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3<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
4<title>Reference</title>
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7<link rel="start" href="../index.html" title="The Boost C++ Libraries">
8<link rel="up" href="../variant.html" title="Chapter 15. Boost.Variant">
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23<a accesskey="p" href="tutorial.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../variant.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../BOOST_VARIANT_LIMIT_TYPES.html"><img src="../images/next.png" alt="Next"></a>
24</div>
25<div class="section" lang="en">
26<div class="titlepage"><div><div><h3 class="title">
27<a name="variant.reference"></a>Reference</h3></div></div></div>
28<div class="toc"><dl>
29<dt><span class="section"><a href="reference.html#variant.concepts">Concepts</a></span></dt>
30<dt><span class="section"><a href="reference.html#header.boost.variant.hpp">Header &lt;boost/variant.hpp&gt;</a></span></dt>
31<dt><span class="section"><a href="reference.html#id2654455">Header &lt;boost/variant/variant_fwd.hpp&gt;</a></span></dt>
32<dt><span class="section"><a href="reference.html#id2540137">Header &lt;boost/variant/variant.hpp&gt;</a></span></dt>
33<dt><span class="section"><a href="reference.html#id2551122">Header &lt;boost/variant/recursive_variant.hpp&gt;</a></span></dt>
34<dt><span class="section"><a href="reference.html#id2644455">Header &lt;boost/variant/recursive_wrapper.hpp&gt;</a></span></dt>
35<dt><span class="section"><a href="reference.html#id2660594">Header &lt;boost/variant/apply_visitor.hpp&gt;</a></span></dt>
36<dt><span class="section"><a href="reference.html#id2588868">Header &lt;boost/variant/get.hpp&gt;</a></span></dt>
37<dt><span class="section"><a href="reference.html#id2634493">Header &lt;boost/variant/bad_visit.hpp&gt;</a></span></dt>
38<dt><span class="section"><a href="reference.html#id2645589">Header &lt;boost/variant/static_visitor.hpp&gt;</a></span></dt>
39<dt><span class="section"><a href="reference.html#id2551546">Header &lt;boost/variant/visitor_ptr.hpp&gt;</a></span></dt>
40</dl></div>
41<div class="section" lang="en">
42<div class="titlepage"><div><div><h4 class="title">
43<a name="variant.concepts"></a>Concepts</h4></div></div></div>
44<div class="toc"><dl>
45<dt><span class="section"><a href="reference.html#variant.concepts.bounded-type"><span class="emphasis"><em>BoundedType</em></span></a></span></dt>
46<dt><span class="section"><a href="reference.html#variant.concepts.static-visitor"><span class="emphasis"><em>StaticVisitor</em></span></a></span></dt>
47<dt><span class="section"><a href="reference.html#variant.concepts.output-streamable"><span class="emphasis"><em>OutputStreamable</em></span></a></span></dt>
48</dl></div>
49<div class="section" lang="en">
50<div class="titlepage"><div><div><h5 class="title">
51<a name="variant.concepts.bounded-type"></a><span class="emphasis"><em>BoundedType</em></span></h5></div></div></div>
52<p>The requirements on a <span class="bold"><strong>bounded type</strong></span>
53      are as follows:</p>
54<div class="itemizedlist"><ul type="disc">
55<li>
56<a href="../CopyConstructible.html" title="Concept CopyConstructible">CopyConstructible</a> [20.1.3].</li>
57<li>Destructor upholds the no-throw exception-safety
58        guarantee.</li>
59<li>Complete at the point of <code class="computeroutput">variant</code> template
60        instantiation. (See
61        <code class="computeroutput"><a href="../recursive_wrapper.html" title="Class template recursive_wrapper">boost::recursive_wrapper</a>&lt;T&gt;</code>
62        for a type wrapper that accepts incomplete types to enable recursive
63        <code class="computeroutput">variant</code> types.)</li>
64</ul></div>
65<p>Every type specified as a template argument to
66      <code class="computeroutput"><a href="../boost/variant.html" title="Class template variant">variant</a></code> must at minimum fulfill the
67      above requirements. In addition, certain features of <code class="computeroutput">variant</code>
68      are available only if its bounded types meet the requirements of these
69      following additional concepts:</p>
70<div class="itemizedlist"><ul type="disc">
71<li>
72<a href="../Assignable.html" title="Concept Assignable">Assignable</a>:
73        <code class="computeroutput">variant</code> is itself <span class="emphasis"><em>Assignable</em></span> if and
74        only if every one of its bounded types meets the requirements of the
75        concept. (Note that top-level <code class="computeroutput">const</code>-qualified types and
