55 lines
2.3 KiB
XML
55 lines
2.3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
|
|
<!DOCTYPE section PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
|
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd">
|
|
<!--
|
|
Copyright Douglas Gregor 2001-2004
|
|
Copyright Frank Mori Hess 2007-2009
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
-->
|
|
<section last-revision="$Date: 2007-06-12 14:01:23 -0400 (Tue, 12 Jun 2007) $" id="signals2.faq">
|
|
<title>Frequently Asked Questions</title>
|
|
|
|
<using-namespace name="boost::signals2"/>
|
|
<using-namespace name="boost"/>
|
|
|
|
<qandaset>
|
|
<qandaentry>
|
|
<question>
|
|
<para>Don't noncopyable signal semantics mean that a class
|
|
with a signal member will be noncopyable as well?</para>
|
|
</question>
|
|
<answer>
|
|
<para>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.</para>
|
|
</answer>
|
|
</qandaentry>
|
|
<qandaentry>
|
|
<question>
|
|
<para>Is Boost.Signals2 thread-safe?</para>
|
|
</question>
|
|
<answer>
|
|
<para>
|
|
Yes, as long as the Mutex template parameter is not set to
|
|
a fake mutex type like <classname>boost::signals2::dummy_mutex</classname>.
|
|
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
|
|
<classname>shared_ptr</classname> and passed to the slot's
|
|
<methodname alt="signals2::slot::track">track</methodname>() method before the slot is connected.
|
|
The <classname>signals2::trackable</classname> 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.
|
|
</para>
|
|
<para>See the documentation section on <link linkend="signals2.thread-safety">thread-safety</link>
|
|
for more information.
|
|
</para>
|
|
</answer>
|
|
</qandaentry>
|
|
</qandaset>
|
|
</section>
|