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 </div>
 <div class="section">
 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
 <a name="variant.misc"></a>Miscellaneous Notes</h2></div></div></div>
 <div class="toc"><dl>
 <dt><span class="section"><a href="misc.html#variant.versus-any">Boost.Variant vs. Boost.Any</a></span></dt>
 <dt><span class="section"><a href="misc.html#id3090266">Portability</a></span></dt>
 <dt><span class="section"><a href="misc.html#variant.troubleshooting">Troubleshooting</a></span></dt>
 <dt><span class="section"><a href="misc.html#variant.ack">Acknowledgments</a></span></dt>
 </dl></div>
 <div class="section">
 <div class="titlepage"><div><div><h3 class="title">
 <a name="variant.versus-any"></a>Boost.Variant vs. Boost.Any</h3></div></div></div>
 <p>As a discriminated union container, the Variant library shares many
     of the same features of the <a class="link" href="../any.html" title="Chapter&#160;2.&#160;Boost.Any">Any</a> library.
     However, since neither library wholly encapsulates the features of the
     other, one library cannot be generally recommended for use over the
     other.</p>
 <p>That said, Boost.Variant has several advantages over Boost.Any,
     such as:

     </p>
 <div class="itemizedlist"><ul class="itemizedlist" type="disc">
 <li class="listitem">Boost.Variant guarantees the type of its content is one of a
         finite, user-specified set of types.</li>
 <li class="listitem">Boost.Variant provides <span class="emphasis"><em>compile-time</em></span>
         checked visitation of its content. (By contrast, the current version
         of Boost.Any provides no visitation mechanism at all; but even if it
         did, it would need to be checked at run-time.)</li>
 <li class="listitem">Boost.Variant enables generic visitation of its content.
         (Even if Boost.Any did provide a visitation mechanism, it would enable
         visitation only of explicitly-specified types.)</li>
 <li class="listitem">Boost.Variant offers an efficient, stack-based storage scheme
         (avoiding the overhead of dynamic allocation).</li>
 </ul></div>
 <p>

   </p>
 <p>Of course, Boost.Any has several advantages over Boost.Variant,
     such as:

     </p>
 <div class="itemizedlist"><ul class="itemizedlist" type="disc">
 <li class="listitem">Boost.Any, as its name implies, allows virtually any type for
         its content, providing great flexibility.</li>
 <li class="listitem">Boost.Any provides the no-throw guarantee of exception safety
         for its swap operation.</li>
 <li class="listitem">Boost.Any makes little use of template metaprogramming
         techniques (avoiding potentially hard-to-read error messages and
         significant compile-time processor and memory demands).</li>
 </ul></div>
 <p>

   </p>
 </div>
 <div class="section">
 <div class="titlepage"><div><div><h3 class="title">
 <a name="id3090266"></a>Portability</h3></div></div></div>
 <p>The library aims for 100% ANSI/ISO C++ conformance. However, this is
     strictly impossible due to the inherently non-portable nature of the
     <a href="../../../libs/type_traits/index.html" target="_top">Type Traits</a> library's
     <code class="computeroutput">type_with_alignment</code> facility. In
     practice though, no compilers or platforms have been discovered where this
     reliance on undefined behavior has been an issue.</p>
 <p>Additionally, significant effort has been expended to ensure proper
     functioning despite various compiler bugs and other conformance problems.
     To date the library testsuite has
     been compiled and tested successfully on at least the following compilers
     for basic and advanced functionality:

     </p>
 <div class="informaltable"><table class="table">
 <colgroup>
 <col>
 <col>
 <col>
 <col>
 <col>
 </colgroup>
 <thead><tr>
 <th>&#160;</th>
 <th>Basic</th>
 <th>
               <code class="computeroutput">variant&lt;T&amp;&gt;</code>
             </th>
 <th>
               <a class="link" href="tutorial.html#variant.tutorial.over-sequence" title="Using a type sequence to specify bounded types">
                 <code class="computeroutput">make_variant_over</code>
               </a>
             </th>
 <th>
               <a class="link" href="tutorial.html#variant.tutorial.recursive.recursive-variant" title="Recursive types with make_recursive_variant">
                 <code class="computeroutput">make_recursive_variant</code>
               </a>
             </th>
 </tr></thead>
 <tbody>
 <tr>
 <td>Borland C++ 5.5.1 and 5.6.4</td>
 <td>X</td>
 <td>X</td>
 <td>&#160;</td>
 <td>&#160;</td>
 </tr>
 <tr>
 <td>Comeau C++ 4.3.0</td>
 <td>X</td>
 <td>X</td>
 <td>X</td>
 <td>X</td>
 </tr>
 <tr>
 <td>GNU GCC 3.3.1</td>
 <td>X</td>
 <td>X</td>
 <td>X</td>
 <td>X</td>
 </tr>
 <tr>
 <td>GNU GCC 2.95.3</td>
 <td>X</td>
 <td>X</td>
 <td>&#160;</td>
 <td>X</td>
 </tr>
 <tr>
 <td>Intel C++ 7.0</td>
 <td>X</td>
 <td>&#160;</td>
 <td>X</td>
 <td>X</td>
 </tr>
 <tr>
 <td>Metrowerks CodeWarrior 8.3</td>
 <td>X</td>
 <td>&#160;</td>
 <td>X</td>
 <td>X</td>
 </tr>
 <tr>
 <td>Microsoft Visual C++ 7.1</td>
 <td>X</td>
 <td>X</td>
 <td>X</td>
 <td>X</td>
 </tr>
 <tr>
 <td>Microsoft Visual C++ 6 SP5 and 7</td>
 <td>X</td>
 <td>&#160;</td>
 <td>&#160;</td>
 <td>&#160;</td>
 </tr>
 </tbody>
 </table></div>
 <p>