76        reference types do <span class="emphasis"><em>not</em></span> meet these
77        requirements.)</li>
78<li>
79<a href="../DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a> [20.1.4]:
80        <code class="computeroutput">variant</code> is itself
81        <a href="../DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a> if and only if its first
82        bounded type (i.e., <code class="computeroutput">T1</code>) meets the requirements of the
83        concept.</li>
84<li>
85<a href="../EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a>:
86        <code class="computeroutput">variant</code> is itself <a href="../EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a>
87        if and only if every one of its bounded types meets the requirements
88        of the concept.</li>
89<li>
90<a href="../LessThanComparable.html" title="Concept LessThanComparable">LessThanComparable</a>:
91        <code class="computeroutput">variant</code> is itself <a href="../LessThanComparable.html" title="Concept LessThanComparable">LessThanComparable</a>
92        if and only if every one of its bounded types meets the requirements
93        of the concept.</li>
94<li>
95<a href="reference.html#variant.concepts.output-streamable" title="OutputStreamable"><span class="emphasis"><em>OutputStreamable</em></span></a>:
96        <code class="computeroutput">variant</code> is itself <span class="emphasis"><em>OutputStreamable</em></span>
97        if and only if every one of its bounded types meets the requirements
98        of the concept.</li>
99</ul></div>
100</div>
101<div class="section" lang="en">
102<div class="titlepage"><div><div><h5 class="title">
103<a name="variant.concepts.static-visitor"></a><span class="emphasis"><em>StaticVisitor</em></span></h5></div></div></div>
104<div class="toc"><dl><dt><span class="section"><a href="reference.html#variant.concepts.static-visitor.examples">Examples</a></span></dt></dl></div>
105<p>The requirements on a <span class="bold"><strong>static
106    visitor</strong></span> of a type <code class="computeroutput">T</code> are as follows:</p>
107<div class="itemizedlist"><ul type="disc">
108<li>Must allow invocation as a function by overloading
109        <code class="computeroutput">operator()</code>, unambiguously accepting any value of type
110        <code class="computeroutput">T</code>.</li>
111<li>Must expose inner type <code class="computeroutput">result_type</code>. (See
112        <code class="computeroutput"><a href="../visitor_ptr.html" title="Function template visitor_ptr">boost::visitor_ptr</a></code> for a
113        solution to using functions as visitors.)</li>
114<li>If <code class="computeroutput">result_type</code> is not <code class="computeroutput">void</code>, then
115        each operation of the function object must return a value implicitly
116        convertible to <code class="computeroutput">result_type</code>.</li>
117</ul></div>
118<div class="section" lang="en">
119<div class="titlepage"><div><div><h6 class="title">
120<a name="variant.concepts.static-visitor.examples"></a>Examples</h6></div></div></div>
121<p>The following class satisfies the requirements of a static visitor
122      of several types (i.e., explicitly: <code class="computeroutput">int</code> and
123      <code class="computeroutput">std::string</code>; or, e.g., implicitly: <code class="computeroutput">short</code> and
124      <code class="computeroutput">const char *</code>; etc.):</p>
125<pre class="programlisting">class my_visitor
126    : public <code class="computeroutput"><a href="../static_visitor.html" title="Class template static_visitor">boost::static_visitor</a></code>&lt;int&gt;
127{
128public:
129
130    int operator()(int i)
131    {
132        return i * 2;
133    }
134
135    int operator()(const std::string&amp; s)
136    {
137        return s.length();
138    }
139
140};</pre>
141<p>Another example is the following class, whose function-call
142      operator is a member template, allowing it to operate on values of many
143      types. Thus, the following class is a visitor of any type that supports
144      streaming output (e.g., <code class="computeroutput">int</code>, <code class="computeroutput">double</code>,
145      <code class="computeroutput">std::string</code>, etc.):</p>
146<pre class="programlisting">class printer
147    : public <code class="computeroutput"><a href="../static_visitor.html" title="Class template static_visitor">boost::static_visitor</a></code>&lt;&gt;
148{
149    template &lt;typename T&gt;
150    void operator()(const T&amp; t)
151    {
152        std::cout &lt;&lt; t &lt;&lt; std::endl;
153    }
154};</pre>
155</div>
156</div>
