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<a name="variant.reference"></a>Reference</h2></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="reference.html#variant.concepts">Concepts</a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant_hpp">Header <boost/variant.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.variant_fwd_hpp">Header <boost/variant/variant_fwd.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.variant_hpp">Header <boost/variant/variant.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.recursive_variant_hpp">Header <boost/variant/recursive_variant.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.recursive_wrapper_hpp">Header <boost/variant/recursive_wrapper.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.apply_visitor_hpp">Header <boost/variant/apply_visitor.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.get_hpp">Header <boost/variant/get.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.bad_visit_hpp">Header <boost/variant/bad_visit.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.static_visitor_hpp">Header <boost/variant/static_visitor.hpp></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.variant.visitor_ptr_hpp">Header <boost/variant/visitor_ptr.hpp></a></span></dt>
</dl></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="variant.concepts"></a>Concepts</h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="reference.html#variant.concepts.bounded-type"><span class="emphasis"><em>BoundedType</em></span></a></span></dt>
<dt><span class="section"><a href="reference.html#variant.concepts.static-visitor"><span class="emphasis"><em>StaticVisitor</em></span></a></span></dt>
<dt><span class="section"><a href="reference.html#variant.concepts.output-streamable"><span class="emphasis"><em>OutputStreamable</em></span></a></span></dt>
</dl></div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="variant.concepts.bounded-type"></a><span class="emphasis"><em>BoundedType</em></span>
</h4></div></div></div>
<p>The requirements on a <span class="bold"><strong>bounded type</strong></span>
are as follows:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="../CopyConstructible.html" title="Concept CopyConstructible">CopyConstructible</a> [20.1.3].</li>
<li class="listitem">Destructor upholds the no-throw exception-safety
guarantee.</li>
<li class="listitem">Complete at the point of <code class="computeroutput">variant</code> template
instantiation. (See
<code class="computeroutput"><a class="link" href="../boost/recursive_wrapper.html" title="Class template recursive_wrapper">boost::recursive_wrapper</a><T></code>
for a type wrapper that accepts incomplete types to enable recursive
<code class="computeroutput">variant</code> types.)</li>
</ul></div>
<p>Every type specified as a template argument to
<code class="computeroutput"><a class="link" href="../boost/variant.html" title="Class template variant">variant</a></code> must at minimum fulfill the
above requirements. In addition, certain features of <code class="computeroutput">variant</code>
are available only if its bounded types meet the requirements of these
following additional concepts:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="../Assignable.html" title="Concept Assignable">Assignable</a>:
<code class="computeroutput">variant</code> is itself <span class="emphasis"><em>Assignable</em></span> if and
only if every one of its bounded types meets the requirements of the
concept. (Note that top-level <code class="computeroutput">const</code>-qualified types and
reference types do <span class="emphasis"><em>not</em></span> meet these
requirements.)</li>
<li class="listitem">
<a class="link" href="../DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a> [20.1.4]:
<code class="computeroutput">variant</code> is itself
<a class="link" href="../DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a> if and only if its first
bounded type (i.e., <code class="computeroutput">T1</code>) meets the requirements of the
concept.</li>
<li class="listitem">
<a class="link" href="../EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a>:
<code class="computeroutput">variant</code> is itself <a class="link" href="../EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a>
if and only if every one of its bounded types meets the requirements
of the concept.</li>
<li class="listitem">
<a class="link" href="../LessThanComparable.html" title="Concept LessThanComparable">LessThanComparable</a>:
<code class="computeroutput">variant</code> is itself <a class="link" href="../LessThanComparable.html" title="Concept LessThanComparable">LessThanComparable</a>
if and only if every one of its bounded types meets the requirements
of the concept.</li>
<li class="listitem">
<a class="link" href="reference.html#variant.concepts.output-streamable" title="OutputStreamable"><span class="emphasis"><em>OutputStreamable</em></span></a>:
