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107 lines
2.7 KiB
HTML
107 lines
2.7 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>LvaluePropertyAccessor</Title>
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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="../../c++boost.gif"
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ALT="C++ Boost">
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<BR Clear>
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<H2><A NAME="concept:LvaluePropertyAccessor"></A>
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LvaluePropertyAccessor
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</H2>
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The LvaluePropertyAccessor provides an interface for accessing a
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reference to a property object (instead of a copy of the object as in
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the <TT>get()</TT> function required by <a
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href="./ReadablePropertyAccessor.html">ReadablePropertyAccessor</a>). An
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LvaluePropertyAccessor can be <I>mutable</I> or
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<I>non-mutable</I>. The mutable LvaluePropertyAccessor returns a
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reference whereas the non-mutable returns a const reference.
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<H3>Refinement of</H3>
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<a href="./ReadablePropertyAccessor.html">ReadablePropertyAccessor</a>
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for non-mutable or <a href="./ReadWritePropertyAccessor.html">ReadWritePropertyAccessor</a> for mutable property accessor.
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<h3>Notation</h3>
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<Table>
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<TR>
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<TD><tt>PA</tt></TD>
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<TD>A type that is a model of LvaluePropertyAccessor.</TD>
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</TR>
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<TR>
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<TD><tt>pa</tt></TD>
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<TD>An object of type <tt>PA</tt>.</td>
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</TR>
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<TR>
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<TD><tt>key</tt></TD>
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<TD>An object of type <tt>boost::property_traits<PA>::key_type</tt>.</td>
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</TR>
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</table>
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<h3>Associated Types</h3>
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<table border>
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<tr>
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<td>Property Accessor Category
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<td><TT>boost::property_traits<PA>::category</TT></td>
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<td>
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The category of the property: a type convertible to
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<TT>boost::lvalue_property_accessor_tag</TT>.
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</td>
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</tr>
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</table>
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<h3>Valid Expressions</h3>
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<table border>
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<tr>
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<th>Name</th><th>Expression</th><th>Return Type</th><th>Description</th>
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</tr>
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<tr>
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<td>Access Property Value </td>
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<TD><TT>pa[key]</TT></TD>
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<TD>
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<TT>value_type&</TT> for mutable, <TT>const value_type&</TT>
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otherwise.
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</TD>
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<TD>Obtain a reference to the property identified by <TT>key</TT>.</TD>
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</TR>
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</TABLE>
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<h3>See Also</h3>
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<a href="./property_accessor.html">Property accessor concepts</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.boost.org/people/jeremy_siek.htm>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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