157<div class="section" lang="en">
158<div class="titlepage"><div><div><h5 class="title">
159<a name="variant.concepts.output-streamable"></a><span class="emphasis"><em>OutputStreamable</em></span></h5></div></div></div>
160<p>The requirements on an <span class="bold"><strong>output
161      streamable</strong></span> type <code class="computeroutput">T</code> are as follows:</p>
162<div class="itemizedlist"><ul type="disc"><li>For any object <code class="computeroutput">t</code> of type <code class="computeroutput">T</code>,
163        <code class="computeroutput">std::cout &lt;&lt; t</code> must be a valid
164        expression.</li></ul></div>
165</div>
166</div>
167<div class="section" lang="en">
168<div class="titlepage"><div><div><h4 class="title">
169<a name="header.boost.variant.hpp"></a>Header &lt;<a href="../../../boost/variant.hpp" target="_top">boost/variant.hpp</a>&gt;</h4></div></div></div>
170<div class="toc"><dl><dt><span class="section"><a href="reference.html#variant.header.include-all"></a></span></dt></dl></div>
171<div class="section" lang="en">
172<div class="titlepage"></div>
173<p>This header exists simply as a convenience to the user, including
174      all of the headers in the <code class="computeroutput">boost/variant</code> directory.</p>
175</div>
176</div>
177<div class="section" lang="en">
178<div class="titlepage"><div><div><h4 class="title">
179<a name="id2654455"></a>Header &lt;<a href="../../../boost/variant/variant_fwd.hpp" target="_top">boost/variant/variant_fwd.hpp</a>&gt;</h4></div></div></div>
180<p>Provides forward declarations of the
181    <code class="computeroutput"><a href="../boost/variant.html" title="Class template variant">boost::variant</a></code>,
182    <code class="computeroutput"><a href="../make_variant_over.html" title="Class template make_variant_over">boost::make_variant_over</a></code>,
183    <code class="computeroutput"><a href="../make_recursive_variant.html" title="Class template make_recursive_variant">boost::make_recursive_variant</a></code>, and
184    <code class="computeroutput"><a href="../id2655704.html" title="Class template make_recursive_variant_over">boost::make_recursive_variant_over</a></code>
185    class templates and the <code class="computeroutput">boost::recursive_variant_</code> tag type.
186    Also defines several preprocessor symbols, as described below.</p>
187<pre class="synopsis">
188
189<a href="../BOOST_VARIANT_LIMIT_TYPES.html" title="Macro BOOST_VARIANT_LIMIT_TYPES">BOOST_VARIANT_LIMIT_TYPES</a>
190<a href="../BOOST_VARIANT_ENUM_PARAMS.html" title="Macro BOOST_VARIANT_ENUM_PARAMS">BOOST_VARIANT_ENUM_PARAMS</a>(param)
191<a href="../id2652694.html" title="Macro BOOST_VARIANT_ENUM_SHIFTED_PARAMS">BOOST_VARIANT_ENUM_SHIFTED_PARAMS</a>(param)
192<a href="../id2667605.html" title="Macro BOOST_VARIANT_NO_REFERENCE_SUPPORT">BOOST_VARIANT_NO_REFERENCE_SUPPORT</a>
193<a href="../id2648190.html" title="Macro BOOST_VARIANT_NO_TYPE_SEQUENCE_SUPPORT">BOOST_VARIANT_NO_TYPE_SEQUENCE_SUPPORT</a>
194<a href="../id2404411.html" title="Macro BOOST_VARIANT_NO_FULL_RECURSIVE_VARIANT_SUPPORT">BOOST_VARIANT_NO_FULL_RECURSIVE_VARIANT_SUPPORT</a></pre>
195</div>
196<div class="section" lang="en">
197<div class="titlepage"><div><div><h4 class="title">
198<a name="id2540137"></a>Header &lt;<a href="../../../boost/variant/variant.hpp" target="_top">boost/variant/variant.hpp</a>&gt;</h4></div></div></div>
199<pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost {
200  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2 = <span class="emphasis"><em>unspecified</em></span>, ...,
201           <span class="bold"><strong>typename</strong></span> TN = <span class="emphasis"><em>unspecified</em></span>&gt; 
202    <span class="bold"><strong>class</strong></span> <a href="../boost/variant.html" title="Class template variant">variant</a>;
203
204  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Sequence&gt; <span class="bold"><strong>class</strong></span> <a href="../make_variant_over.html" title="Class template make_variant_over">make_variant_over</a>;
205  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN&gt; 
206    <span class="type"><span class="bold"><strong>void</strong></span></span> <a href="../id2629621.html" title="Function template swap">swap</a>(<a href="../boost/variant.html" title="Class template variant">variant</a>&lt;T1, T2, ..., TN&gt; &amp;, <a href="../boost/variant.html" title="Class template variant">variant</a>&lt;T1, T2, ..., TN&gt; &amp;);
207  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> ElemType, <span class="bold"><strong>typename</strong></span> Traits, <span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ...,
