ceph/src/boost/libs/optional/doc/html/boost_optional/reference/io_header/io_semantics.html

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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_optional.reference.io_header.io_semantics"></a><a class="link" href="io_semantics.html" title="Detailed semantics">Detailed
  28         semantics</a>
  29 </h4></div></div></div>
  30 <p>
  31           <a name="reference_operator_ostream"></a><code class="computeroutput"><span class="keyword">template</span>
  32           <span class="special">&lt;</span><span class="keyword">class</span>
  33           <span class="identifier">CharType</span><span class="special">,</span>
  34           <span class="keyword">class</span> <span class="identifier">CharTrait</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span></code>
  35           <br> &#160;&#160;&#160;&#160;<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharType</span><span class="special">,</span> <span class="identifier">CharTrait</span><span class="special">&gt;&amp;</span></code> <br> &#160;&#160;&#160;&#160;<code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharType</span><span class="special">,</span> <span class="identifier">CharTrait</span><span class="special">&gt;&amp;</span>
  36           <span class="identifier">out</span><span class="special">,</span>
  37           <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">v</span><span class="special">);</span></code>
  38         </p>
  39 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  40 <li class="listitem">
  41               <span class="bold"><strong>Effect:</strong></span> Outputs an implementation-defined
  42               string. The output contains the information about whether the optional
  43               object contains a value or not. If <code class="computeroutput"><span class="identifier">v</span></code>
  44               contains a value, the output contains result of calling <code class="computeroutput"><span class="identifier">out</span> <span class="special">&lt;&lt;</span>
  45               <span class="special">*</span><span class="identifier">v</span></code>.
  46             </li>
  47 <li class="listitem">
  48               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">out</span></code>.
  49             </li>
  50 </ul></div>
  51 <p>
  52           <span class="inlinemediaobject"><img src="../../../images/space.png" alt="space"></span> <a name="reference_operator_ostream_none"></a>
  53         </p>
  54 <p>
  55           <code class="computeroutput"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharType</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">CharTrait</span><span class="special">,</span>
  56           <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span></code> <br> &#160;&#160;&#160;&#160;<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharType</span><span class="special">,</span> <span class="identifier">CharTrait</span><span class="special">&gt;&amp;</span></code>
  57           <br> &#160;&#160;&#160;&#160;<code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharType</span><span class="special">,</span> <span class="identifier">CharTrait</span><span class="special">&gt;&amp;</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">none_t</span><span class="special">);</span></code>
  58         </p>
  59 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  60 <li class="listitem">
  61               <span class="bold"><strong>Effect:</strong></span> Outputs an implementation-defined
  62               string.
  63             </li>
  64 <li class="listitem">
  65               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">out</span></code>.
  66             </li>
  67 </ul></div>
  68 <p>
  69           <span class="inlinemediaobject"><img src="../../../images/space.png" alt="space"></span> <a name="reference_operator_istream"></a>
  70         </p>
  71 <p>
  72           <code class="computeroutput"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharType</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">CharTrait</span><span class="special">,</span>
  73           <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span></code> <br> &#160;&#160;&#160;&#160;<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharType</span><span class="special">,</span> <span class="identifier">CharTrait</span><span class="special">&gt;&amp;</span></code>
  74           <br> &#160;&#160;&#160;&#160;<code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharType</span><span class="special">,</span> <span class="identifier">CharTrait</span><span class="special">&gt;&amp;</span> <span class="identifier">in</span><span class="special">,</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;&amp;</span> <span class="identifier">v</span><span class="special">);</span></code>
  75         </p>
  76 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  77 <li class="listitem">
  78               <span class="bold"><strong>Requires:</strong></span> <code class="computeroutput"><span class="identifier">T</span></code>
  79               is <a href="http://www.sgi.com/tech/stl/DefaultConstructible.html" target="_top"><code class="computeroutput"><span class="identifier">DefaultConstructible</span></code></a> and
  80               <code class="computeroutput"><span class="identifier">MoveConstructible</span></code>.
  81             </li>
  82 <li class="listitem">
  83               <span class="bold"><strong>Effect:</strong></span> Reads the value of optional
  84               object from <code class="computeroutput"><span class="identifier">in</span></code>. If
  85               the string representation indicates that the optional object should
  86               contain a value, <code class="computeroutput"><span class="identifier">v</span></code>
  87               contains a value and its contained value is obtained as if by default-constructing
  88               an object <code class="computeroutput"><span class="identifier">o</span></code> of type
  89               <code class="computeroutput"><span class="identifier">T</span></code> and then calling
  90               <code class="computeroutput"><span class="identifier">in</span> <span class="special">&gt;&gt;</span>
  91               <span class="identifier">o</span></code>; otherwise <code class="computeroutput"><span class="identifier">v</span></code> does not contain a value, and the
  92               previously contained value (if any) has been destroyed.
  93             </li>
  94 <li class="listitem">
  95               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">out</span></code>.
  96             </li>
  97 </ul></div>
  98 </div>
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 100 <td align="left"></td>
 101 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright &#169; 2014-2016 Andrzej Krzemie&#324;ski<p>
 102         Distributed under the Boost Software License, Version 1.0. (See accompanying
 103         file LICENSE_1_0.txt 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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