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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_asio.overview.cpp2011.chrono"></a><a class="link" href="chrono.html" title="Chrono">Chrono</a> |
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| <p> |
| Boost.Asio provides timers based on the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span></code> |
| facilities via the <a class="link" href="../../reference/basic_waitable_timer.html" title="basic_waitable_timer">basic_waitable_timer</a> |
| class template. The typedefs <a class="link" href="../../reference/system_timer.html" title="system_timer">system_timer</a>, |
| <a class="link" href="../../reference/steady_timer.html" title="steady_timer">steady_timer</a> and |
| <a class="link" href="../../reference/high_resolution_timer.html" title="high_resolution_timer">high_resolution_timer</a> |
| utilise the standard clocks <code class="computeroutput"><span class="identifier">system_clock</span></code>, |
| <code class="computeroutput"><span class="identifier">steady_clock</span></code> and <code class="computeroutput"><span class="identifier">high_resolution_clock</span></code> respectively. |
| </p> |
| <p> |
| Support for the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span></code> facilities is automatically enabled |
| for <code class="literal">g++</code> 4.6 and later, when the <code class="literal">-std=c++0x</code> |
| or <code class="literal">-std=gnu++0x</code> compiler options are used. (Note that, |
| for <code class="literal">g++</code>, the draft-standard <code class="computeroutput"><span class="identifier">monotonic_clock</span></code> |
| is used in place of <code class="computeroutput"><span class="identifier">steady_clock</span></code>.) |
| Support may be disabled by defining <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_STD_CHRONO</span></code>, |
| or explicitly enabled for other compilers by defining <code class="computeroutput"><span class="identifier">BOOST_ASIO_HAS_STD_CHRONO</span></code>. |
| </p> |
| <p> |
| When standard <code class="computeroutput"><span class="identifier">chrono</span></code> is |
| unavailable, Boost.Asio will otherwise use the Boost.Chrono library. The |
| <a class="link" href="../../reference/basic_waitable_timer.html" title="basic_waitable_timer">basic_waitable_timer</a> |
| class template may be used with either. |
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| <td align="right"><div class="copyright-footer">Copyright © 2003-2015 Christopher M. |
| Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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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