   </p>
 <p>Finally, the current state of the testsuite in CVS may be found on the
     <a href="http://boost.sourceforge.net/regression-logs" target="_top">Test Summary</a>
     page. Please note, however, that this page reports on day-to-day changes
     to inter-release code found in the Boost CVS and thus likely does not
     match the state of code found in Boost releases.</p>
 </div>
 <div class="section">
 <div class="titlepage"><div><div><h3 class="title">
 <a name="variant.troubleshooting"></a>Troubleshooting</h3></div></div></div>
 <div class="toc"><dl>
 <dt><span class="section"><a href="misc.html#variant.troubleshooting.template-depth">"Template instantiation depth exceeds maximum"</a></span></dt>
 <dt><span class="section"><a href="misc.html#variant.troubleshooting.compiler-memory">"Internal heap limit reached"</a></span></dt>
 </dl></div>
 <p>Due to the heavy use of templates in the implementation of
   <code class="computeroutput">variant</code>, it is not uncommon when compiling to encounter
   problems related to template instantiaton depth, compiler memory, etc. This
   section attempts to provide advice to common problems experienced on several
   popular compilers.</p>
 <p>(This section is still in progress, with additional advice/feedback
   welcome. Please post to the Boost-Users list with any useful experiences you
   may have.)</p>
 <div class="section">
 <div class="titlepage"><div><div><h4 class="title">
 <a name="variant.troubleshooting.template-depth"></a>"Template instantiation depth exceeds maximum"</h4></div></div></div>
 <div class="toc"><dl><dt><span class="section"><a href="misc.html#variant.troubleshooting.template-depth.gcc">GNU GCC</a></span></dt></dl></div>
 <div class="section">
 <div class="titlepage"><div><div><h5 class="title">
 <a name="variant.troubleshooting.template-depth.gcc"></a>GNU GCC</h5></div></div></div>
 <p>The compiler option
         <code class="computeroutput">-ftemplate-depth-<span class="emphasis"><em>NN</em></span></code> can increase the
         maximum allowed instantiation depth. (Try
         <code class="computeroutput">-ftemplate-depth-50</code>.)</p>
 </div>
 </div>
 <div class="section">
 <div class="titlepage"><div><div><h4 class="title">
 <a name="variant.troubleshooting.compiler-memory"></a>"Internal heap limit reached"</h4></div></div></div>
 <div class="toc"><dl><dt><span class="section"><a href="misc.html#variant.troubleshooting.compiler-memory.msvc">Microsoft Visual C++</a></span></dt></dl></div>
 <div class="section">
 <div class="titlepage"><div><div><h5 class="title">
 <a name="variant.troubleshooting.compiler-memory.msvc"></a>Microsoft Visual C++</h5></div></div></div>
 <p>The compiler option <code class="computeroutput">/Zm<span class="emphasis"><em>NNN</em></span></code> can
         increase the memory allocation limit. The <code class="computeroutput">NNN</code> is a
         scaling percentage (i.e., <code class="computeroutput">100</code> denotes the default limit).
         (Try <code class="computeroutput">/Zm200</code>.)</p>
 </div>
 </div>
 </div>
 <div class="section">
 <div class="titlepage"><div><div><h3 class="title">
 <a name="variant.ack"></a>Acknowledgments</h3></div></div></div>
 <p>Eric Friedman and Itay Maman designed the initial submission; Eric was
   the primary implementer.</p>
 <p>Eric is also the library maintainer and has expanded upon the initial
   submission -- adding
   <code class="computeroutput"><a class="link" href="../boost/make_recursive_variant.html" title="Class template make_recursive_variant">make_recursive_variant</a></code>,
   <code class="computeroutput"><a class="link" href="../boost/make_variant_over.html" title="Class template make_variant_over">make_variant_over</a></code>, support for
   reference content, etc.</p>
 <p>Andrei Alexandrescu's work in
     [<a class="link" href="refs.html#variant.refs.ale01a">Ale01a</a>]
 and
     [<a class="link" href="refs.html#variant.refs.ale02">Ale02</a>]
 inspired the library's design.</p>
 <p>Jeff Garland was the formal review manager.</p>
 <p>Douglas Gregor,
 Dave Abrahams,
 Anthony Williams,
 Fernando Cacciola,
 Joel de Guzman,
 Dirk Schreib,
 Brad King,
 Giovanni Bajo,
 Eugene Gladyshev,
 and others provided helpful feedback and suggestions to refine the semantics,
 interface, and implementation of the library.</p>
 </div>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
 <td align="right"><div class="copyright-footer">Copyright &#169; 2002, 2003 Eric Friedman, Itay Maman<p>Distributed under the Boost Software License, Version 1.0.
     (See accompanying file <code class="filename">LICENSE_1_0.txt</code> or copy at
     <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
     </p>
 </div></td>
 </tr></table>
 <hr>
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 <a accesskey="p" href="design.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../variant.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="refs.html"><img src="../../../doc/src/images/next.png" alt="Next"></a>
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	</div>
	<div class="section">
	<div class="titlepage"><div><div><h2 class="title" style="clear: both">
	<a name="variant.misc"></a>Miscellaneous Notes</h2></div></div></div>
	<div class="toc"><dl>
	<dt><span class="section"><a href="misc.html#variant.versus-any">Boost.Variant vs. Boost.Any</a></span></dt>
	<dt><span class="section"><a href="misc.html#id3090266">Portability</a></span></dt>
	<dt><span class="section"><a href="misc.html#variant.troubleshooting">Troubleshooting</a></span></dt>
	<dt><span class="section"><a href="misc.html#variant.ack">Acknowledgments</a></span></dt>
	</dl></div>
	<div class="section">
	<div class="titlepage"><div><div><h3 class="title">
	<a name="variant.versus-any"></a>Boost.Variant vs. Boost.Any</h3></div></div></div>
	<p>As a discriminated union container, the Variant library shares many
	of the same features of the <a class="link" href="../any.html" title="Chapter 2. Boost.Any">Any</a> library.
	However, since neither library wholly encapsulates the features of the
	other, one library cannot be generally recommended for use over the
	other.</p>
	<p>That said, Boost.Variant has several advantages over Boost.Any,
	such as:

	</p>
	<div class="itemizedlist"><ul class="itemizedlist" type="disc">
	<li class="listitem">Boost.Variant guarantees the type of its content is one of a
	finite, user-specified set of types.</li>
	<li class="listitem">Boost.Variant provides <span class="emphasis"><em>compile-time</em></span>
	checked visitation of its content. (By contrast, the current version
	of Boost.Any provides no visitation mechanism at all; but even if it
	did, it would need to be checked at run-time.)</li>
	<li class="listitem">Boost.Variant enables generic visitation of its content.
	(Even if Boost.Any did provide a visitation mechanism, it would enable
	visitation only of explicitly-specified types.)</li>
	<li class="listitem">Boost.Variant offers an efficient, stack-based storage scheme
	(avoiding the overhead of dynamic allocation).</li>
	</ul></div>
	<p>

