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<div class="refentry">
<a name="boost.type_erasure.any"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template any</span></h2>
<p>boost::type_erasure::any</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: <<a class="link" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.param_hpp" title="Header <boost/type_erasure/param.hpp>">boost/type_erasure/param.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Concept<span class="special">,</span> <span class="keyword">typename</span> T <span class="special">=</span> <a class="link" href="_self.html" title="Struct _self">_self</a><span class="special">></span>
<span class="keyword">class</span> <a class="link" href="any.html" title="Class template any">any</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// <a class="link" href="any.html#boost.type_erasure.anyconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="any.html#idm45506893379152-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a class="link" href="any.html#idm45506893364352-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="identifier">U</span> <span class="special">&&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">,</span> <span class="keyword">typename</span> Map<span class="special">></span> <a class="link" href="any.html#idm45506890819072-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="identifier">U</span> <span class="special">&&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="static_binding.html" title="Struct template static_binding">static_binding</a><span class="special"><</span> <span class="identifier">Map</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="any.html#idm45506890804144-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Concept2<span class="special">,</span> <span class="keyword">typename</span> Tag2<span class="special">></span>
<a class="link" href="any.html#idm45506890797984-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a><span class="special"><</span> <span class="identifier">Concept2</span><span class="special">,</span> <span class="identifier">Tag2</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Concept2<span class="special">,</span> <span class="keyword">typename</span> Tag2<span class="special">,</span> <span class="keyword">typename</span> Map<span class="special">></span>
<a class="link" href="any.html#idm45506890787872-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a><span class="special"><</span> <span class="identifier">Concept2</span><span class="special">,</span> <span class="identifier">Tag2</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="static_binding.html" title="Struct template static_binding">static_binding</a><span class="special"><</span> <span class="identifier">Map</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Concept2<span class="special">,</span> <span class="keyword">typename</span> Tag2<span class="special">></span>
<a class="link" href="any.html#idm45506890775776-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a><span class="special"><</span> <span class="identifier">Concept2</span><span class="special">,</span> <span class="identifier">Tag2</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="binding.html" title="Class template binding">binding</a><span class="special"><</span> <span class="identifier">Concept</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...</span> U<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="any.html#idm45506894485008-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="identifier">U</span> <span class="special">&&</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...</span> U<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="any.html#idm45506894476128-bb"><span class="identifier">any</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="binding.html" title="Class template binding">binding</a><span class="special"><</span> <span class="identifier">Concept</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">&&</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="../any.html" title="Class any">any</a> <span class="special">&</span> <a class="link" href="any.html#idm45506894466640-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a class="link" href="../any.html" title="Class any">any</a> <span class="special">&</span> <a class="link" href="any.html#idm45506894459040-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">U</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="any.html#idm45506894451040-bb"><span class="special">~</span><span class="identifier">any</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555076940672"></a><h2>Description</h2>
<p>The class template <a class="link" href="any.html" title="Class template any">any</a> can store any object that models a specific <a class="link" href="../../boost_typeerasure/conceptdef.html" title="Concept Definitions">Concept</a>. It dispatches all the functions defined by the <a class="link" href="../../boost_typeerasure/conceptdef.html" title="Concept Definitions">Concept</a> to the contained type at runtime.</p>
<p>
</p>
<p><span class="bold"><strong>See Also:</strong></span></p>
<p><a class="link" href="concept_of.html" title="Struct template concept_of">concept_of</a>, <a class="link" href="placeholder_of.html" title="Struct template placeholder_of">placeholder_of</a>, <a class="link" href="any_cast_idm45506900398752.html" title="Function any_cast">any_cast</a>, <a class="link" href="is_empty.html" title="Function template is_empty">is_empty</a>, <a class="link" href="binding_of.html" title="Function template binding_of">binding_of</a>, <a class="link" href="typeid_of.html" title="Function typeid_of">typeid_of</a> </p>
<p>
</p>
<div class="refsect2">
<a name="idm45555076930912"></a><h3>Template Parameters</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">typename</span> Concept</pre>
<p>The <a class="link" href="../../boost_typeerasure/conceptdef.html" title="Concept Definitions">Concept</a> that the stored type should model. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">typename</span> T <span class="special">=</span> <a class="link" href="_self.html" title="Struct _self">_self</a></pre>
