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  19 <a name="boost.log.record_view"></a><div class="titlepage"></div>
  20 <div class="refnamediv">
  21 <h2><span class="refentrytitle">Class record_view</span></h2>
  22 <p>boost::log::record_view &#8212; Logging record view class. </p>
  23 </div>
  24 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  25 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../core_components.html#header.boost.log.core.record_view_hpp" title="Header &lt;boost/log/core/record_view.hpp&gt;">boost/log/core/record_view.hpp</a>&gt;
  26
  27 </span>
  28 <span class="keyword">class</span> <a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">{</span>
  29 <span class="keyword">public</span><span class="special">:</span>
  30   <span class="comment">// <a class="link" href="record_view.html#boost.log.record_viewconstruct-copy-destruct">construct/copy/destruct</a></span>
  31   <a class="link" href="record_view.html#idm45711350386736-bb"><span class="identifier">record_view</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  32   <a class="link" href="record_view.html#idm45711350384800-bb"><span class="identifier">record_view</span></a><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  33   <a class="link" href="record_view.html#idm45711350382848-bb"><span class="identifier">record_view</span></a><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  34   <a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;</span> <a class="link" href="record_view.html#idm45711350380032-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  35   <a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;</span> <a class="link" href="record_view.html#idm45711350377504-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  36   <a class="link" href="record_view.html#idm45711350380832-bb"><span class="special">~</span><span class="identifier">record_view</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  37
  38   <span class="comment">// <a class="link" href="record_view.html#idm45711350425552-bb">public member functions</a></span>
  39   <span class="identifier">attribute_value_set</span> <span class="keyword">const</span>  <span class="special">&amp;</span> <a class="link" href="record_view.html#idm45711350424992-bb"><span class="identifier">attribute_values</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  40   <span class="keyword">bool</span> <a class="link" href="record_view.html#idm45711350421952-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  41   <span class="keyword">bool</span> <a class="link" href="record_view.html#idm45711350416480-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  42   <span class="keyword">explicit</span> <a class="link" href="record_view.html#idm45711350412400-bb"><span class="keyword">operator</span> <span class="keyword">bool</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  43   <span class="keyword">bool</span> <a class="link" href="record_view.html#idm45711350408048-bb"><span class="keyword">operator</span><span class="special">!</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  44   <span class="keyword">void</span> <a class="link" href="record_view.html#idm45711350403968-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  45   <span class="keyword">void</span> <a class="link" href="record_view.html#idm45711350400016-bb"><span class="identifier">reset</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  46   <span class="identifier">attribute_value_set</span><span class="special">::</span><span class="identifier">mapped_type</span>
  47   <a class="link" href="record_view.html#idm45711350397200-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">attribute_value_set</span><span class="special">::</span><span class="identifier">key_type</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  48   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">&gt;</span>
  49     <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">extract</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  50     <a class="link" href="record_view.html#idm45711350393184-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  51 <span class="special">}</span><span class="special">;</span></pre></div>
  52 <div class="refsect1">
  53 <a name="idm45554755578352"></a><h2>Description</h2>