	</p>
	<p>Of course, Boost.Any has several advantages over Boost.Variant,
	such as:

	</p>
	<div class="itemizedlist"><ul class="itemizedlist" type="disc">
	<li class="listitem">Boost.Any, as its name implies, allows virtually any type for
	its content, providing great flexibility.</li>
	<li class="listitem">Boost.Any provides the no-throw guarantee of exception safety
	for its swap operation.</li>
	<li class="listitem">Boost.Any makes little use of template metaprogramming
	techniques (avoiding potentially hard-to-read error messages and
	significant compile-time processor and memory demands).</li>
	</ul></div>
	<p>

	</p>
	</div>
	<div class="section">
	<div class="titlepage"><div><div><h3 class="title">
	<a name="id3090266"></a>Portability</h3></div></div></div>
	<p>The library aims for 100% ANSI/ISO C++ conformance. However, this is
	strictly impossible due to the inherently non-portable nature of the
	<a href="../../../libs/type_traits/index.html" target="_top">Type Traits</a> library's
	<code class="computeroutput">type_with_alignment</code> facility. In
	practice though, no compilers or platforms have been discovered where this
	reliance on undefined behavior has been an issue.</p>
	<p>Additionally, significant effort has been expended to ensure proper
	functioning despite various compiler bugs and other conformance problems.
	To date the library testsuite has
	been compiled and tested successfully on at least the following compilers
	for basic and advanced functionality:

	</p>
	<div class="informaltable"><table class="table">
	<colgroup>
	<col>
	<col>
	<col>
	<col>
	<col>
	</colgroup>
	<thead><tr>
	<th> </th>
	<th>Basic</th>
	<th>
	<code class="computeroutput">variant<T&></code>
	</th>
	<th>
	<a class="link" href="tutorial.html#variant.tutorial.over-sequence" title="Using a type sequence to specify bounded types">
	<code class="computeroutput">make_variant_over</code>
	</a>
	</th>
	<th>
	<a class="link" href="tutorial.html#variant.tutorial.recursive.recursive-variant" title="Recursive types with make_recursive_variant">
	<code class="computeroutput">make_recursive_variant</code>
	</a>
	</th>
	</tr></thead>
	<tbody>
	<tr>
	<td>Borland C++ 5.5.1 and 5.6.4</td>
	<td>X</td>
	<td>X</td>
	<td> </td>
	<td> </td>
	</tr>
	<tr>
	<td>Comeau C++ 4.3.0</td>
	<td>X</td>
	<td>X</td>
	<td>X</td>
	<td>X</td>
	</tr>
	<tr>
	<td>GNU GCC 3.3.1</td>
	<td>X</td>
	<td>X</td>
	<td>X</td>
	<td>X</td>
	</tr>
	<tr>
	<td>GNU GCC 2.95.3</td>
	<td>X</td>
	<td>X</td>
	<td> </td>
	<td>X</td>
	</tr>
	<tr>
	<td>Intel C++ 7.0</td>
	<td>X</td>
	<td> </td>
	<td>X</td>
	<td>X</td>
	</tr>
	<tr>
	<td>Metrowerks CodeWarrior 8.3</td>
	<td>X</td>
	<td> </td>
	<td>X</td>
	<td>X</td>
	</tr>
	<tr>
	<td>Microsoft Visual C++ 7.1</td>
	<td>X</td>
	<td>X</td>
	<td>X</td>
	<td>X</td>
	</tr>
	<tr>
	<td>Microsoft Visual C++ 6 SP5 and 7</td>
	<td>X</td>
	<td> </td>
	<td> </td>
	<td> </td>
	</tr>
	</tbody>
	</table></div>
	<p>

	</p>
	<p>Finally, the current state of the testsuite in CVS may be found on the
	<a href="http://boost.sourceforge.net/regression-logs" target="_top">Test Summary</a>
	page. Please note, however, that this page reports on day-to-day changes
	to inter-release code found in the Boost CVS and thus likely does not
	match the state of code found in Boost releases.</p>
	</div>
	<div class="section">
	<div class="titlepage"><div><div><h3 class="title">
	<a name="variant.troubleshooting"></a>Troubleshooting</h3></div></div></div>
	<div class="toc"><dl>
	<dt><span class="section"><a href="misc.html#variant.troubleshooting.template-depth">"Template instantiation depth exceeds maximum"</a></span></dt>
	<dt><span class="section"><a href="misc.html#variant.troubleshooting.compiler-memory">"Internal heap limit reached"</a></span></dt>
	</dl></div>
	<p>Due to the heavy use of templates in the implementation of
	<code class="computeroutput">variant</code>, it is not uncommon when compiling to encounter
	problems related to template instantiaton depth, compiler memory, etc. This
	section attempts to provide advice to common problems experienced on several
	popular compilers.</p>
	<p>(This section is still in progress, with additional advice/feedback
	welcome. Please post to the Boost-Users list with any useful experiences you
	may have.)</p>
	<div class="section">
	<div class="titlepage"><div><div><h4 class="title">
	<a name="variant.troubleshooting.template-depth"></a>"Template instantiation depth exceeds maximum"</h4></div></div></div>
	<div class="toc"><dl><dt><span class="section"><a href="misc.html#variant.troubleshooting.template-depth.gcc">GNU GCC</a></span></dt></dl></div>
	<div class="section">
	<div class="titlepage"><div><div><h5 class="title">
	<a name="variant.troubleshooting.template-depth.gcc"></a>GNU GCC</h5></div></div></div>
	<p>The compiler option
	<code class="computeroutput">-ftemplate-depth-<span class="emphasis"><em>NN</em></span></code> can increase the
	maximum allowed instantiation depth. (Try
	<code class="computeroutput">-ftemplate-depth-50</code>.)</p>
	</div>
	</div>
	<div class="section">
	<div class="titlepage"><div><div><h4 class="title">
	<a name="variant.troubleshooting.compiler-memory"></a>"Internal heap limit reached"</h4></div></div></div>
	<div class="toc"><dl><dt><span class="section"><a href="misc.html#variant.troubleshooting.compiler-memory.msvc">Microsoft Visual C++</a></span></dt></dl></div>
	<div class="section">
	<div class="titlepage"><div><div><h5 class="title">
	<a name="variant.troubleshooting.compiler-memory.msvc"></a>Microsoft Visual C++</h5></div></div></div>
	<p>The compiler option <code class="computeroutput">/Zm<span class="emphasis"><em>NNN</em></span></code> can
	increase the memory allocation limit. The <code class="computeroutput">NNN</code> is a
	scaling percentage (i.e., <code class="computeroutput">100</code> denotes the default limit).
	(Try <code class="computeroutput">/Zm200</code>.)</p>
	</div>
	</div>
	</div>
	<div class="section">
	<div class="titlepage"><div><div><h3 class="title">
	<a name="variant.ack"></a>Acknowledgments</h3></div></div></div>
	<p>Eric Friedman and Itay Maman designed the initial submission; Eric was
	the primary implementer.</p>
	<p>Eric is also the library maintainer and has expanded upon the initial
	submission -- adding
	<code class="computeroutput"><a class="link" href="../boost/make_recursive_variant.html" title="Class template make_recursive_variant">make_recursive_variant</a></code>,
	<code class="computeroutput"><a class="link" href="../boost/make_variant_over.html" title="Class template make_variant_over">make_variant_over</a></code>, support for
	reference content, etc.</p>
	<p>Andrei Alexandrescu's work in
	[<a class="link" href="refs.html#variant.refs.ale01a">Ale01a</a>]
	and
	[<a class="link" href="refs.html#variant.refs.ale02">Ale02</a>]
	inspired the library's design.</p>
	<p>Jeff Garland was the formal review manager.</p>
	<p>Douglas Gregor,
	Dave Abrahams,
	Anthony Williams,
	Fernando Cacciola,
	Joel de Guzman,
	Dirk Schreib,
	Brad King,
	Giovanni Bajo,
	Eugene Gladyshev,
	and others provided helpful feedback and suggestions to refine the semantics,
	interface, and implementation of the library.</p>
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	(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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