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8 <title>Copy Constructible</title>
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13 <img src="../../boost.png" alt="C++ Boost" width="277" height=
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15
16 <h1>Copy Constructible</h1>
17
18 <h3>Description</h3>
19
20 <p>A type is Copy Constructible if it is possible to copy objects of that
21 type.</p>
22
23 <h3>Notation</h3>
24
25 <table summary="">
26 <tr>
27 <td valign="top"><tt>T</tt></td>
28
29 <td valign="top">is type that is a model of Copy Constructible</td>
30 </tr>
31
32 <tr>
33 <td valign="top"><tt>t</tt></td>
34
35 <td valign="top">is an object of type <tt>T</tt></td>
36 </tr>
37
38 <tr>
39 <td valign="top"><tt>u</tt></td>
40
41 <td valign="top">is an object of type <tt>const T</tt></td>
42 </tr>
43 </table>
44
45 <h3>Definitions</h3>
46
47 <h3>Valid expressions</h3>
48
49 <table border summary="">
50 <tr>
51 <th>Name</th>
52
53 <th>Expression</th>
54
55 <th>Return type</th>
56
57 <th>Semantics</th>
58 </tr>
59
60 <tr>
61 <td valign="top">Copy constructor</td>
62
63 <td valign="top"><tt>T(t)</tt></td>
64
65 <td valign="top"><tt>T</tt></td>
66
67 <td valign="top"><tt>t</tt> is equivalent to <tt>T(t)</tt></td>
68 </tr>
69
70 <tr>
71 <td valign="top">Copy constructor</td>
72
73 <td valign="top">
74 <pre>
75T(u)
76</pre>
77 </td>
78
79 <td valign="top"><tt>T</tt></td>
80
81 <td valign="top"><tt>u</tt> is equivalent to <tt>T(u)</tt></td>
82 </tr>
83
84 <tr>
85 <td valign="top">Destructor</td>
86
87 <td valign="top">
88 <pre>
89t.~T()
90</pre>
91 </td>
92
93 <td valign="top"><tt>T</tt></td>
94
95 <td valign="top">&nbsp;</td>
96 </tr>
97
98 <tr>
99 <td valign="top">Address Operator</td>
100
101 <td valign="top">
102 <pre>
103&amp;t
104</pre>
105 </td>
106
107 <td valign="top"><tt>T*</tt></td>
108
109 <td valign="top">denotes the address of <tt>t</tt></td>
110 </tr>
111
112 <tr>
113 <td valign="top">Address Operator</td>
114
115 <td valign="top">
116 <pre>
117&amp;u
118</pre>
119 </td>
120
121 <td valign="top"><tt>T*</tt></td>
122
123 <td valign="top">denotes the address of <tt>u</tt></td>
124 </tr>
125 </table>
126
127 <h3>Models</h3>
128
129 <ul>
130 <li><tt>int</tt></li>
131
132 <li><tt>std::pair</tt></li>
133 </ul>
134
135 <h3>Concept Checking Class</h3>
136 <pre>
137 template &lt;class T&gt;
138 struct CopyConstructibleConcept
139 {
140 void constraints() {
141 T a(b); // require copy constructor
142 T* ptr = &amp;a; // require address of operator
143 const_constraints(a);
144 ignore_unused_variable_warning(ptr);
145 }
146 void const_constraints(const T&amp; a) {
147 T c(a); // require const copy constructor
148 const T* ptr = &amp;a; // require const address of operator
149 ignore_unused_variable_warning(c);
150 ignore_unused_variable_warning(ptr);
151 }
152 T b;
153 };
154</pre>
155
156 <h3>See also</h3>
157
158 <p><a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default
159 Constructible</a> and <a href="./Assignable.html">Assignable</a><br></p>
160 <hr>
161
162 <p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
163 "../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
164 height="31" width="88"></a></p>
165
166 <p>Revised
167 <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05
168 December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
169
170 <table summary="">
171 <tr valign="top">
172 <td nowrap><i>Copyright &copy; 2000</i></td>
173
174 <td><i><a href="http://www.lsc.nd.edu/~jsiek">Jeremy Siek</a>, Univ.of
175 Notre Dame (<a href=
176 "mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</a>)</i></td>
177 </tr>
178 </table>
179
180 <p><i>Distributed under the Boost Software License, Version 1.0. (See
181 accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
182 copy at <a href=
183 "http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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