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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_asio.reference.basic_waitable_timer"></a><a class="link" href="basic_waitable_timer.html" title="basic_waitable_timer">basic_waitable_timer</a>
  28 </h3></div></div></div>
  29 <p>
  30         Provides waitable timer functionality.
  31       </p>
  32 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
  33     <span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">,</span>
  34     <span class="keyword">typename</span> <a class="link" href="WaitTraits.html" title="Wait traits requirements">WaitTraits</a> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">wait_traits</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">&gt;,</span>
  35     <span class="keyword">typename</span> <a class="link" href="WaitableTimerService.html" title="Waitable timer service requirements">WaitableTimerService</a> <span class="special">=</span> <span class="identifier">waitable_timer_service</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">WaitTraits</span><span class="special">&gt;&gt;</span>
  36 <span class="keyword">class</span> <span class="identifier">basic_waitable_timer</span> <span class="special">:</span>
  37   <span class="keyword">public</span> <span class="identifier">basic_io_object</span><span class="special">&lt;</span> <span class="identifier">WaitableTimerService</span> <span class="special">&gt;</span>
  38 </pre>
  39 <h5>
  40 <a name="boost_asio.reference.basic_waitable_timer.h0"></a>
  41         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.types"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.types">Types</a>
  42       </h5>
  43 <div class="informaltable"><table class="table">
  44 <colgroup>
  45 <col>
  46 <col>
  47 </colgroup>
  48 <thead><tr>
  49 <th>
  50                 <p>
  51                   Name
  52                 </p>
  53               </th>
  54 <th>
  55                 <p>
  56                   Description
  57                 </p>
  58               </th>
  59 </tr></thead>
  60 <tbody>
  61 <tr>
  62 <td>
  63                 <p>
  64                   <a class="link" href="basic_waitable_timer/clock_type.html" title="basic_waitable_timer::clock_type"><span class="bold"><strong>clock_type</strong></span></a>
  65                 </p>
  66               </td>
  67 <td>
  68                 <p>
  69                   The clock type.
  70                 </p>
  71               </td>
  72 </tr>
  73 <tr>
  74 <td>
  75                 <p>
  76                   <a class="link" href="basic_waitable_timer/duration.html" title="basic_waitable_timer::duration"><span class="bold"><strong>duration</strong></span></a>
  77                 </p>
  78               </td>
  79 <td>
  80                 <p>
  81                   The duration type of the clock.
  82                 </p>
  83               </td>
  84 </tr>
  85 <tr>
  86 <td>
  87                 <p>
  88                   <a class="link" href="basic_waitable_timer/implementation_type.html" title="basic_waitable_timer::implementation_type"><span class="bold"><strong>implementation_type</strong></span></a>
  89                 </p>
  90               </td>
  91 <td>
  92                 <p>
  93                   The underlying implementation type of I/O object.
  94                 </p>
  95               </td>
  96 </tr>
  97 <tr>
  98 <td>
  99                 <p>
 100                   <a class="link" href="basic_waitable_timer/service_type.html" title="basic_waitable_timer::service_type"><span class="bold"><strong>service_type</strong></span></a>
 101                 </p>
 102               </td>
 103 <td>
 104                 <p>
 105                   The type of the service that will be used to provide I/O operations.
 106                 </p>
 107               </td>
 108 </tr>
 109 <tr>
 110 <td>
 111                 <p>
 112                   <a class="link" href="basic_waitable_timer/time_point.html" title="basic_waitable_timer::time_point"><span class="bold"><strong>time_point</strong></span></a>
 113                 </p>
 114               </td>
 115 <td>
 116                 <p>
 117                   The time point type of the clock.
 118                 </p>
 119               </td>
 120 </tr>
 121 <tr>
 122 <td>
 123                 <p>
 124                   <a class="link" href="basic_waitable_timer/traits_type.html" title="basic_waitable_timer::traits_type"><span class="bold"><strong>traits_type</strong></span></a>
 125                 </p>
 126               </td>
 127 <td>
 128                 <p>
 129                   The wait traits type.
 130                 </p>
 131               </td>
 132 </tr>
 133 </tbody>
 134 </table></div>
 135 <h5>
 136 <a name="boost_asio.reference.basic_waitable_timer.h1"></a>
 137         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.member_functions"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.member_functions">Member
 138         Functions</a>
 139       </h5>
 140 <div class="informaltable"><table class="table">
 141 <colgroup>
 142 <col>
 143 <col>
 144 </colgroup>
 145 <thead><tr>
 146 <th>
 147                 <p>
 148                   Name
 149                 </p>
 150               </th>
 151 <th>
 152                 <p>
 153                   Description
 154                 </p>
 155               </th>
 156 </tr></thead>
 157 <tbody>
 158 <tr>
 159 <td>
 160                 <p>
 161                   <a class="link" href="basic_waitable_timer/async_wait.html" title="basic_waitable_timer::async_wait"><span class="bold"><strong>async_wait</strong></span></a>
