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| <h1>Copy Constructible</h1> |
| |
| <h3>Description</h3> |
| |
| <p>A type is Copy Constructible if it is possible to copy objects of that |
| type.</p> |
| |
| <h3>Notation</h3> |
| |
| <table summary=""> |
| <tr> |
| <td valign="top"><tt>T</tt></td> |
| |
| <td valign="top">is type that is a model of Copy Constructible</td> |
| </tr> |
| |
| <tr> |
| <td valign="top"><tt>t</tt></td> |
| |
| <td valign="top">is an object of type <tt>T</tt></td> |
| </tr> |
| |
| <tr> |
| <td valign="top"><tt>u</tt></td> |
| |
| <td valign="top">is an object of type <tt>const T</tt></td> |
| </tr> |
| </table> |
| |
| <h3>Definitions</h3> |
| |
| <h3>Valid expressions</h3> |
| |
| <table border summary=""> |
| <tr> |
| <th>Name</th> |
| |
| <th>Expression</th> |
| |
| <th>Return type</th> |
| |
| <th>Semantics</th> |
| </tr> |
| |
| <tr> |
| <td valign="top">Copy constructor</td> |
| |
| <td valign="top"><tt>T(t)</tt></td> |
| |
| <td valign="top"><tt>T</tt></td> |
| |
| <td valign="top"><tt>t</tt> is equivalent to <tt>T(t)</tt></td> |
| </tr> |
| |
| <tr> |
| <td valign="top">Copy constructor</td> |
| |
| <td valign="top"> |
| <pre> |
| T(u) |
| </pre> |
| </td> |
| |
| <td valign="top"><tt>T</tt></td> |
| |
| <td valign="top"><tt>u</tt> is equivalent to <tt>T(u)</tt></td> |
| </tr> |
| |
| <tr> |
| <td valign="top">Destructor</td> |
| |
| <td valign="top"> |
| <pre> |
| t.~T() |
| </pre> |
| </td> |
| |
| <td valign="top"><tt>T</tt></td> |
| |
| <td valign="top"> </td> |
| </tr> |
| |
| <tr> |
| <td valign="top">Address Operator</td> |
| |
| <td valign="top"> |
| <pre> |
| &t |
| </pre> |
| </td> |
| |
| <td valign="top"><tt>T*</tt></td> |
| |
| <td valign="top">denotes the address of <tt>t</tt></td> |
| </tr> |
| |
| <tr> |
| <td valign="top">Address Operator</td> |
| |
| <td valign="top"> |
| <pre> |
| &u |
| </pre> |
| </td> |
| |
| <td valign="top"><tt>T*</tt></td> |
| |
| <td valign="top">denotes the address of <tt>u</tt></td> |
| </tr> |
| </table> |
| |
| <h3>Models</h3> |
| |
| <ul> |
| <li><tt>int</tt></li> |
| |
| <li><tt>std::pair</tt></li> |
| </ul> |
| |
| <h3>Concept Checking Class</h3> |
| <pre> |
| template <class T> |
| struct CopyConstructibleConcept |
| { |
| void constraints() { |
| T a(b); // require copy constructor |
| T* ptr = &a; // require address of operator |
| const_constraints(a); |
| ignore_unused_variable_warning(ptr); |
| } |
| void const_constraints(const T& a) { |
| T c(a); // require const copy constructor |
| const T* ptr = &a; // require const address of operator |
| ignore_unused_variable_warning(c); |
| ignore_unused_variable_warning(ptr); |
| } |
| T b; |
| }; |
| </pre> |
| |
| <h3>See also</h3> |
| |
| <p><a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default |
| Constructible</a> and <a href="./Assignable.html">Assignable</a><br></p> |
| <hr> |
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| |
| <p>Revised |
| <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05 |
| December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p> |
| |
| <table summary=""> |
| <tr valign="top"> |
| <td nowrap><i>Copyright © 2000</i></td> |
| |
| <td><i><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>)</i></td> |
| </tr> |
| </table> |
| |
| <p><i>Distributed under the Boost Software License, Version 1.0. (See |
| accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or |
| copy at <a href= |
| "http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p> |
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