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Finished Techniques page, added links to it.

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[SVN r17380]
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Peter Dimov
2003-02-13 19:07:20 +00:00
parent d7c841484a
commit 300f8f7b9a
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<A href="#Handle/Body">Handle/Body Idiom</A><br>
<A href="#ThreadSafety">Thread Safety</A><br>
<A href="#FAQ">Frequently Asked Questions</A><br>
<A href="smarttests.htm">Smart Pointer Timings</A></p>
<A href="smarttests.htm">Smart Pointer Timings</A><br>
<A href="sp_techniques.html">Programming Techniques</A></p>
<h2><a name="Introduction">Introduction</a></h2>
<p>The <b>shared_ptr</b> class template stores a pointer to a dynamically allocated
object, typically with a C++ <EM>new-expression</EM> . The object pointed to is
@ -390,8 +391,8 @@ q = p;
many of the implicit conversion pitfalls.</P>
</blockquote>
<P><EM>[The conversion to bool is not merely syntactic sugar. It allows <STRONG>shared_ptr</STRONG>s
to be declared in conditions when using <A href="#dynamic_pointer_cast">dynamic_pointer_cast</A> or
<A href="weak_ptr.htm#lock">weak_ptr::lock</A>.]</EM></P>
to be declared in conditions when using <A href="#dynamic_pointer_cast">dynamic_pointer_cast</A>
or <A href="weak_ptr.htm#lock">weak_ptr::lock</A>.]</EM></P>
<h3><a name="swap">swap</a></h3>
<pre>void swap(shared_ptr &amp; b); // never throws</pre>
<blockquote>

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versions of the smart pointer implementation.</p>
<p>A page on <a href="smarttests.htm">smart pointer timings</a> will be of interest
to those curious about performance issues.</p>
<P>A page on <A href="sp_techniques.html">smart pointer programming techniques</A> lists
some advanced applications of <code>shared_ptr</code> and <code>weak_ptr</code>.</P>
<h2><a name="common_requirements">Common Requirements</a></h2>
<p>These smart pointer class templates have a template parameter, <b>T</b>, which
specifies the type of the object pointed to by the smart pointer. The behavior

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Smart pointer programming techniques</title>
<title>Smart Pointer Programming Techniques</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body text="#000000" bgColor="#ffffff">
<h1><IMG height="86" alt="c++boost.gif (8819 bytes)" src="../../c++boost.gif" width="277" align="middle">Smart
pointer programming techniques</h1>
Pointer Programming Techniques</h1>
<p><A href="#incomplete">Using incomplete classes for implementation hiding</A><br>
<A href="#pimpl">The "Pimpl" idiom</A><br>
<A href="#abstract">Using abstract classes for implementation hiding</A><br>
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<p>Note that <code>shared_lock</code> is not templated on the mutex type, thanks to <code>
shared_ptr&lt;void&gt;</code>'s ability to hide type information.</p>
<h2><A name="wrapper">Using <code>shared_ptr</code> to wrap member function calls</A></h2>
<p>[http://www.research.att.com/~bs/wrapper.pdf]</p>
<p><code>shared_ptr</code> implements the ownership semantics required from the <code>Wrap</code>/<code>CallProxy</code>
scheme described in Bjarne Stroustrup's article "Wrapping C++ Member Function
Calls" (available online at <A href="http://www.research.att.com/~bs/wrapper.pdf">http://www.research.att.com/~bs/wrapper.pdf</A>).
An implementation is given below:</p>
<pre>template&lt;class T&gt; class pointer
{
private:
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shared_ptr&lt;T&gt; operator-&gt;() const
{
p_-&gt;prefix();
return shared_ptr&lt;T&gt;(p_, mem_fn(&amp;T::suffix));
return shared_ptr&lt;T&gt;(p_, <A href="../bind/mem_fn.html" >mem_fn</A>(&amp;T::suffix));
}
};