 162                 </p>
 163               </td>
 164 <td>
 165                 <p>
 166                   Start an asynchronous wait on the timer.
 167                 </p>
 168               </td>
 169 </tr>
 170 <tr>
 171 <td>
 172                 <p>
 173                   <a class="link" href="basic_waitable_timer/basic_waitable_timer.html" title="basic_waitable_timer::basic_waitable_timer"><span class="bold"><strong>basic_waitable_timer</strong></span></a>
 174                 </p>
 175               </td>
 176 <td>
 177                 <p>
 178                   Constructor.
 179                 </p>
 180                 <p>
 181                   Constructor to set a particular expiry time as an absolute time.
 182                 </p>
 183                 <p>
 184                   Constructor to set a particular expiry time relative to now.
 185                 </p>
 186               </td>
 187 </tr>
 188 <tr>
 189 <td>
 190                 <p>
 191                   <a class="link" href="basic_waitable_timer/cancel.html" title="basic_waitable_timer::cancel"><span class="bold"><strong>cancel</strong></span></a>
 192                 </p>
 193               </td>
 194 <td>
 195                 <p>
 196                   Cancel any asynchronous operations that are waiting on the timer.
 197                 </p>
 198               </td>
 199 </tr>
 200 <tr>
 201 <td>
 202                 <p>
 203                   <a class="link" href="basic_waitable_timer/cancel_one.html" title="basic_waitable_timer::cancel_one"><span class="bold"><strong>cancel_one</strong></span></a>
 204                 </p>
 205               </td>
 206 <td>
 207                 <p>
 208                   Cancels one asynchronous operation that is waiting on the timer.
 209                 </p>
 210               </td>
 211 </tr>
 212 <tr>
 213 <td>
 214                 <p>
 215                   <a class="link" href="basic_waitable_timer/expires_at.html" title="basic_waitable_timer::expires_at"><span class="bold"><strong>expires_at</strong></span></a>
 216                 </p>
 217               </td>
 218 <td>
 219                 <p>
 220                   Get the timer's expiry time as an absolute time.
 221                 </p>
 222                 <p>
 223                   Set the timer's expiry time as an absolute time.
 224                 </p>
 225               </td>
 226 </tr>
 227 <tr>
 228 <td>
 229                 <p>
 230                   <a class="link" href="basic_waitable_timer/expires_from_now.html" title="basic_waitable_timer::expires_from_now"><span class="bold"><strong>expires_from_now</strong></span></a>
 231                 </p>
 232               </td>
 233 <td>
 234                 <p>
 235                   Get the timer's expiry time relative to now.
 236                 </p>
 237                 <p>
 238                   Set the timer's expiry time relative to now.
 239                 </p>
 240               </td>
 241 </tr>
 242 <tr>
 243 <td>
 244                 <p>
 245                   <a class="link" href="basic_waitable_timer/get_io_service.html" title="basic_waitable_timer::get_io_service"><span class="bold"><strong>get_io_service</strong></span></a>
 246                 </p>
 247               </td>
 248 <td>
 249                 <p>
 250                   Get the io_service associated with the object.
 251                 </p>
 252               </td>
 253 </tr>
 254 <tr>
 255 <td>
 256                 <p>
 257                   <a class="link" href="basic_waitable_timer/wait.html" title="basic_waitable_timer::wait"><span class="bold"><strong>wait</strong></span></a>
 258                 </p>
 259               </td>
 260 <td>
 261                 <p>
 262                   Perform a blocking wait on the timer.
 263                 </p>
 264               </td>
 265 </tr>
 266 </tbody>
 267 </table></div>
 268 <h5>
 269 <a name="boost_asio.reference.basic_waitable_timer.h2"></a>
 270         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.protected_member_functions"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.protected_member_functions">Protected
 271         Member Functions</a>
 272       </h5>
 273 <div class="informaltable"><table class="table">
 274 <colgroup>
 275 <col>
 276 <col>
 277 </colgroup>
 278 <thead><tr>
 279 <th>
 280                 <p>
 281                   Name
 282                 </p>
 283               </th>
 284 <th>
 285                 <p>
 286                   Description
 287                 </p>
 288               </th>
 289 </tr></thead>
 290 <tbody>
 291 <tr>
 292 <td>
 293                 <p>
 294                   <a class="link" href="basic_waitable_timer/get_implementation.html" title="basic_waitable_timer::get_implementation"><span class="bold"><strong>get_implementation</strong></span></a>
