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<div class="title">echo_server_direct.cpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// echo_server.cpp</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// ~~~~~~~~~~~~~~~</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// Distributed under the Boost Software License, Version 1.0. (See accompanying</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <cstdio></span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/asio.hpp></span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>net = boost::asio;</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>this_coro = net::this_coro;</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">using</span> net::ip::tcp;</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">using</span> net::detached;</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">using</span> executor_type = net::io_context::executor_type;</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">using</span> socket_type = net::basic_stream_socket<net::ip::tcp, executor_type>;</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">using</span> tcp_socket = net::use_awaitable_t<executor_type>::as_default_on_t<socket_type>;</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">using</span> acceptor_type = net::basic_socket_acceptor<net::ip::tcp, executor_type>;</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">using</span> tcp_acceptor = net::use_awaitable_t<executor_type>::as_default_on_t<acceptor_type>;</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">using</span> awaitable_type = net::awaitable<void, executor_type>;</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> constexpr net::use_awaitable_t<executor_type> use_awaitable;</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  </div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> awaitable_type echo(tcp_socket socket)</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> {</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">try</span> {</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordtype">char</span> data[1024];</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">for</span> (;;) {</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  std::size_t n = co_await socket.async_read_some(net::buffer(data), use_awaitable);</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  co_await async_write(socket, net::buffer(data, n), use_awaitable);</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  }</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  } <span class="keywordflow">catch</span> (std::exception <span class="keyword">const</span>& e) {</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">//std::printf("echo Exception: %s\n", e.what());</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  }</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> }</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> awaitable_type listener()</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">auto</span> ex = co_await this_coro::executor;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  tcp_acceptor acceptor(ex, {tcp::v4(), 55555});</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">for</span> (;;) {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  tcp_socket socket = co_await acceptor.async_accept(use_awaitable);</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  co_spawn(ex, echo(std::move(socket)), detached);</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> }</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="keywordtype">int</span> main()</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">try</span> {</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  net::io_context io_context{BOOST_ASIO_CONCURRENCY_HINT_UNSAFE_IO};</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  co_spawn(io_context, listener(), detached);</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  io_context.run();</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  } <span class="keywordflow">catch</span> (std::exception <span class="keyword">const</span>& e) {</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  std::printf(<span class="stringliteral">"Exception: %s\n"</span>, e.what());</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  }</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> }</div>
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