<code class="computeroutput">variant</code> is itself <span class="emphasis"><em>OutputStreamable</em></span>
if and only if every one of its bounded types meets the requirements
of the concept.</li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="variant.concepts.static-visitor"></a><span class="emphasis"><em>StaticVisitor</em></span>
</h4></div></div></div>
<div class="toc"><dl><dt><span class="section"><a href="reference.html#variant.concepts.static-visitor.examples">Examples</a></span></dt></dl></div>
<p>The requirements on a <span class="bold"><strong>static
visitor</strong></span> of a type <code class="computeroutput">T</code> are as follows:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">Must allow invocation as a function by overloading
<code class="computeroutput">operator()</code>, unambiguously accepting any value of type
<code class="computeroutput">T</code>.</li>
<li class="listitem">Must expose inner type <code class="computeroutput">result_type</code>. (See
<code class="computeroutput"><a class="link" href="../boost/visitor_ptr.html" title="Function template visitor_ptr">boost::visitor_ptr</a></code> for a
solution to using functions as visitors.)</li>
<li class="listitem">If <code class="computeroutput">result_type</code> is not <code class="computeroutput">void</code>, then
each operation of the function object must return a value implicitly
convertible to <code class="computeroutput">result_type</code>.</li>
</ul></div>
<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="variant.concepts.static-visitor.examples"></a>Examples</h5></div></div></div>
<p>The following class satisfies the requirements of a static visitor
of several types (i.e., explicitly: <code class="computeroutput">int</code> and
<code class="computeroutput">std::string</code>; or, e.g., implicitly: <code class="computeroutput">short</code> and
<code class="computeroutput">const char *</code>; etc.):</p>
<pre class="programlisting">class my_visitor
: public <code class="computeroutput"><a class="link" href="../boost/static_visitor.html" title="Class template static_visitor">boost::static_visitor</a></code><int>
{
public:
int operator()(int i)
{
return i * 2;
}
int operator()(const std::string& s)
{
return s.length();
}
};</pre>
<p>Another example is the following class, whose function-call
operator is a member template, allowing it to operate on values of many
types. Thus, the following class is a visitor of any type that supports
streaming output (e.g., <code class="computeroutput">int</code>, <code class="computeroutput">double</code>,
<code class="computeroutput">std::string</code>, etc.):</p>
<pre class="programlisting">class printer
: public <code class="computeroutput"><a class="link" href="../boost/static_visitor.html" title="Class template static_visitor">boost::static_visitor</a></code><>
{
template <typename T>
void operator()(const T& t)
{
std::cout << t << std::endl;
}
};</pre>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="variant.concepts.output-streamable"></a><span class="emphasis"><em>OutputStreamable</em></span>
</h4></div></div></div>
<p>The requirements on an <span class="bold"><strong>output
streamable</strong></span> type <code class="computeroutput">T</code> are as follows:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">For any object <code class="computeroutput">t</code> of type <code class="computeroutput">T</code>,
<code class="computeroutput">std::cout << t</code> must be a valid
expression.</li></ul></div>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant_hpp"></a>Header <<a href="../../../boost/variant.hpp" target="_top">boost/variant.hpp</a>></h3></div></div></div>
<div class="toc"><dl><dt><span class="section"><a href="reference.html#variant.header.include-all"></a></span></dt></dl></div>
<div class="section">
<div class="titlepage"></div>
<p>This header exists simply as a convenience to the user, including
all of the headers in the <code class="computeroutput">boost/variant</code> directory.</p>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.variant_fwd_hpp"></a>Header <<a href="../../../boost/variant/variant_fwd.hpp" target="_top">boost/variant/variant_fwd.hpp</a>></h3></div></div></div>
<p>Provides forward declarations of the
<code class="computeroutput"><a class="link" href="../boost/variant.html" title="Class template variant">boost::variant</a></code>,
<code class="computeroutput"><a class="link" href="../boost/make_variant_over.html" title="Class template make_variant_over">boost::make_variant_over</a></code>,
<code class="computeroutput"><a class="link" href="../boost/make_recursive_variant.html" title="Class template make_recursive_variant">boost::make_recursive_variant</a></code>, and
<code class="computeroutput"><a class="link" href="../boost/make_recursive_variant__id1790944.html" title="Class template make_recursive_variant_over">boost::make_recursive_variant_over</a></code>
class templates and the <code class="computeroutput">boost::recursive_variant_</code> tag type.