<p>A <code class="computeroutput"><a class="link" href="placeholder.html" title="Struct placeholder">placeholder</a></code> specifying which type this is.</p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555076922288"></a><h3>
<a name="boost.type_erasure.anyconstruct-copy-destruct"></a><code class="computeroutput">any</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idm45506893379152-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an empty <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>.</p>
<p>Except as otherwise noted, all operations on an empty <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> result in a <code class="computeroutput"><a class="link" href="bad_function_call.html" title="Class bad_function_call">bad_function_call</a></code> exception. The copy-constructor of an empty <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> creates another null <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>. The destructor of an empty <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> is a no-op. Comparison operators treat all empty <code class="computeroutput"><a class="link" href="any.html" title="Class template any">anys</a></code> as equal. <code class="computeroutput"><a class="link" href="typeid_of.html" title="Function typeid_of">typeid_of</a></code> applied to an empty <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> returns <code class="computeroutput">typeid(void)</code>.</p>
<p>An <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> which does not include <code class="computeroutput"><a class="link" href="relaxed.html" title="Struct relaxed">relaxed</a></code> in its <a class="link" href="../../boost_typeerasure/conceptdef.html" title="Concept Definitions">Concept</a> can never be null.</p>
<p>
</p>
<p><span class="bold"><strong>See Also:</strong></span></p>
<p> <code class="computeroutput"><a class="link" href="is_empty.html" title="Function template is_empty">is_empty</a></code> </p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><a class="link" href="relaxed.html" title="Struct relaxed">relaxed</a> must be in <code class="computeroutput">Concept</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Nothing. </td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a name="idm45506893364352-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="identifier">U</span> <span class="special">&&</span> data<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> to hold a copy of <code class="computeroutput">data</code>. The <code class="computeroutput">Concept</code> will be instantiated with the placeholder <code class="computeroutput">T</code> bound to U.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>This constructor never matches if the argument is an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>, <code class="computeroutput"><a class="link" href="binding.html" title="Class template binding">binding</a></code>, or <code class="computeroutput"><a class="link" href="static_binding.html" title="Struct template static_binding">static_binding</a></code>. </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">data</code></span></p></td>
<td><p>The object to store in the <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>.</p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">U</code> is a model of <code class="computeroutput">Concept</code>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">U</code> must be <a href="../../../../doc/html/CopyConstructible.html" target="_top">CopyConstructible</a>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> must not refer to any non-deduced placeholder besides <code class="computeroutput">T</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc or whatever that the copy constructor of <code class="computeroutput">U</code> throws.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">,</span> <span class="keyword">typename</span> Map<span class="special">></span>
<a name="idm45506890819072-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="identifier">U</span> <span class="special">&&</span> data<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="static_binding.html" title="Struct template static_binding">static_binding</a><span class="special"><</span> <span class="identifier">Map</span> <span class="special">></span> <span class="special">&</span> binding<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> to hold a copy of <code class="computeroutput">data</code> with explicitly specified placeholder bindings.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>This constructor never matches if the argument is an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>. </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><code class="computeroutput">binding</code></span></p></td>
<td><p>Specifies the types that all the placeholders should bind to.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">data</code></span></p></td>
<td><p>The object to store in the <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>. </p></td>
</tr>
</tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">U</code> is a model of <code class="computeroutput">Concept</code>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">U</code> must be <a href="../../../../doc/html/CopyConstructible.html" target="_top">CopyConstructible</a>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Map</code> is an MPL map with an entry for every non-deduced placeholder referred to by <code class="computeroutput">Concept</code>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput"><code class="computeroutput">T</code> must</code> map to <code class="computeroutput">U</code> in <code class="computeroutput">Map</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc or whatever that the copy constructor of <code class="computeroutput">U</code> throws.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idm45506890804144-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>Copies an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>.</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">other</code></span></p></td>
