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26 <div class="titlepage"><div><div><h3 class="title">
27 <a name="boost_asio.reference.Protocol"></a><a class="link" href="Protocol.html" title="Protocol requirements">Protocol requirements</a>
28 </h3></div></div></div>
29 <p>
30         A type <code class="computeroutput">X</code> meets the <code class="computeroutput">Protocol</code> requirements if it
31         satisfies the requirements of <code class="computeroutput">Destructible</code> (C++Std [destructible]),
32         <code class="computeroutput">CopyConstructible</code> (C++Std [copyconstructible]), and <code class="computeroutput">CopyAssignable</code>
33         (C++Std [copyassignable]), as well as the additional requirements listed
34         below.
35       </p>
36 <p>
37         No copy or move operation of the type <code class="computeroutput">X</code> shall exit via an exception.
38       </p>
39 <div class="table">
40 <a name="boost_asio.reference.Protocol.t0"></a><p class="title"><b>Table&#160;23.&#160;Protocol requirements</b></p>
41 <div class="table-contents"><table class="table" summary="Protocol requirements">
42 <colgroup>
43 <col>
44 <col>
45 <col>
46 </colgroup>
47 <thead><tr>
48 <th>
49                 <p>
50                   expression
51                 </p>
52               </th>
53 <th>
54                 <p>
55                   return type
56                 </p>
57               </th>
58 <th>
59                 <p>
60                   assertion/note<br> pre/post-conditions
61                 </p>
62               </th>
63 </tr></thead>
64 <tbody><tr>
65 <td>
66                 <p>
67                   <code class="computeroutput">X::endpoint</code>
68                 </p>
69               </td>
70 <td>
71                 <p>
72                   type meeting <a class="link" href="Endpoint.html" title="Endpoint requirements">endpoint</a>
73                   requirements
74                 </p>
75               </td>
76 <td>
77               </td>
78 </tr></tbody>
79 </table></div>
80 </div>
81 <br class="table-break"><p>
82         In the table below, <code class="computeroutput">a</code> denotes a (possibly const) value of type
83         <code class="computeroutput">X</code>.
84       </p>
85 <div class="table">
86 <a name="boost_asio.reference.Protocol.t1"></a><p class="title"><b>Table&#160;24.&#160;Protocol requirements for extensible implementations</b></p>
87 <div class="table-contents"><table class="table" summary="Protocol requirements for extensible implementations">
88 <colgroup>
89 <col>
90 <col>
91 <col>
92 </colgroup>
93 <thead><tr>
94 <th>
95                 <p>
96                   expression
97                 </p>
98               </th>
99 <th>
100                 <p>
101                   return type
102                 </p>
103               </th>
104 <th>
105                 <p>
106                   assertion/note<br> pre/post-conditions
107                 </p>
108               </th>
109 </tr></thead>
110 <tbody>
111 <tr>
112 <td>
113                 <p>
114                   <code class="computeroutput">a.family()</code>
115                 </p>
116               </td>
117 <td>
118                 <p>
119                   <code class="computeroutput">int</code>
120                 </p>
121               </td>
122 <td>
123                 <p>
124                   Returns a value suitable for passing as the <span class="emphasis"><em>domain</em></span>
125                   argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/000095399/functions/socket.html" target="_top"><code class="computeroutput"><span class="identifier">socket</span><span class="special">()</span></code></a>
126                   (or equivalent).
127                 </p>
128               </td>
129 </tr>
130 <tr>
131 <td>
132                 <p>
133                   <code class="computeroutput">a.type()</code>
134                 </p>
135               </td>
136 <td>
137                 <p>
138                   <code class="computeroutput">int</code>
139                 </p>
140               </td>
141 <td>
142                 <p>
143                   Returns a value suitable for passing as the <span class="emphasis"><em>type</em></span>
144                   argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/000095399/functions/socket.html" target="_top"><code class="computeroutput"><span class="identifier">socket</span><span class="special">()</span></code></a>
145                   (or equivalent).
146                 </p>
147               </td>
148 </tr>
149 <tr>
150 <td>
151                 <p>
152                   <code class="computeroutput">a.protocol()</code>
153                 </p>
154               </td>
155 <td>
156                 <p>
157                   <code class="computeroutput">int</code>
158                 </p>
159               </td>
160 <td>
161                 <p>
162                   Returns a value suitable for passing as the <span class="emphasis"><em>protocol</em></span>
163                   argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/000095399/functions/socket.html" target="_top"><code class="computeroutput"><span class="identifier">socket</span><span class="special">()</span></code></a>
164                   (or equivalent).
165                 </p>
166               </td>
167 </tr>
168 </tbody>
169 </table></div>
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