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<title>Class template last_value</title>
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<div class="refentry" title="Class template last_value">
<a name="boost.signals2.last_value"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class template last_value</span></h2>
<p>boost::signals2::last_value — Evaluate an <a class="link" href="../../InputIterator.html" title="Concept InputIterator">InputIterator</a> sequence and return the
last value in the sequence.</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: <<a class="link" href="../../signals2/reference.html#header.boost.signals2.last_value_hpp" title="Header <boost/signals2/last_value.hpp>">boost/signals2/last_value.hpp</a>>
</em></span><span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T>
<span class="bold"><strong>class</strong></span> <a class="link" href="last_value.html" title="Class template last_value">last_value</a> {
<span class="bold"><strong>public</strong></span>:
<span class="emphasis"><em>// types</em></span>
<span class="bold"><strong>typedef</strong></span> T <a name="boost.signals2.last_value.result_type"></a>result_type;
<span class="emphasis"><em>// <a class="link" href="last_value.html#id626550-bb">invocation</a></em></span>
<span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> <a class="link" href="../../InputIterator.html" title="Concept InputIterator">InputIterator</a>>
<span class="type">result_type</span> <a class="link" href="last_value.html#id644753-bb"><span class="bold"><strong>operator</strong></span>()</a>(InputIterator, InputIterator) <span class="bold"><strong>const</strong></span>;
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1703608"></a><h2>Description</h2>
<p>
The <code class="computeroutput">last_value</code> class was the default <code class="computeroutput">Combiner</code> template parameter
type for signals in the original Signals library.
Signals2 uses <a class="link" href="optional_last_value.html" title="Class template optional_last_value">optional_last_value</a> as the default, which
does not throw.
</p>
<div class="refsect2" title="last_value invocation">
<a name="id1703640"></a><h3>
<a name="id626550-bb"></a><code class="computeroutput">last_value</code> invocation</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> <a class="link" href="../../InputIterator.html" title="Concept InputIterator">InputIterator</a>>
<span class="type">result_type</span> <a name="id644753-bb"></a><span class="bold"><strong>operator</strong></span>()(InputIterator first, InputIterator last) <span class="bold"><strong>const</strong></span>;</pre>
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<td><p><span class="term">Effects:</span></p></td>
<td><p>Attempts to dereference every iterator in the sequence <code class="computeroutput">[first, last)</code>.
</p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>The result of the last successful iterator dereference.</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td><p><a class="link" href="no_slots_error.html" title="Class no_slots_error">no_slots_error</a> if no iterators were successfully dereferenced,
unless the template type of <code class="computeroutput">last_value</code> is <code class="computeroutput">void</code>.</p></td>
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<div class="refsect2" title="Specializations">
<a name="id1703756"></a><h3>Specializations</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><a class="link" href="last_value_void_id1147320.html" title="Class last_value<void>">Class last_value<void></a></p></li></ul></div>
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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
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>
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