<td><p>The object to make a copy of.</p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> must contain <a class="link" href="constructible.html" title="Struct template constructible">constructible<T(const T&)></a>. (This is included in <a class="link" href="copy_constructible.html" title="Struct template copy_constructible">copy_constructible<T></a>)</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc or whatever that the copy constructor of the contained type throws. </td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Concept2<span class="special">,</span> <span class="keyword">typename</span> Tag2<span class="special">></span>
<a name="idm45506890797984-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a><span class="special"><</span> <span class="identifier">Concept2</span><span class="special">,</span> <span class="identifier">Tag2</span> <span class="special">></span> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>Upcasts from an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> with stricter requirements to an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> with weaker requirements.</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">other</code></span></p></td>
<td><p>The object to make a copy of.</p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> must contain constructible<T(const T&)>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> must not refer to any non-deduced placeholder besides <code class="computeroutput">T</code>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>After substituting <code class="computeroutput">T</code> for <code class="computeroutput">Tag2</code>, the requirements of <code class="computeroutput">Concept2</code> must be a superset of the requirements of <code class="computeroutput">Concept</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc or whatever that the copy constructor of the contained type throws. </td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Concept2<span class="special">,</span> <span class="keyword">typename</span> Tag2<span class="special">,</span> <span class="keyword">typename</span> Map<span class="special">></span>
<a name="idm45506890787872-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a><span class="special"><</span> <span class="identifier">Concept2</span><span class="special">,</span> <span class="identifier">Tag2</span> <span class="special">></span> <span class="special">&</span> other<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="static_binding.html" title="Struct template static_binding">static_binding</a><span class="special"><</span> <span class="identifier">Map</span> <span class="special">></span> <span class="special">&</span> binding<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> from another <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>.</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><code class="computeroutput">binding</code></span></p></td>
<td><p>Specifies the mapping between the placeholders used by the two concepts.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">other</code></span></p></td>
<td><p>The object to make a copy of. </p></td>
</tr>
</tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> must contain constructible<T(const T&)>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Map</code> must be an MPL map with keys for all the non-deduced placeholders used by <code class="computeroutput">Concept</code> and values for the corresponding placeholders in <code class="computeroutput">Concept2</code>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>After substituting placeholders according to <code class="computeroutput">Map</code>, the requirements of <code class="computeroutput">Concept2</code> must be a superset of the requirements of <code class="computeroutput">Concept</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc or whatever that the copy constructor of the contained type throws. </td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Concept2<span class="special">,</span> <span class="keyword">typename</span> Tag2<span class="special">></span>
<a name="idm45506890775776-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a><span class="special"><</span> <span class="identifier">Concept2</span><span class="special">,</span> <span class="identifier">Tag2</span> <span class="special">></span> <span class="special">&</span> other<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="binding.html" title="Class template binding">binding</a><span class="special"><</span> <span class="identifier">Concept</span> <span class="special">></span> <span class="special">&</span> binding<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code> from another <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>.</p>
<p>
</p>
<div class="warning"><table border="0" summary="Warning">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../doc/src/images/warning.png"></td>
<th align="left">Warning</th>
</tr>
<tr><td align="left" valign="top"><p>This constructor is potentially dangerous, as it cannot check at compile time whether the arguments match. </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><code class="computeroutput">binding</code></span></p></td>
<td><p>Specifies the bindings of placeholders to actual types.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">other</code></span></p></td>
<td><p>The object to make a copy of. </p></td>
</tr>
</tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> must contain constructible<T(const T&)>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>The type stored in <code class="computeroutput">other</code> must match the type expected by <code class="computeroutput">binding</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p>binding_of(*this) == <code class="computeroutput">binding</code> </p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc or whatever that the copy constructor of the contained type throws.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...</span> U<span class="special">></span> <span class="keyword">explicit</span> <a name="idm45506894485008-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="identifier">U</span> <span class="special">&&</span><span class="special">...</span> arg<span class="special">)</span><span class="special">;</span></pre>
