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-<html>
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-<title>Function get</title>
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-<a name="boost.get_id1673528"></a><div class="titlepage"></div>
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-<h2><span class="refentrytitle">Function get</span></h2>
-<p>boost::get &#8212; Retrieves a value of a specified type from a given
- <code class="computeroutput"><a class="link" href="variant.html" title="Class template variant">variant</a></code>.</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="comment">// In header: &lt;<a class="link" href="../variant/reference.html#header.boost.variant.get_hpp" title="Header &lt;boost/variant/get.hpp&gt;">boost/variant/get.hpp</a>&gt;
-
-</span>
-<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">,</span> <span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">&gt;</span>
- <span class="identifier">U</span> <span class="special">*</span> <span class="identifier">get</span><span class="special">(</span><a class="link" href="variant.html" title="Class template variant">variant</a><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">&gt;</span> <span class="special">*</span> operand<span class="special">)</span><span class="special">;</span>
-<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">,</span> <span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">&gt;</span>
- <span class="keyword">const</span> <span class="identifier">U</span> <span class="special">*</span> <span class="identifier">get</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="variant.html" title="Class template variant">variant</a><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">&gt;</span> <span class="special">*</span> operand<span class="special">)</span><span class="special">;</span>
-<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">,</span> <span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">&gt;</span>
- <span class="identifier">U</span> <span class="special">&amp;</span> <span class="identifier">get</span><span class="special">(</span><a class="link" href="variant.html" title="Class template variant">variant</a><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">&gt;</span> <span class="special">&amp;</span> operand<span class="special">)</span><span class="special">;</span>
-<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">,</span> <span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">&gt;</span>
- <span class="keyword">const</span> <span class="identifier">U</span> <span class="special">&amp;</span> <span class="identifier">get</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="variant.html" title="Class template variant">variant</a><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">&gt;</span> <span class="special">&amp;</span> operand<span class="special">)</span><span class="special">;</span></pre></div>
-<div class="refsect1">
-<a name="id3711087"></a><h2>Description</h2>
-<p>The <code class="computeroutput">get</code> function allows run-time checked,
- type-safe retrieval of the content of the given
- <code class="computeroutput"><a class="link" href="variant.html" title="Class template variant">variant</a></code>. The function succeeds
- only if the content is of the specified type <code class="computeroutput">U</code>, with
- failure indicated as described below.</p>
-<p><span class="bold"><strong>Warning</strong></span>: After either
- <code class="computeroutput">operand</code> or its content is destroyed (e.g., when the
- given <code class="computeroutput"><a class="link" href="variant.html" title="Class template variant">variant</a></code> is assigned a
- value of different type), the returned reference is invalidated.
- Thus, significant care and caution must be extended when handling
- the returned reference.</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term">Notes:</span></p></td>
-<td>As part of its guarantee of type-safety, <code class="computeroutput">get</code>
- enforces <code class="computeroutput">const</code>-correctness. Thus, the specified type
- <code class="computeroutput">U</code> must be <code class="computeroutput">const</code>-qualified whenever
- <code class="computeroutput">operand</code> or its content is likewise
- <code class="computeroutput">const</code>-qualified. The converse, however, is not required:
- that is, the specified type <code class="computeroutput">U</code> may be
- <code class="computeroutput">const</code>-qualified even when <code class="computeroutput">operand</code> and its
- content are not.</td>
-</tr>
-<tr>
-<td><p><span class="term">Returns:</span></p></td>
-<td>If passed a pointer, <code class="computeroutput">get</code> returns a pointer to
- the value content if it is of the specified type <code class="computeroutput">U</code>;
- otherwise, a null pointer is returned. If passed a reference,
- <code class="computeroutput">get</code> returns a reference to the value content if it is of
- the specified type <code class="computeroutput">U</code>; otherwise, an exception is thrown
- (see below).</td>
-</tr>
-<tr>
-<td><p><span class="term">Throws:</span></p></td>
-<td>Overloads taking a
- <code class="computeroutput"><a class="link" href="variant.html" title="Class template variant">variant</a></code> pointer will not
- throw; the overloads taking a
- <code class="computeroutput"><a class="link" href="variant.html" title="Class template variant">variant</a></code> reference throw
- <code class="computeroutput"><a class="link" href="bad_get.html" title="Class bad_get">bad_get</a></code> if the content is not of
- the specified type <code class="computeroutput">U</code>.</td>
-</tr>
-<tr>
-<td><p><span class="term">Rationale:</span></p></td>
-<td>While visitation via
- <code class="computeroutput"><a class="link" href="apply_visitor.html" title="Function apply_visitor">apply_visitor</a></code>
- is generally preferred due to its greater safety, <code class="computeroutput">get</code> may
- may be more convenient in some cases due to its straightforward
- usage.</td>
-</tr>
-</tbody>
-</table></div>
-</div>
-</div>
-<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright &#169; 2002, 2003 Eric Friedman, Itay Maman<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>
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