Also defines several preprocessor symbols, as described below.</p>
<pre class="synopsis">
<a class="link" href="../BOOST_VARIANT_LIMIT_TYPES.html" title="Macro BOOST_VARIANT_LIMIT_TYPES">BOOST_VARIANT_LIMIT_TYPES</a>
<a class="link" href="../BOOST_VARIANT_ENUM_PARAMS.html" title="Macro BOOST_VARIANT_ENUM_PARAMS">BOOST_VARIANT_ENUM_PARAMS</a>(param)
<a class="link" href="../BOOST_VARIANT_ENUM_SHIFTED_PARAMS.html" title="Macro BOOST_VARIANT_ENUM_SHIFTED_PARAMS">BOOST_VARIANT_ENUM_SHIFTED_PARAMS</a>(param)
<a class="link" href="../BOOST_VARIANT_NO_REFERENCE_SUPPORT.html" title="Macro BOOST_VARIANT_NO_REFERENCE_SUPPORT">BOOST_VARIANT_NO_REFERENCE_SUPPORT</a>
<a class="link" href="../BOOST_VARIANT_NO_TYPE_SEQUENCE_SUPPORT.html" title="Macro BOOST_VARIANT_NO_TYPE_SEQUENCE_SUPPORT">BOOST_VARIANT_NO_TYPE_SEQUENCE_SUPPORT</a>
<a class="link" href="../BOOST_VARIANT_NO_FULL_RECURSIVE_VARIANT_SUPPORT.html" title="Macro BOOST_VARIANT_NO_FULL_RECURSIVE_VARIANT_SUPPORT">BOOST_VARIANT_NO_FULL_RECURSIVE_VARIANT_SUPPORT</a></pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.variant_hpp"></a>Header <<a href="../../../boost/variant/variant.hpp" target="_top">boost/variant/variant.hpp</a>></h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">template</span><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="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">,</span> <span class="special">...</span><span class="special">,</span>
<span class="keyword">typename</span> TN <span class="special">=</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">></span>
<span class="keyword">class</span> <a class="link" href="../boost/variant.html" title="Class template variant">variant</a><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sequence<span class="special">></span> <span class="keyword">class</span> <a class="link" href="../boost/make_variant_over.html" title="Class template make_variant_over">make_variant_over</a><span class="special">;</span>
<span class="keyword">template</span><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">></span>
<span class="keyword">void</span> <a class="link" href="../boost/swap_id1088215.html" title="Function template swap"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="../boost/variant.html" title="Class template variant">variant</a><span class="special"><</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">></span> <span class="special">&</span><span class="special">,</span> <a class="link" href="../boost/variant.html" title="Class template variant">variant</a><span class="special"><</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">></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> ElemType<span class="special">,</span> <span class="keyword">typename</span> Traits<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">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span><span class="identifier">ElemType</span><span class="special">,</span><span class="identifier">Traits</span><span class="special">></span> <span class="special">&</span>
<a class="link" href="../boost/operator_id1673477.html" title="Function template operator<<"><span class="keyword">operator</span><span class="special"><<</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span><span class="identifier">ElemType</span><span class="special">,</span><span class="identifier">Traits</span><span class="special">></span> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="../boost/variant.html" title="Class template variant">variant</a><span class="special"><</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">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span></pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.recursive_variant_hpp"></a>Header <<a href="../../../boost/variant/recursive_variant.hpp" target="_top">boost/variant/recursive_variant.hpp</a>></h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.recursive_variant_"></a><span class="identifier">recursive_variant_</span><span class="special">;</span>
<span class="keyword">template</span><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="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">,</span> <span class="special">...</span><span class="special">,</span>
<span class="keyword">typename</span> TN <span class="special">=</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">></span>
<span class="keyword">class</span> <a class="link" href="../boost/make_recursive_variant.html" title="Class template make_recursive_variant">make_recursive_variant</a><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sequence<span class="special">></span> <span class="keyword">class</span> <a class="link" href="../boost/make_recursive_variant__id1790944.html" title="Class template make_recursive_variant_over">make_recursive_variant_over</a><span class="special">;</span>
<span class="special">}</span></pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.recursive_wrapper_hpp"></a>Header <<a href="../../../boost/variant/recursive_wrapper.hpp" target="_top">boost/variant/recursive_wrapper.hpp</a>></h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">class</span> <a class="link" href="../boost/recursive_wrapper.html" title="Class template recursive_wrapper">recursive_wrapper</a><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">class</span> <a class="link" href="../boost/is_recursive_wrapper.html" title="Class template is_recursive_wrapper">is_recursive_wrapper</a><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">class</span> <a class="link" href="../boost/unwrap_recursive_wrapper.html" title="Class template unwrap_recursive_wrapper">unwrap_recursive_wrapper</a><span class="special">;</span>
<span class="special">}</span></pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.apply_visitor_hpp"></a>Header <<a href="../../../boost/variant/apply_visitor.hpp" target="_top">boost/variant/apply_visitor.hpp</a>></h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Visitor<span class="special">></span> <span class="keyword">class</span> <a class="link" href="../boost/apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t">apply_visitor_delayed_t</a><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Visitor<span class="special">,</span> <span class="keyword">typename</span> Variant<span class="special">></span>
<span class="keyword">typename</span> <span class="identifier">Visitor</span><span class="special">::</span><span class="identifier">result_type</span> <a class="link" href="../boost/apply_visitor.html" title="Function apply_visitor"><span class="identifier">apply_visitor</span></a><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Variant</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> Visitor<span class="special">,</span> <span class="keyword">typename</span> Variant<span class="special">></span>