<p>Calls a constructor of the contained type. The bindings will be deduced from the arguments.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>This constructor is never chosen if any other constructor can be called instead. </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">arg</code></span></p></td>
<td><p>The arguments to be passed to the underlying constructor.</p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> must contain an instance of <a class="link" href="constructible.html" title="Struct template constructible">constructible</a> which can be called with these arguments. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>At least one of the arguments must by an <a class="link" href="any.html" title="Class template any">any</a> with the same <code class="computeroutput">Concept</code> as this. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>The bindings of all the arguments that are <a class="link" href="any.html" title="Class template any">any</a>'s, must be the same.</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc or whatever that the constructor of the contained type throws.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...</span> U<span class="special">></span>
<span class="keyword">explicit</span> <a name="idm45506894476128-bb"></a><span class="identifier">any</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="binding.html" title="Class template binding">binding</a><span class="special"><</span> <span class="identifier">Concept</span> <span class="special">></span> <span class="special">&</span> binding<span class="special">,</span> <span class="identifier">U</span> <span class="special">&&</span><span class="special">...</span> arg<span class="special">)</span><span class="special">;</span></pre>
<p>Calls a constructor of the contained type.</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><code class="computeroutput">arg</code></span></p></td>
<td><p>The arguments to be passed to the underlying constructor.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">binding</code></span></p></td>
<td><p>Specifies the bindings of placeholders to actual types. </p></td>
</tr>
</tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> must contain a matching instance of <a class="link" href="constructible.html" title="Struct template constructible">constructible</a>. </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>The contained type of every argument that is an <a class="link" href="any.html" title="Class template any">any</a>, must be the same as that specified by <code class="computeroutput">binding</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p>binding_of(*this) == <code class="computeroutput">binding</code> </p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc or whatever that the constructor of the contained type throws. </td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="../any.html" title="Class any">any</a> <span class="special">&</span> <a name="idm45506894466640-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>Assigns to an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>.</p>
<p>If an appropriate overload of <code class="computeroutput"><a class="link" href="assignable.html" title="Struct template assignable">assignable</a></code> is not available and <code class="computeroutput"><a class="link" href="relaxed.html" title="Struct relaxed">relaxed</a></code> is in <code class="computeroutput">Concept</code>, falls back on constructing from <code class="computeroutput">other</code>.</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Whatever the assignment operator of the contained type throws. When falling back on construction, throws <code class="computeroutput">std::bad_alloc</code> or whatever the copy constructor of the contained type throws. In this case assignment provides the strong exception guarantee. When calling the assignment operator of the contained type, the exception guarantee is whatever the contained type provides. </td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a class="link" href="../any.html" title="Class any">any</a> <span class="special">&</span> <a name="idm45506894459040-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">U</span> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>Assigns to an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>.</p>
<p>If an appropriate overload of <code class="computeroutput"><a class="link" href="assignable.html" title="Struct template assignable">assignable</a></code> is not available and <code class="computeroutput"><a class="link" href="relaxed.html" title="Struct relaxed">relaxed</a></code> is in <code class="computeroutput">Concept</code>, falls back on constructing from <code class="computeroutput">other</code>.</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Whatever the assignment operator of the contained type throws. When falling back on construction, throws <code class="computeroutput">std::bad_alloc</code> or whatever the copy constructor of the contained type throws. In this case assignment provides the strong exception guarantee. When calling an assignment operator of the contained type, the exception guarantee is whatever the contained type provides. </td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idm45506894451040-bb"></a><span class="special">~</span><span class="identifier">any</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><code class="computeroutput">Concept</code> includes <a class="link" href="destructible.html" title="Struct template destructible">destructible<T></a>. </p></td>
</tr></tbody>
</table></div>
</li>
</ol></div>
</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 © 2011-2013 Steven Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt 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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