 295                 </p>
 296               </td>
 297 <td>
 298                 <p>
 299                   Get the underlying implementation of the I/O object.
 300                 </p>
 301               </td>
 302 </tr>
 303 <tr>
 304 <td>
 305                 <p>
 306                   <a class="link" href="basic_waitable_timer/get_service.html" title="basic_waitable_timer::get_service"><span class="bold"><strong>get_service</strong></span></a>
 307                 </p>
 308               </td>
 309 <td>
 310                 <p>
 311                   Get the service associated with the I/O object.
 312                 </p>
 313               </td>
 314 </tr>
 315 </tbody>
 316 </table></div>
 317 <h5>
 318 <a name="boost_asio.reference.basic_waitable_timer.h3"></a>
 319         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.protected_data_members"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.protected_data_members">Protected
 320         Data Members</a>
 321       </h5>
 322 <div class="informaltable"><table class="table">
 323 <colgroup>
 324 <col>
 325 <col>
 326 </colgroup>
 327 <thead><tr>
 328 <th>
 329                 <p>
 330                   Name
 331                 </p>
 332               </th>
 333 <th>
 334                 <p>
 335                   Description
 336                 </p>
 337               </th>
 338 </tr></thead>
 339 <tbody>
 340 <tr>
 341 <td>
 342                 <p>
 343                   <a class="link" href="basic_waitable_timer/implementation.html" title="basic_waitable_timer::implementation"><span class="bold"><strong>implementation</strong></span></a>
 344                 </p>
 345               </td>
 346 <td>
 347                 <p>
 348                   (Deprecated: Use get_implementation().) The underlying implementation
 349                   of the I/O object.
 350                 </p>
 351               </td>
 352 </tr>
 353 <tr>
 354 <td>
 355                 <p>
 356                   <a class="link" href="basic_waitable_timer/service.html" title="basic_waitable_timer::service"><span class="bold"><strong>service</strong></span></a>
 357                 </p>
 358               </td>
 359 <td>
 360                 <p>
 361                   (Deprecated: Use get_service().) The service associated with the
 362                   I/O object.
 363                 </p>
 364               </td>
 365 </tr>
 366 </tbody>
 367 </table></div>
 368 <p>
 369         The <a class="link" href="basic_waitable_timer.html" title="basic_waitable_timer"><code class="computeroutput"><span class="identifier">basic_waitable_timer</span></code></a> class template
 370         provides the ability to perform a blocking or asynchronous wait for a timer
 371         to expire.
 372       </p>
 373 <p>
 374         A waitable timer is always in one of two states: "expired" or "not
 375         expired". If the <code class="computeroutput"><span class="identifier">wait</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">async_wait</span><span class="special">()</span></code> function is called on an expired timer,
 376         the wait operation will complete immediately.
 377       </p>
 378 <p>
 379         Most applications will use one of the <a class="link" href="steady_timer.html" title="steady_timer"><code class="computeroutput"><span class="identifier">steady_timer</span></code></a>, <a class="link" href="system_timer.html" title="system_timer"><code class="computeroutput"><span class="identifier">system_timer</span></code></a> or <a class="link" href="high_resolution_timer.html" title="high_resolution_timer"><code class="computeroutput"><span class="identifier">high_resolution_timer</span></code></a> typedefs.
 380       </p>
 381 <h5>
 382 <a name="boost_asio.reference.basic_waitable_timer.h4"></a>
 383         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.remarks"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.remarks">Remarks</a>
 384       </h5>
 385 <p>
 386         This waitable timer functionality is for use with the C++11 standard library's
 387         <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">chrono</span><span class="special">&gt;</span></code> facility, or with the Boost.Chrono library.
 388       </p>
 389 <h5>
 390 <a name="boost_asio.reference.basic_waitable_timer.h5"></a>
 391         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.thread_safety"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.thread_safety">Thread
 392         Safety</a>
 393       </h5>
 394 <p>
 395         <span class="emphasis"><em>Distinct</em></span> <span class="emphasis"><em>objects:</em></span> Safe.
 396       </p>
 397 <p>
 398         <span class="emphasis"><em>Shared</em></span> <span class="emphasis"><em>objects:</em></span> Unsafe.