  54 <p>The logging record encapsulates all information related to a single logging statement, in particular, attribute values view and the log message string. The view is immutable, it is implemented as a wrapper around a reference-counted implementation. </p>
  55 <div class="refsect2">
  56 <a name="idm45554755577408"></a><h3>
  57 <a name="boost.log.record_viewconstruct-copy-destruct"></a><code class="computeroutput">record_view</code>
  58         public
  59        construct/copy/destruct</h3>
  60 <div class="orderedlist"><ol class="orderedlist" type="1">
  61 <li class="listitem">
  62 <pre class="literallayout"><a name="idm45711350386736-bb"></a><span class="identifier">record_view</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  63 <p>Default constructor. Creates an empty record view that is equivalent to the invalid record handle.</p>
  64 <p>
  65 </p>
  66 <div class="variablelist"><table border="0" class="variablelist compact">
  67 <colgroup>
  68 <col align="left" valign="top">
  69 <col>
  70 </colgroup>
  71 <tbody><tr>
  72 <td><p><span class="term">Postconditions:</span></p></td>
  73 <td><p><code class="computeroutput">!*this == true</code> </p></td>
  74 </tr></tbody>
  75 </table></div>
  76 </li>
  77 <li class="listitem">
  78 <pre class="literallayout"><a name="idm45711350384800-bb"></a><span class="identifier">record_view</span><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="keyword">const</span> <span class="special">&amp;</span> that<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
  79 <p>Copy constructor </p>
  80 </li>
  81 <li class="listitem">
  82 <pre class="literallayout"><a name="idm45711350382848-bb"></a><span class="identifier">record_view</span><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;&amp;</span> that<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
  83 <p>Move constructor. Source record contents unspecified after the operation. </p>
  84 </li>
  85 <li class="listitem">
  86 <pre class="literallayout"><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;</span> <a name="idm45711350380032-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="keyword">const</span> <span class="special">&amp;</span> that<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
  87 <p>Copy assignment </p>
  88 </li>
  89 <li class="listitem">
  90 <pre class="literallayout"><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;</span> <a name="idm45711350377504-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;&amp;</span> that<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
  91 <p>Move assignment. Source record contents unspecified after the operation. </p>
  92 </li>
  93 <li class="listitem">
  94 <pre class="literallayout"><a name="idm45711350380832-bb"></a><span class="special">~</span><span class="identifier">record_view</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  95 <p>Destructor. Destroys the record, releases any sinks and attribute values that were involved in processing this record. </p>
  96 </li>
  97 </ol></div>
  98 </div>
  99 <div class="refsect2">
 100 <a name="idm45554755534448"></a><h3>
 101 <a name="idm45711350425552-bb"></a><code class="computeroutput">record_view</code> public member functions</h3>
 102 <div class="orderedlist"><ol class="orderedlist" type="1">
 103 <li class="listitem">
 104 <pre class="literallayout"><span class="identifier">attribute_value_set</span> <span class="keyword">const</span>  <span class="special">&amp;</span> <a name="idm45711350424992-bb"></a><span class="identifier">attribute_values</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 105 <p>
 106
 107 </p>
 108 <div class="variablelist"><table border="0" class="variablelist compact">
 109 <colgroup>
 110 <col align="left" valign="top">
 111 <col>
 112 </colgroup>
 113 <tbody>
 114 <tr>
 115 <td><p><span class="term">Requires:</span></p></td>
 116 <td><p><code class="computeroutput">!!*this</code> </p></td>
 117 </tr>
 118 <tr>
 119 <td><p><span class="term">Returns:</span></p></td>
 120 <td><p>A reference to the set of attribute values attached to this record</p></td>
 121 </tr>
 122 </tbody>
 123 </table></div>
 124 </li>
 125 <li class="listitem">
 126 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45711350421952-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="keyword">const</span> <span class="special">&amp;</span> that<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 127 <p>Equality comparison</p>
