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  <title>Concept DefaultConstructible</title>
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  <h2><span class="refentrytitle">Concept DefaultConstructible</span></h2>
  <p>DefaultConstructible</p>
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  <div class="refsect1">
  <a name="id-1.3.47.3.10.3"></a><h2>Description</h2>
  <p>DefaultConstructible objects only need to have a default
    constructor.</p>
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  <div class="refsect1">
  <a name="id-1.3.47.3.10.4"></a><h2>Notation</h2>
  <div class="variablelist"><dl class="variablelist">
  <dt><span class="term">X</span></dt>
  <dd>A type playing the role of default-constructible-type in the <a class="link" href="DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a> concept.</dd>
  </dl></div>
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  <div class="refsect1">
  <a name="id-1.3.47.3.10.5"></a><h2>Valid expressions</h2>
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  <colgroup>
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  <thead><tr>
  <th>Name</th>
  <th>Expression</th>
  <th>Type</th>
  <th>Semantics</th>
  </tr></thead>
  <tbody><tr>
  <td><p>Construction</p></td>
  <td><p>X()</p></td>
  <td><p><span class="type">X</span></p></td>
  <td><p>Construct an instance of the type with default parameters.</p></td>
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  <a name="id-1.3.47.3.10.6"></a><h2>Models</h2>
  <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  <li class="listitem"><span class="simplelist"><span class="type">int</span></span></li>
  <li class="listitem"><span class="simplelist"><span class="type">std::vector&lt;double&gt;</span></span></li>
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  <td align="right"><div class="copyright-footer">Copyright © 2001, 2002 Indiana University<br>Copyright © 2000, 2001 University of Notre Dame du Lac<br>Copyright © 2000 Jeremy Siek, Lie-Quan Lee, Andrew Lumsdaine<br>Copyright © 1996-1999 Silicon Graphics Computer Systems, Inc.<br>Copyright © 1994 Hewlett-Packard Company<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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  <p>This product includes software developed at the University
        of Notre Dame and the Pervasive Technology Labs at Indiana
        University. For technical information contact Andrew Lumsdaine
        at the Pervasive Technology Labs at Indiana University.  For
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  <p>Some concepts based on versions from the MTL draft manual
        and Boost Graph and Property Map documentation, the SGI Standard
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        under the following license: 
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