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<div class="headertitle"><div class="title">cxx::Weak_ref&lt; T &gt; Class Template Reference</div></div>
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<p>Typed weak reference to an object of type <span class="tt">T</span>.
<a href="#details">More...</a></p>
<p><code>#include &lt;<a class="el" href="weak__ref_source.html">weak_ref</a>&gt;</code></p>
<div id="dynsection-0" onclick="return dynsection.toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;"><span class="dynarrow"><span class="arrowhead closed"></span></span>Inheritance diagram for cxx::Weak_ref&lt; T &gt;:</div>
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<div class="center"><iframe scrolling="no" loading="lazy" frameborder="0" src="classcxx_1_1Weak__ref__inherit__graph.svg" width="220" height="511"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe></div>
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<div id="dynsection-1" onclick="return dynsection.toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;"><span class="dynarrow"><span class="arrowhead closed"></span></span>Collaboration diagram for cxx::Weak_ref&lt; T &gt;:</div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-inherited" class="groupheader"><a id="inherited" name="inherited"></a>
Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pub_methods_classcxx_1_1H__list__item__t"><td colspan="2" onclick="javascript:dynsection.toggleInherit('pub_methods_classcxx_1_1H__list__item__t')"><span class="dynarrow"><span class="arrowhead closed"></span></span>Public Member Functions inherited from <a class="el" href="classcxx_1_1H__list__item__t.html">cxx::H_list_item_t&lt; Weak_ref_base &gt;</a></td></tr>
<tr class="memitem:a386713e30171daa23a74e55ccd294382 inherit pub_methods_classcxx_1_1H__list__item__t" id="r_a386713e30171daa23a74e55ccd294382"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classcxx_1_1H__list__item__t.html#a386713e30171daa23a74e55ccd294382">H_list_item_t</a> ()</td></tr>
<tr class="memdesc:a386713e30171daa23a74e55ccd294382 inherit pub_methods_classcxx_1_1H__list__item__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">Constructor. <br /></td></tr>
<tr class="memitem:a4d7651de09d0ed046db094adca054859 inherit pub_methods_classcxx_1_1H__list__item__t" id="r_a4d7651de09d0ed046db094adca054859"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classcxx_1_1H__list__item__t.html#a4d7651de09d0ed046db094adca054859">~H_list_item_t</a> () noexcept</td></tr>
<tr class="memdesc:a4d7651de09d0ed046db094adca054859 inherit pub_methods_classcxx_1_1H__list__item__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destructor. <br /></td></tr>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><div class="compoundTemplParams">template&lt;typename T&gt;<br />
class cxx::Weak_ref&lt; T &gt;</div><p>Typed weak reference to an object of type <span class="tt">T</span>. </p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">T</td><td>The type of the referenced object.</td></tr>
</table>
</dd>
</dl>
<p>A weak reference is a reference that is invalidated when the referenced object is about to be deleted. All weak references to an object are kept in a linked list (see <a class="el" href="structcxx_1_1Weak__ref__base_1_1List.html" title="The list type for keeping all weak references to an object.">Weak_ref_base::List</a>) and all the weak references are iterated and reset by the <a class="el" href="structcxx_1_1Weak__ref__base_1_1List.html" title="The list type for keeping all weak references to an object.">Weak_ref_base::List</a> destructor or Weak_ref_base::List::reset().</p>
<p>The type <span class="tt">T</span> must provide two methods that handle the housekeeping of weak references: <span class="tt">remove_weak_ref(Weak_ref_base *)</span> and <span class="tt">add_weak_ref(Weak_ref_base *)</span>. These functions must handle the insertion and removal of the weak reference into the respective <a class="el" href="structcxx_1_1Weak__ref__base_1_1List.html" title="The list type for keeping all weak references to an object.">Weak_ref_base::List</a> object. For convenience one can use the cxx::Weak_ref_obj as a base class that handles weak references for you.</p>
<p>For example: </p><div class="fragment"><div class="line"><span class="keyword">class </span>C : <span class="keyword">public</span> cxx::Weak_ref_obj {};</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main()</div>
<div class="line">{</div>
<div class="line"> <a class="code hl_class" href="classcxx_1_1Weak__ref.html">cxx::Weak_ref&lt;C&gt;</a> r; <span class="comment">// r is nullptr</span></div>
<div class="line"> {</div>
<div class="line"> C c;</div>
<div class="line"> r = &amp;c; <span class="comment">// now r points to c</span></div>
<div class="line"> } <span class="comment">// c is destructed, which implies resetting all weak references to c</span></div>
<div class="line"> <span class="comment">// now r is nullptr</span></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="ttc" id="aclasscxx_1_1Weak__ref_html"><div class="ttname"><a href="classcxx_1_1Weak__ref.html">cxx::Weak_ref</a></div><div class="ttdoc">Typed weak reference to an object of type T.</div><div class="ttdef"><b>Definition</b> <a href="weak__ref_source.html#l00095">weak_ref:96</a></div></div>
</div><!-- fragment --><dl class="section note"><dt>Note</dt><dd>Weak references have no effect on the lifetime of the referenced object. Hence, a referenced object is <em>not</em> deleted when all weak references for it are gone. If automatic deletion is needed, see <a class="el" href="classcxx_1_1Ref__ptr.html" title="A reference-counting pointer with automatic cleanup.">cxx::Ref_ptr</a>. </dd></dl>
<p class="definition">Definition at line <a class="el" href="weak__ref_source.html#l00095">95</a> of file <a class="el" href="weak__ref_source.html">weak_ref</a>.</p>
</div><hr/>The documentation for this class was generated from the following file:<ul>
<li>l4/cxx/<a class="el" href="weak__ref_source.html">weak_ref</a></li>
</ul>
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