<span class="keyword">typename</span> <span class="identifier">Visitor</span><span class="special">::</span><span class="identifier">result_type</span> <a class="link" href="../boost/apply_visitor.html" title="Function apply_visitor"><span class="identifier">apply_visitor</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Visitor</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Variant</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> BinaryVisitor<span class="special">,</span> <span class="keyword">typename</span> Variant1<span class="special">,</span> <span class="keyword">typename</span> Variant2<span class="special">></span>
<span class="keyword">typename</span> <span class="identifier">BinaryVisitor</span><span class="special">::</span><span class="identifier">result_type</span>
<a class="link" href="../boost/apply_visitor.html" title="Function apply_visitor"><span class="identifier">apply_visitor</span></a><span class="special">(</span><span class="identifier">BinaryVisitor</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Variant1</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Variant2</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> BinaryVisitor<span class="special">,</span> <span class="keyword">typename</span> Variant1<span class="special">,</span> <span class="keyword">typename</span> Variant2<span class="special">></span>
<span class="keyword">typename</span> <span class="identifier">BinaryVisitor</span><span class="special">::</span><span class="identifier">result_type</span>
<a class="link" href="../boost/apply_visitor.html" title="Function apply_visitor"><span class="identifier">apply_visitor</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">BinaryVisitor</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Variant1</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Variant2</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> Visitor<span class="special">></span>
<a class="link" href="../boost/apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t">apply_visitor_delayed_t</a><span class="special"><</span><span class="identifier">Visitor</span><span class="special">></span> <a class="link" href="../boost/apply_visitor.html" title="Function apply_visitor"><span class="identifier">apply_visitor</span></a><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span></pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.get_hpp"></a>Header <<a href="../../../boost/variant/get.hpp" target="_top">boost/variant/get.hpp</a>></h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">class</span> <a class="link" href="../boost/bad_get.html" title="Class bad_get">bad_get</a><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> 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">></span>
<span class="identifier">U</span> <span class="special">*</span> <a class="link" href="../boost/get_id1673528.html" title="Function get"><span class="identifier">get</span></a><span class="special">(</span><a class="link" href="../boost/variant.html" title="Class template variant">variant</a><span class="special"><</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">></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> 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">></span>
<span class="keyword">const</span> <span class="identifier">U</span> <span class="special">*</span> <a class="link" href="../boost/get_id1673528.html" title="Function get"><span class="identifier">get</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../boost/variant.html" title="Class template variant">variant</a><span class="special"><</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">></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> 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">></span>
<span class="identifier">U</span> <span class="special">&</span> <a class="link" href="../boost/get_id1673528.html" title="Function get"><span class="identifier">get</span></a><span class="special">(</span><a class="link" href="../boost/variant.html" title="Class template variant">variant</a><span class="special"><</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">></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> 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">></span>
<span class="keyword">const</span> <span class="identifier">U</span> <span class="special">&</span> <a class="link" href="../boost/get_id1673528.html" title="Function get"><span class="identifier">get</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../boost/variant.html" title="Class template variant">variant</a><span class="special"><</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">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span></pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.bad_visit_hpp"></a>Header <<a href="../../../boost/variant/bad_visit.hpp" target="_top">boost/variant/bad_visit.hpp</a>></h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">class</span> <a class="link" href="../boost/bad_visit.html" title="Class bad_visit">bad_visit</a><span class="special">;</span>
<span class="special">}</span></pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.static_visitor_hpp"></a>Header <<a href="../../../boost/variant/static_visitor.hpp" target="_top">boost/variant/static_visitor.hpp</a>></h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ResultType<span class="special">></span> <span class="keyword">class</span> <a class="link" href="../boost/static_visitor.html" title="Class template static_visitor">static_visitor</a><span class="special">;</span>
<span class="special">}</span></pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.variant.visitor_ptr_hpp"></a>Header <<a href="../../../boost/variant/visitor_ptr.hpp" target="_top">boost/variant/visitor_ptr.hpp</a>></h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> R<span class="special">></span> <span class="keyword">class</span> <a class="link" href="../boost/visitor_ptr_t.html" title="Class template visitor_ptr_t">visitor_ptr_t</a><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> R<span class="special">,</span> <span class="keyword">typename</span> T<span class="special">></span> <a class="link" href="../boost/visitor_ptr_t.html" title="Class template visitor_ptr_t">visitor_ptr_t</a><span class="special"><</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">R</span><span class="special">></span> <a class="link" href="../boost/visitor_ptr.html" title="Function template visitor_ptr"><span class="identifier">visitor_ptr</span></a><span class="special">(</span><span class="identifier">R</span> <span class="special">(</span><span class="special">*</span><span class="special">)</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span></pre>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 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>)
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