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211 lines
3.3 KiB
HTML
211 lines
3.3 KiB
HTML
<HTML>
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<!--
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-- Copyright (c) Jeremy Siek 2000
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--
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-- Permission to use, copy, modify, distribute and sell this software
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-- and its documentation for any purpose is hereby granted without fee,
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-- provided that the above copyright notice appears in all copies and
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-- that both that copyright notice and this permission notice appear
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-- in supporting documentation. Silicon Graphics makes no
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-- representations about the suitability of this software for any
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-- purpose. It is provided "as is" without express or implied warranty.
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-->
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<Head>
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<Title>Copy Constructible</Title>
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</HEAD>
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<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
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ALINK="#ff0000">
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<IMG SRC="../../boost.png"
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ALT="C++ Boost" width="277" height="86">
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<!--end header-->
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<BR Clear>
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<H1>Copy Constructible</H1>
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<h3>Description</h3>
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A type is Copy Constructible if it is possible to copy objects of that
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type.
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<h3>Notation</h3>
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<Table>
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<TR>
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<TD VAlign=top>
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<tt>T</tt>
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</TD>
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<TD VAlign=top>
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is type that is a model of Copy Constructible
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</TD>
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</TR>
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<TR>
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<TD VAlign=top>
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<tt>t</tt>
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</TD>
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<TD VAlign=top>
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is an object of type <tt>T</tt>
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</TD>
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</tr>
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<TR>
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<TD VAlign=top>
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<tt>u</tt>
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</TD>
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<TD VAlign=top>
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is an object of type <tt>const T</tt>
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</TD>
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</tr>
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</table>
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<h3>Definitions</h3>
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<h3>Valid expressions</h3>
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<Table border>
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<TR>
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<TH>
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Name
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</TH>
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<TH>
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Expression
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</TH>
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<TH>
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Return type
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</TH>
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<TH>
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Semantics
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</TH>
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</TR>
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<TR>
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<TD VAlign=top>
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Copy constructor
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</TD>
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<TD VAlign=top>
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<tt>T(t)</tt>
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</TD>
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<TD VAlign=top>
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<tt>T</tt>
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</TD>
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<TD VAlign=top>
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<tt>t</tt> is equivalent to <tt>T(t)</tt>
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</TD>
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</TR>
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<TR>
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<TD VAlign=top>
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Copy constructor
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</TD>
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<TD VAlign=top>
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<pre>
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T(u)
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</pre>
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</TD>
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<TD VAlign=top>
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<tt>T</tt>
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</TD>
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<TD VAlign=top>
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<tt>u</tt> is equivalent to <tt>T(u)</tt>
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</TD>
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</TR>
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<TR>
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<TD VAlign=top>
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Destructor
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</TD>
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<TD VAlign=top>
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<pre>
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t.~T()
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</pre>
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</TD>
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<TD VAlign=top>
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<tt>T</tt>
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</TD>
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<TD VAlign=top>
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</TD>
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</TR>
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<TR>
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<TD VAlign=top>
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Address Operator
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</TD>
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<TD VAlign=top>
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<pre>
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&t
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</pre>
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</TD>
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<TD VAlign=top>
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<tt>T*</tt>
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</TD>
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<TD VAlign=top>
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denotes the address of <tt>t</tt>
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</TD>
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</TR>
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<TR>
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<TD VAlign=top>
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Address Operator
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</TD>
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<TD VAlign=top>
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<pre>
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&u
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</pre>
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</TD>
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<TD VAlign=top>
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<tt>T*</tt>
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</TD>
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<TD VAlign=top>
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denotes the address of <tt>u</tt>
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</TD>
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</TR>
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</table>
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</table>
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<h3>Models</h3>
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<UL>
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<LI><tt>int</tt>
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<LI><tt>std::pair</tt>
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</UL>
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<h3>Concept Checking Class</h3>
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<pre>
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template <class T>
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struct CopyConstructibleConcept
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{
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void constraints() {
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T a(b); // require copy constructor
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T* ptr = &a; // require address of operator
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const_constraints(a);
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ignore_unused_variable_warning(ptr);
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}
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void const_constraints(const T& a) {
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T c(a); // require const copy constructor
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const T* ptr = &a; // require const address of operator
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ignore_unused_variable_warning(c);
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ignore_unused_variable_warning(ptr);
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}
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T b;
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};
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</pre>
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<h3>See also</h3>
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<A
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href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</A>
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and
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<A hrefa="./Assignable.html">Assignable</A>
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<br>
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<HR>
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<TABLE>
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<TR valign=top>
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<TD nowrap>Copyright © 2000</TD><TD>
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<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>)
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</TD></TR></TABLE>
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</BODY>
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</HTML>
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