57 lines
4.4 KiB
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57 lines
4.4 KiB
HTML
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Chrono</title>
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
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<div class="section">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="asio.overview.cpp2011.chrono"></a><a class="link" href="chrono.html" title="Chrono">Chrono</a>
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</h4></div></div></div>
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<p>
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Asio provides timers based on the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span></code>
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facilities via the <a class="link" href="../../reference/basic_waitable_timer.html" title="basic_waitable_timer">basic_waitable_timer</a>
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class template. The typedefs <a class="link" href="../../reference/system_timer.html" title="system_timer">system_timer</a>,
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<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>
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utilise the standard clocks <code class="computeroutput"><span class="identifier">system_clock</span></code>,
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<code class="computeroutput"><span class="identifier">steady_clock</span></code> and <code class="computeroutput"><span class="identifier">high_resolution_clock</span></code> respectively.
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</p>
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<p>
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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
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for <code class="literal">g++</code> 4.6 and later, when the <code class="literal">-std=c++0x</code>
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or <code class="literal">-std=gnu++0x</code> compiler options are used. (Note that,
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for <code class="literal">g++</code>, the draft-standard <code class="computeroutput"><span class="identifier">monotonic_clock</span></code>
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is used in place of <code class="computeroutput"><span class="identifier">steady_clock</span></code>.)
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Support may be disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_STD_CHRONO</span></code>,
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or explicitly enabled for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_STD_CHRONO</span></code>.
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</p>
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<p>
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When standard <code class="computeroutput"><span class="identifier">chrono</span></code> is
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unavailable, 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>
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class template may be used with either.
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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