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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_asio.tutorial.tuttimer4.src"></a><a class="link" href="src.html" title="Source listing for Timer.4">Source listing for
  28         Timer.4</a>
  29 </h4></div></div></div>
  30 <pre class="programlisting"><span class="comment">//</span>
  31 <span class="comment">// timer.cpp</span>
  32 <span class="comment">// ~~~~~~~~~</span>
  33 <span class="comment">//</span>
  34 <span class="comment">// Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)</span>
  35 <span class="comment">//</span>
  36 <span class="comment">// Distributed under the Boost Software License, Version 1.0. (See accompanying</span>
  37 <span class="comment">// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)</span>
  38 <span class="comment">//</span>
  39
  40 <span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
  41 <span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">asio</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  42 <span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">bind</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  43 <span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">date_time</span><span class="special">/</span><span class="identifier">posix_time</span><span class="special">/</span><span class="identifier">posix_time</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  44
  45 <span class="keyword">class</span> <span class="identifier">printer</span>
  46 <span class="special">{</span>
  47 <span class="keyword">public</span><span class="special">:</span>
  48   <span class="identifier">printer</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">io_service</span><span class="special">&amp;</span> <span class="identifier">io</span><span class="special">)</span>
  49     <span class="special">:</span> <span class="identifier">timer_</span><span class="special">(</span><span class="identifier">io</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">1</span><span class="special">)),</span>
  50       <span class="identifier">count_</span><span class="special">(</span><span class="number">0</span><span class="special">)</span>
  51   <span class="special">{</span>
  52     <span class="identifier">timer_</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">printer</span><span class="special">::</span><span class="identifier">print</span><span class="special">,</span> <span class="keyword">this</span><span class="special">));</span>
  53   <span class="special">}</span>
  54
  55   <span class="special">~</span><span class="identifier">printer</span><span class="special">()</span>
  56   <span class="special">{</span>
  57     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Final count is "</span> <span class="special">&lt;&lt;</span> <span class="identifier">count_</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  58   <span class="special">}</span>
  59
  60   <span class="keyword">void</span> <span class="identifier">print</span><span class="special">()</span>
  61   <span class="special">{</span>
  62     <span class="keyword">if</span> <span class="special">(</span><span class="identifier">count_</span> <span class="special">&lt;</span> <span class="number">5</span><span class="special">)</span>
  63     <span class="special">{</span>
  64       <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">count_</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  65       <span class="special">++</span><span class="identifier">count_</span><span class="special">;</span>
  66
  67       <span class="identifier">timer_</span><span class="special">.</span><span class="identifier">expires_at</span><span class="special">(</span><span class="identifier">timer_</span><span class="special">.</span><span class="identifier">expires_at</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">1</span><span class="special">));</span>
  68       <span class="identifier">timer_</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">printer</span><span class="special">::</span><span class="identifier">print</span><span class="special">,</span> <span class="keyword">this</span><span class="special">));</span>
  69     <span class="special">}</span>
  70   <span class="special">}</span>
  71
  72 <span class="keyword">private</span><span class="special">:</span>
  73   <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">deadline_timer</span> <span class="identifier">timer_</span><span class="special">;</span>
  74   <span class="keyword">int</span> <span class="identifier">count_</span><span class="special">;</span>
  75 <span class="special">};</span>
  76
  77 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
  78 <span class="special">{</span>
  79   <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span> <span class="identifier">io</span><span class="special">;</span>
  80   <span class="identifier">printer</span> <span class="identifier">p</span><span class="special">(</span><span class="identifier">io</span><span class="special">);</span>
  81   <span class="identifier">io</span><span class="special">.</span><span class="identifier">run</span><span class="special">();</span>
  82
  83   <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
  84 <span class="special">}</span>
  85 </pre>
  86 <p>
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  89         </p>
  90 </div>
  91 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  92 <td align="left"></td>
  93 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2017 Christopher M. Kohlhoff<p>
  94         Distributed under the Boost Software License, Version 1.0. (See accompanying
  95         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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