 128 <p>
 129
 130 </p>
 131 <div class="variablelist"><table border="0" class="variablelist compact">
 132 <colgroup>
 133 <col align="left" valign="top">
 134 <col>
 135 </colgroup>
 136 <tbody>
 137 <tr>
 138 <td><p><span class="term">Parameters:</span></p></td>
 139 <td><div class="variablelist"><table border="0" class="variablelist compact">
 140 <colgroup>
 141 <col align="left" valign="top">
 142 <col>
 143 </colgroup>
 144 <tbody><tr>
 145 <td><p><span class="term"><code class="computeroutput">that</code></span></p></td>
 146 <td><p>Comparand </p></td>
 147 </tr></tbody>
 148 </table></div></td>
 149 </tr>
 150 <tr>
 151 <td><p><span class="term">Returns:</span></p></td>
 152 <td><p><code class="computeroutput">true</code> if both <code class="computeroutput">*this</code> and <span class="emphasis"><em>that</em></span> identify the same log record or both do not identify any record, <code class="computeroutput">false</code> otherwise. </p></td>
 153 </tr>
 154 </tbody>
 155 </table></div>
 156 </li>
 157 <li class="listitem">
 158 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45711350416480-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="keyword">const</span> <span class="special">&amp;</span> that<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 159 <p>Inequality comparison</p>
 160 <p>
 161
 162 </p>
 163 <div class="variablelist"><table border="0" class="variablelist compact">
 164 <colgroup>
 165 <col align="left" valign="top">
 166 <col>
 167 </colgroup>
 168 <tbody>
 169 <tr>
 170 <td><p><span class="term">Parameters:</span></p></td>
 171 <td><div class="variablelist"><table border="0" class="variablelist compact">
 172 <colgroup>
 173 <col align="left" valign="top">
 174 <col>
 175 </colgroup>
 176 <tbody><tr>
 177 <td><p><span class="term"><code class="computeroutput">that</code></span></p></td>
 178 <td><p>Comparand </p></td>
 179 </tr></tbody>
 180 </table></div></td>
 181 </tr>
 182 <tr>
 183 <td><p><span class="term">Returns:</span></p></td>
 184 <td><p><code class="computeroutput">!(*this == that)</code> </p></td>
 185 </tr>
 186 </tbody>
 187 </table></div>
 188 </li>
 189 <li class="listitem">
 190 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45711350412400-bb"></a><span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 191 <p>Conversion to an unspecified boolean type</p>
 192 <p>
 193 </p>
 194 <div class="variablelist"><table border="0" class="variablelist compact">
 195 <colgroup>
 196 <col align="left" valign="top">
 197 <col>
 198 </colgroup>
 199 <tbody><tr>
 200 <td><p><span class="term">Returns:</span></p></td>
 201 <td><p><code class="computeroutput">true</code>, if the <code class="computeroutput">*this</code> identifies a log record, <code class="computeroutput">false</code>, if the <code class="computeroutput">*this</code> is not valid </p></td>
 202 </tr></tbody>
 203 </table></div>
 204 </li>
 205 <li class="listitem">
 206 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45711350408048-bb"></a><span class="keyword">operator</span><span class="special">!</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 207 <p>Inverted conversion to an unspecified boolean type</p>
 208 <p>
 209 </p>
 210 <div class="variablelist"><table border="0" class="variablelist compact">
 211 <colgroup>
 212 <col align="left" valign="top">
 213 <col>
 214 </colgroup>
 215 <tbody><tr>
 216 <td><p><span class="term">Returns:</span></p></td>
 217 <td><p><code class="computeroutput">false</code>, if the <code class="computeroutput">*this</code> identifies a log record, <code class="computeroutput">true</code>, if the <code class="computeroutput">*this</code> is not valid </p></td>
 218 </tr></tbody>
 219 </table></div>
 220 </li>
 221 <li class="listitem">
 222 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45711350403968-bb"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="record_view.html" title="Class record_view">record_view</a> <span class="special">&amp;</span> that<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 223 <p>Swaps two handles</p>
 224 <p>
 225 </p>
 226 <div class="variablelist"><table border="0" class="variablelist compact">
 227 <colgroup>
 228 <col align="left" valign="top">
 229 <col>
 230 </colgroup>
 231 <tbody><tr>
 232 <td><p><span class="term">Parameters:</span></p></td>
 233 <td><div class="variablelist"><table border="0" class="variablelist compact">
 234 <colgroup>
 235 <col align="left" valign="top">
 236 <col>
 237 </colgroup>
 238 <tbody><tr>
 239 <td><p><span class="term"><code class="computeroutput">that</code></span></p></td>
 240 <td><p>Another record to swap with <span class="bold"><strong>Throws:</strong></span> Nothing </p></td>
 241 </tr></tbody>
 242 </table></div></td>
 243 </tr></tbody>
 244 </table></div>
 245 </li>
 246 <li class="listitem">
 247 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45711350400016-bb"></a><span class="identifier">reset</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 248 <p>Resets the log record handle. If there are no other handles left, the log record is closed and all resources referenced by the record are released.</p>
 249 <p>
 250 </p>
 251 <div class="variablelist"><table border="0" class="variablelist compact">
 252 <colgroup>
 253 <col align="left" valign="top">
 254 <col>
 255 </colgroup>
 256 <tbody><tr>
 257 <td><p><span class="term">Postconditions:</span></p></td>
 258 <td><p><code class="computeroutput">!*this == true</code> </p></td>
 259 </tr></tbody>
 260 </table></div>
 261 </li>
 262 <li class="listitem">
 263 <pre class="literallayout"><span class="identifier">attribute_value_set</span><span class="special">::</span><span class="identifier">mapped_type</span>
 264 <a name="idm45711350397200-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">attribute_value_set</span><span class="special">::</span><span class="identifier">key_type</span> name<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 265 <p>Attribute value lookup.</p>
 266 <p>
 267
 268 </p>
 269 <div class="variablelist"><table border="0" class="variablelist compact">
 270 <colgroup>
 271 <col align="left" valign="top">
 272 <col>
 273 </colgroup>
 274 <tbody>
 275 <tr>
 276 <td><p><span class="term">Parameters:</span></p></td>
 277 <td><div class="variablelist"><table border="0" class="variablelist compact">
 278 <colgroup>
 279 <col align="left" valign="top">
 280 <col>
 281 </colgroup>
 282 <tbody><tr>
 283 <td><p><span class="term"><code class="computeroutput">name</code></span></p></td>
 284 <td><p>Attribute name. </p></td>
 285 </tr></tbody>
 286 </table></div></td>
 287 </tr>
 288 <tr>
 289 <td><p><span class="term">Returns:</span></p></td>
 290 <td><p>An <code class="computeroutput">attribute_value</code>, non-empty if it is found, empty otherwise. </p></td>
 291 </tr>
 292 </tbody>
 293 </table></div>
 294 </li>
 295 <li class="listitem">
 296 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">&gt;</span>
 297   <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">extract</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 298   <a name="idm45711350393184-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> keyword<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 299 <p>Attribute value lookup.</p>
 300 <p>
 301
 302 </p>
 303 <div class="variablelist"><table border="0" class="variablelist compact">
 304 <colgroup>
 305 <col align="left" valign="top">
 306 <col>
 307 </colgroup>
 308 <tbody>
 309 <tr>
 310 <td><p><span class="term">Parameters:</span></p></td>
 311 <td><div class="variablelist"><table border="0" class="variablelist compact">
 312 <colgroup>
 313 <col align="left" valign="top">
 314 <col>
 315 </colgroup>
 316 <tbody><tr>
 317 <td><p><span class="term"><code class="computeroutput">keyword</code></span></p></td>
 318 <td><p>Attribute keyword. </p></td>
 319 </tr></tbody>
 320 </table></div></td>
 321 </tr>
 322 <tr>
 323 <td><p><span class="term">Returns:</span></p></td>
 324 <td><p>A <code class="computeroutput">value_ref</code> with extracted attribute value if it is found, empty <code class="computeroutput">value_ref</code> otherwise. </p></td>
 325 </tr>
 326 </tbody>
 327 </table></div>
 328 </li>
 329 </ol></div>
 330 </div>
 331 </div>
 332 </div>
 333 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 334 <td align="left"></td>
 335 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
 336         Distributed under the Boost Software License, Version 1.0. (See accompanying
 337         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>).
 338       </p>
 339 </div></td>
 340 </tr></table>
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