208           <span class="bold"><strong>typename</strong></span> TN&gt; 
209    <span class="type">std::basic_ostream&lt;ElemType,Traits&gt; &amp;</span> 
210    <a href="../id2630804.html" title="Function template operator&lt;&lt;"><span class="bold"><strong>operator</strong></span>&lt;&lt;</a>(std::basic_ostream&lt;ElemType,Traits&gt; &amp;,
211               <span class="bold"><strong>const</strong></span> <a href="../boost/variant.html" title="Class template variant">variant</a>&lt;T1, T2, ..., TN&gt; &amp;);
212}</pre>
213</div>
214<div class="section" lang="en">
215<div class="titlepage"><div><div><h4 class="title">
216<a name="id2551122"></a>Header &lt;<a href="../../../boost/variant/recursive_variant.hpp" target="_top">boost/variant/recursive_variant.hpp</a>&gt;</h4></div></div></div>
217<pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost {
218  <span class="bold"><strong>typedef</strong></span> <span class="emphasis"><em>unspecified</em></span> recursive_variant_;
219
220  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2 = <span class="emphasis"><em>unspecified</em></span>, ...,
221           <span class="bold"><strong>typename</strong></span> TN = <span class="emphasis"><em>unspecified</em></span>&gt; 
222    <span class="bold"><strong>class</strong></span> <a href="../make_recursive_variant.html" title="Class template make_recursive_variant">make_recursive_variant</a>;
223  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Sequence&gt; <span class="bold"><strong>class</strong></span> <a href="../id2655704.html" title="Class template make_recursive_variant_over">make_recursive_variant_over</a>;
224}</pre>
225</div>
226<div class="section" lang="en">
227<div class="titlepage"><div><div><h4 class="title">
228<a name="id2644455"></a>Header &lt;<a href="../../../boost/variant/recursive_wrapper.hpp" target="_top">boost/variant/recursive_wrapper.hpp</a>&gt;</h4></div></div></div>
229<pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost {
230  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> T&gt; <span class="bold"><strong>class</strong></span> <a href="../recursive_wrapper.html" title="Class template recursive_wrapper">recursive_wrapper</a>;
231  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> T&gt; <span class="bold"><strong>class</strong></span> <a href="../is_recursive_wrapper.html" title="Class template is_recursive_wrapper">is_recursive_wrapper</a>;
232  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> T&gt; <span class="bold"><strong>class</strong></span> <a href="../unwrap_recursive_wrapper.html" title="Class template unwrap_recursive_wrapper">unwrap_recursive_wrapper</a>;
233}</pre>
234</div>
235<div class="section" lang="en">
236<div class="titlepage"><div><div><h4 class="title">
237<a name="id2660594"></a>Header &lt;<a href="../../../boost/variant/apply_visitor.hpp" target="_top">boost/variant/apply_visitor.hpp</a>&gt;</h4></div></div></div>
238<pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost {
239  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Visitor&gt; <span class="bold"><strong>class</strong></span> <a href="../apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t">apply_visitor_delayed_t</a>;
240  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Visitor, <span class="bold"><strong>typename</strong></span> Variant&gt; 
241    <span class="type"><span class="bold"><strong>typename</strong></span> Visitor::result_type</span> <a href="../apply_visitor.html" title="Function apply_visitor">apply_visitor</a>(Visitor &amp;, Variant &amp;);
242  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Visitor, <span class="bold"><strong>typename</strong></span> Variant&gt; 
243    <span class="type"><span class="bold"><strong>typename</strong></span> Visitor::result_type</span> <a href="../apply_visitor.html" title="Function apply_visitor">apply_visitor</a>(<span class="bold"><strong>const</strong></span> Visitor &amp;, Variant &amp;);
244  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> BinaryVisitor, <span class="bold"><strong>typename</strong></span> Variant1, <span class="bold"><strong>typename</strong></span> Variant2&gt; 
245    <span class="type"><span class="bold"><strong>typename</strong></span> BinaryVisitor::result_type</span> 
246    <a href="../apply_visitor.html" title="Function apply_visitor">apply_visitor</a>(BinaryVisitor &amp;, Variant1 &amp;, Variant2 &amp;);
247  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> BinaryVisitor, <span class="bold"><strong>typename</strong></span> Variant1, <span class="bold"><strong>typename</strong></span> Variant2&gt; 