 399       </p>
 400 <h5>
 401 <a name="boost_asio.reference.basic_waitable_timer.h6"></a>
 402         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.examples"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.examples">Examples</a>
 403       </h5>
 404 <p>
 405         Performing a blocking wait (C++11):
 406       </p>
 407 <pre class="programlisting"><span class="comment">// Construct a timer without setting an expiry time.</span>
 408 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span> <span class="identifier">timer</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span>
 409
 410 <span class="comment">// Set an expiry time relative to now.</span>
 411 <span class="identifier">timer</span><span class="special">.</span><span class="identifier">expires_from_now</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">5</span><span class="special">));</span>
 412
 413 <span class="comment">// Wait for the timer to expire.</span>
 414 <span class="identifier">timer</span><span class="special">.</span><span class="identifier">wait</span><span class="special">();</span>
 415 </pre>
 416 <p>
 417         Performing an asynchronous wait (C++11):
 418       </p>
 419 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">)</span>
 420 <span class="special">{</span>
 421   <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span class="special">)</span>
 422   <span class="special">{</span>
 423     <span class="comment">// Timer expired.</span>
 424   <span class="special">}</span>
 425 <span class="special">}</span>
 426
 427 <span class="special">...</span>
 428
 429 <span class="comment">// Construct a timer with an absolute expiry time.</span>
 430 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span> <span class="identifier">timer</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">,</span>
 431     <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">steady_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">60</span><span class="special">));</span>
 432
 433 <span class="comment">// Start an asynchronous wait.</span>
 434 <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">handler</span><span class="special">);</span>
 435 </pre>
 436 <h5>
 437 <a name="boost_asio.reference.basic_waitable_timer.h7"></a>
 438         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.changing_an_active_waitable_timer_s_expiry_time"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.changing_an_active_waitable_timer_s_expiry_time">Changing
 439         an active waitable timer's expiry time</a>
 440       </h5>
 441 <p>
 442         Changing the expiry time of a timer while there are pending asynchronous
 443         waits causes those wait operations to be cancelled. To ensure that the action
 444         associated with the timer is performed only once, use something like this:
 445         used:
 446       </p>
 447 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">on_some_event</span><span class="special">()</span>
 448 <span class="special">{</span>
 449   <span class="keyword">if</span> <span class="special">(</span><span class="identifier">my_timer</span><span class="special">.</span><span class="identifier">expires_from_now</span><span class="special">(</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">5</span><span class="special">))</span> <span class="special">&gt;</span> <span class="number">0</span><span class="special">)</span>
 450   <span class="special">{</span>
 451     <span class="comment">// We managed to cancel the timer. Start new asynchronous wait.</span>
 452     <span class="identifier">my_timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">on_timeout</span><span class="special">);</span>
 453   <span class="special">}</span>
 454   <span class="keyword">else</span>
 455   <span class="special">{</span>
 456     <span class="comment">// Too late, timer has already expired!</span>
 457   <span class="special">}</span>
 458 <span class="special">}</span>
 459
 460 <span class="keyword">void</span> <span class="identifier">on_timeout</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">e</span><span class="special">)</span>
 461 <span class="special">{</span>
 462   <span class="keyword">if</span> <span class="special">(</span><span class="identifier">e</span> <span class="special">!=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">operation_aborted</span><span class="special">)</span>
 463   <span class="special">{</span>
 464     <span class="comment">// Timer was not cancelled, take necessary action.</span>
 465   <span class="special">}</span>
 466 <span class="special">}</span>
 467 </pre>
 468 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 469 <li class="listitem">
 470             The <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">basic_waitable_timer</span><span class="special">::</span><span class="identifier">expires_from_now</span><span class="special">()</span></code>
 471             function cancels any pending asynchronous waits, and returns the number
 472             of asynchronous waits that were cancelled. If it returns 0 then you were
 473             too late and the wait handler has already been executed, or will soon
 474             be executed. If it returns 1 then the wait handler was successfully cancelled.
 475           </li>
 476 <li class="listitem">
 477             If a wait handler is cancelled, the boost::system::error_code passed
 478             to it contains the value <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">operation_aborted</span></code>.
 479           </li>
 480 </ul></div>
 481 <h5>
 482 <a name="boost_asio.reference.basic_waitable_timer.h8"></a>
 483         <span class="phrase"><a name="boost_asio.reference.basic_waitable_timer.requirements"></a></span><a class="link" href="basic_waitable_timer.html#boost_asio.reference.basic_waitable_timer.requirements">Requirements</a>
 484       </h5>
 485 <p>
 486         <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/basic_waitable_timer.hpp</code>
 487       </p>
 488 <p>
 489         <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
 490       </p>
 491 </div>
 492 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 493 <td align="left"></td>
 494 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2014 Christopher M. Kohlhoff<p>
 495         Distributed under the Boost Software License, Version 1.0. (See accompanying
 496         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>)
 497       </p>
 498 </div></td>
 499 </tr></table>
 500 <hr>
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