> |
| <a name="id2565211"></a><dl> |
| <dt>1. <a href="faq.html#id2565213">Don't noncopyable signal semantics mean that a class |
| with a signal member will be noncopyable as well?</a> |
| </dt> |
| <dt>2. <a href="faq.html#id2565236">Is Boost.Signals2 thread-safe?</a> |
| </dt> |
| </dl> |
| <table border="0" width="100%" summary="Q and A Set"> |
| <col align="left" width="1%"> |
| <col> |
| <tbody> |
| <tr class="question"> |
| <td align="left" valign="top"> |
| <a name="id2565213"></a><a name="id2565215"></a><p><b>1.</b></p> |
| </td> |
| <td align="left" valign="top"><p>Don't noncopyable signal semantics mean that a class |
| with a signal member will be noncopyable as well?</p></td> |
| </tr> |
| <tr class="answer"> |
| <td align="left" valign="top"></td> |
| <td align="left" valign="top"><p>No. The compiler will not be able to generate a copy |
| constructor or copy assignment operator for your class if it |
| has a signal as a member, but you are free to write your own |
| copy constructor and/or copy assignment operator. Just don't |
| try to copy the signal.</p></td> |
| </tr> |
| <tr class="question"> |
| <td align="left" valign="top"> |
| <a name="id2565236"></a><a name="id2565238"></a><p><b>2.</b></p> |
| </td> |
| <td align="left" valign="top"><p>Is Boost.Signals2 thread-safe?</p></td> |
| </tr> |
| <tr class="answer"> |
| <td align="left" valign="top"></td> |
| <td align="left" valign="top"> |
| <p> |
| Yes, as long as the Mutex template parameter is not set to |
| 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>. |
| Also, if your slots depend on objects which may be destroyed concurrently |
| with signal invocation, you will need to use automatic connection management. |
| That is, the objects will need to be owned by |
| <code class="computeroutput">shared_ptr</code> and passed to the slot's |
| <code class="computeroutput"><a class="link" href="../boost/signals2/slot.html#id607569-bb">track</a></code>() method before the slot is connected. |
| The <code class="computeroutput"><a class="link" href="../boost/signals2/trackable.html" title="Class trackable">signals2::trackable</a></code> scheme of automatic connection management |
| is NOT thread-safe, and is only provided to ease porting of single-threaded |
| code from Boost.Signals to Boost.Signals2. |
| </p> |
| <p>See the documentation section on <a class="link" href="thread-safety.html" title="Thread-Safety">thread-safety</a> |
| for more information. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"><p><small>Last revised: June 12, 2007 at 14:01:23 -0400</small></p></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2001-2004 Douglas Gregor<br>Copyright © 2007-2009 Frank Mori Hess<p>Distributed under the Boost |
| Software License, Version 1.0. (See accompanying file |
| <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> |
| </div></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="thread-safety.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../signals2.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="rationale.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |
