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  26 <a name="DefaultConstructible"></a><div class="titlepage"></div>
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  28 <h2><span class="refentrytitle">Concept DefaultConstructible</span></h2>
  29 <p>DefaultConstructible</p>
  30 </div>
  31 <div class="refsect1">
  32 <a name="idm45853365317232"></a><h2>Description</h2>
  33 <p>DefaultConstructible objects only need to have a default
  34   constructor.</p>
  35 </div>
  36 <div class="refsect1">
  37 <a name="idm45853365316512"></a><h2>Notation</h2>
  38 <div class="variablelist"><dl class="variablelist">
  39 <dt><span class="term">X</span></dt>
  40 <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>
  41 </dl></div>
  42 </div>
  43 <div class="refsect1">
  44 <a name="idm45853365314528"></a><h2>Valid expressions</h2>
  45 <div class="informaltable"><table class="table">
  46 <colgroup>
  47 <col>
  48 <col>
  49 <col>
  50 <col>
  51 </colgroup>
  52 <thead><tr>
  53 <th>Name</th>
  54 <th>Expression</th>
  55 <th>Type</th>
  56 <th>Semantics</th>
  57 </tr></thead>
  58 <tbody><tr>
  59 <td><p>Construction</p></td>
  60 <td><p>X()</p></td>
  61 <td><p><span class="type">X</span></p></td>
  62 <td><p>Construct an instance of the type with default parameters.</p></td>
  63 </tr></tbody>
  64 </table></div>
  65 </div>
  66 <div class="refsect1">
  67 <a name="idm45853365310368"></a><h2>Models</h2>
  68 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  69 <li class="listitem"><span class="simplelist"><span class="type">int</span></span></li>
  70 <li class="listitem"><span class="simplelist"><span class="type">std::vector&lt;double&gt;</span></span></li>
  71 </ul></div>
  72 </div>
  73 </div>
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