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13<Head>
14<Title>Copy Constructible</Title>
15</HEAD>
16<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" 
17        ALINK="#ff0000"> 
18<IMG SRC="../../boost.png" 
19     ALT="C++ Boost" width="277" height="86"> 
20<!--end header-->
21<BR Clear>
22<H1>Copy Constructible</H1>
23
24<h3>Description</h3>
25A type is Copy Constructible if it is possible to copy objects of that
26type.
27
28<h3>Notation</h3>
29<Table>
30<TR>
31<TD VAlign=top>
32<tt>T</tt>
33</TD>
34<TD VAlign=top>
35is type that is a model of Copy Constructible
36</TD>
37</TR>
38
39<TR>
40<TD VAlign=top>
41<tt>t</tt>
42</TD>
43<TD VAlign=top>
44is an object of type <tt>T</tt>
45</TD>
46</tr>
47
48<TR>
49<TD VAlign=top>
50<tt>u</tt>
51</TD>
52<TD VAlign=top>
53is an object of type <tt>const T</tt>
54</TD>
55</tr>
56
57</table>
58<h3>Definitions</h3>
59<h3>Valid expressions</h3>
60<Table border>
61<TR>
62<TH>
63Name
64</TH>
65<TH>
66Expression
67</TH>
68<TH>
69Return type
70</TH>
71<TH>
72Semantics
73</TH>
74</TR>
75<TR>
76<TD VAlign=top>
77Copy constructor
78</TD>
79<TD VAlign=top>
80<tt>T(t)</tt>
81</TD>
82<TD VAlign=top>
83<tt>T</tt>
84</TD>
85<TD VAlign=top>
86<tt>t</tt> is equivalent to <tt>T(t)</tt>
87</TD>
88</TR>
89
90
91<TR>
92<TD VAlign=top>
93Copy constructor
94</TD>
95<TD VAlign=top>
96<pre>
97T(u)
98</pre>
99</TD>
100<TD VAlign=top>
101<tt>T</tt>
102</TD>
103<TD VAlign=top>
104<tt>u</tt> is equivalent to <tt>T(u)</tt>
105</TD>
106</TR>
107
108
109<TR>
110<TD VAlign=top>
111Destructor
112</TD>
113<TD VAlign=top>
114<pre>
115t.~T()
116</pre>
117</TD>
118<TD VAlign=top>
119<tt>T</tt>
120</TD>
121<TD VAlign=top>
122&nbsp;
123</TD>
124</TR>
125
126<TR>
127<TD VAlign=top>
128Address Operator
129</TD>
130<TD VAlign=top>
131<pre>
132&amp;t
133</pre>
134</TD>
135<TD VAlign=top>
136<tt>T*</tt>
137</TD>
138<TD VAlign=top>
139denotes the address of <tt>t</tt>
140</TD>
141</TR>
142
143<TR>
144<TD VAlign=top>
145Address Operator
146</TD>
147<TD VAlign=top>
148<pre>
149&amp;u
150</pre>
151</TD>
152<TD VAlign=top>
153<tt>T*</tt>
154</TD>
155<TD VAlign=top>
156denotes the address of <tt>u</tt>
157</TD>
158</TR>
159
160
161
162</table>
163
164
165</table>
166<h3>Models</h3>
167
168<UL>
169<LI><tt>int</tt>
170<LI><tt>std::pair</tt>
171</UL>
172
173<h3>Concept Checking Class</h3>
174
175<pre>
176  template &lt;class T&gt;
177  struct CopyConstructibleConcept
178  {
179    void constraints() {
180      T a(b);            // require copy constructor
181      T* ptr = &amp;a;       // require address of operator
182      const_constraints(a);
183      ignore_unused_variable_warning(ptr);
184    }
185    void const_constraints(const T&amp; a) {
186      T c(a);            // require const copy constructor
187      const T* ptr = &amp;a; // require const address of operator
188      ignore_unused_variable_warning(c);
189      ignore_unused_variable_warning(ptr);
190    }
191    T b;
192  };
193</pre>
194
195<h3>See also</h3>
196<A
197href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</A>
198and
199<A hrefa="./Assignable.html">Assignable</A>
200
201<br>
202<HR>
203<TABLE>
204<TR valign=top>
205<TD nowrap>Copyright &copy 2000</TD><TD>
206<A HREF=http://www.lsc.nd.edu/~jsiek>Jeremy Siek</A>, Univ.of Notre Dame (<A HREF="mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</A>)
207</TD></TR></TABLE>
208
209</BODY>
210</HTML> 
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