248    <span class="type"><span class="bold"><strong>typename</strong></span> BinaryVisitor::result_type</span> 
249    <a href="../apply_visitor.html" title="Function apply_visitor">apply_visitor</a>(<span class="bold"><strong>const</strong></span> BinaryVisitor &amp;, Variant1 &amp;, Variant2 &amp;);
250  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Visitor&gt; 
251    <span class="type"><a href="../apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t">apply_visitor_delayed_t</a>&lt;Visitor&gt;</span> <a href="../apply_visitor.html" title="Function apply_visitor">apply_visitor</a>(Visitor &amp;);
252}</pre>
253</div>
254<div class="section" lang="en">
255<div class="titlepage"><div><div><h4 class="title">
256<a name="id2588868"></a>Header &lt;<a href="../../../boost/variant/get.hpp" target="_top">boost/variant/get.hpp</a>&gt;</h4></div></div></div>
257<pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost {
258  <span class="bold"><strong>class</strong></span> <a href="../bad_get.html" title="Class bad_get">bad_get</a>;
259  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> U, <span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN&gt; 
260    <span class="type">U *</span> <a href="../get.html" title="Function get">get</a>(<a href="../boost/variant.html" title="Class template variant">variant</a>&lt;T1, T2, ..., TN&gt; *);
261  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> U, <span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN&gt; 
262    <span class="type"><span class="bold"><strong>const</strong></span> U *</span> <a href="../get.html" title="Function get">get</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/variant.html" title="Class template variant">variant</a>&lt;T1, T2, ..., TN&gt; *);
263  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> U, <span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN&gt; 
264    <span class="type">U &amp;</span> <a href="../get.html" title="Function get">get</a>(<a href="../boost/variant.html" title="Class template variant">variant</a>&lt;T1, T2, ..., TN&gt; &amp;);
265  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> U, <span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN&gt; 
266    <span class="type"><span class="bold"><strong>const</strong></span> U &amp;</span> <a href="../get.html" title="Function get">get</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/variant.html" title="Class template variant">variant</a>&lt;T1, T2, ..., TN&gt; &amp;);
267}</pre>
268</div>
269<div class="section" lang="en">
270<div class="titlepage"><div><div><h4 class="title">
271<a name="id2634493"></a>Header &lt;<a href="../../../boost/variant/bad_visit.hpp" target="_top">boost/variant/bad_visit.hpp</a>&gt;</h4></div></div></div>
272<pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost {
273  <span class="bold"><strong>class</strong></span> <a href="../bad_visit.html" title="Class bad_visit">bad_visit</a>;
274}</pre>
275</div>
276<div class="section" lang="en">
277<div class="titlepage"><div><div><h4 class="title">
278<a name="id2645589"></a>Header &lt;<a href="../../../boost/variant/static_visitor.hpp" target="_top">boost/variant/static_visitor.hpp</a>&gt;</h4></div></div></div>
279<pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost {
280  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> ResultType&gt; <span class="bold"><strong>class</strong></span> <a href="../static_visitor.html" title="Class template static_visitor">static_visitor</a>;
281}</pre>
282</div>
283<div class="section" lang="en">
284<div class="titlepage"><div><div><h4 class="title">
285<a name="id2551546"></a>Header &lt;<a href="../../../boost/variant/visitor_ptr.hpp" target="_top">boost/variant/visitor_ptr.hpp</a>&gt;</h4></div></div></div>
286<pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost {
287  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> T, <span class="bold"><strong>typename</strong></span> R&gt; <span class="bold"><strong>class</strong></span> <a href="../visitor_ptr_t.html" title="Class template visitor_ptr_t">visitor_ptr_t</a>;
288  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> R, <span class="bold"><strong>typename</strong></span> T&gt; <span class="type"><a href="../visitor_ptr_t.html" title="Class template visitor_ptr_t">visitor_ptr_t</a>&lt;T,R&gt;</span> <a href="../visitor_ptr.html" title="Function template visitor_ptr">visitor_ptr</a>(R (*)(T));
289}</pre>
290</div>
291</div>
292<table width="100%"><tr>
293<td align="left"></td>
294<td align="right"><small>Copyright © 2002, 2003 Eric Friedman, Itay Maman</small></td>
295</tr></table>
296<hr>
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