📄 pairassociativecontainer.html
字号:
<HTML><!-- -- Copyright (c) 1996-1999 -- Silicon Graphics Computer Systems, Inc. -- -- Permission to use, copy, modify, distribute and sell this software -- and its documentation for any purpose is hereby granted without fee, -- provided that the above copyright notice appears in all copies and -- that both that copyright notice and this permission notice appear -- in supporting documentation. Silicon Graphics makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- -- Copyright (c) 1994 -- Hewlett-Packard Company -- -- Permission to use, copy, modify, distribute and sell this software -- and its documentation for any purpose is hereby granted without fee, -- provided that the above copyright notice appears in all copies and -- that both that copyright notice and this permission notice appear -- in supporting documentation. Hewlett-Packard Company makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- --><Head><Title>Pair Associative Container</Title><!-- Generated by htmldoc --></HEAD><BODY TEXT="#000000" LINK="#006600" ALINK="#003300" VLINK="#7C7F87" BGCOLOR="#FFFFFF"><A HREF="/"><IMG SRC="/images/common/sgilogo_small.gif" ALT="SGI Logo" WIDTH="80" HEIGHT="72" BORDER="0"></A><P><!--end header--><BR Clear><H1>Pair Associative Container</H1><Table CellPadding=0 CellSpacing=0 width=100%><TR><TD Align=left><Img src = "containers.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right><Img src = "concept.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD></TR><TR><TD Align=left VAlign=top><b>Category</b>: containers</TD><TD Align=right VAlign=top><b>Component type</b>: concept</TD></TR></Table><h3>Description</h3>A Pair Associative Container is an <A href="AssociativeContainer.html">Associative Container</A> thatassociates a key with some other object. The value type of aPair Associative Container is <tt><A href="pair.html">pair</A><const key_type, data_type></tt>. <A href="#1">[1]</A><h3>Refinement of</h3><A href="AssociativeContainer.html">Associative Container</A><h3>Associated types</h3>One new type is introduced, in addition to the types defined in the<A href="AssociativeContainer.html">Associative Container</A> requirements. Additionally, Pair AssociativeContainer introduces one new type restriction<Table border><TR><TD VAlign=top>Key type</TD><TD VAlign=top><tt>X::key_type</tt></TD><TD VAlign=top>The type of the key associated with <tt>X::value_type</tt>.</TD></TR><TR><TD VAlign=top>Data type</TD><TD VAlign=top><tt>X::data_type</tt></TD><TD VAlign=top>The type of the data associated with <tt>X::value_type</tt>. A Pair Associative Container can be thought of as a mapping from <tt>key_type</tt> to <tt>data_type</tt>.</TD></TR><TR><TD VAlign=top>Value type</TD><TD VAlign=top><tt>X::value_type</tt></TD><TD VAlign=top>The type of object stored in the container. The value type is required to be <tt><A href="pair.html">pair</A><const key_type, data_type></tt>.</TD></tr></table><h3>Notation</h3><Table><TR><TD VAlign=top><tt>X</tt></TD><TD VAlign=top>A type that is a model of Pair Associative Container</TD></TR><TR><TD VAlign=top><tt>a</tt></TD><TD VAlign=top>Object of type <tt>X</tt></TD></TR><TR><TD VAlign=top><tt>t</tt></TD><TD VAlign=top>Object of type <tt>X::value_type</tt></TD></TR><TR><TD VAlign=top><tt>d</tt></TD><TD VAlign=top>Object of type <tt>X::data_type</tt></TD></TR><TR><TD VAlign=top><tt>k</tt></TD><TD VAlign=top>Object of type <tt>X::key_type</tt></TD></TR><TR><TD VAlign=top><tt>p</tt>, <tt>q</tt></TD><TD VAlign=top>Object of type <tt>X::iterator</tt></TD></tr></table><h3>Definitions</h3><h3>Valid expressions</h3>None, except for those defined in the <A href="AssociativeContainer.html">Associative Container</A> requirements.<h3>Expression semantics</h3><h3>Complexity guarantees</h3><h3>Invariants</h3><h3>Models</h3><UL><LI><tt><A href="Map.html">map</A></tt><LI><tt><A href="Multimap.html">multimap</A></tt><LI><tt><A href="hash_map.html">hash_map</A></tt><LI><tt><A href="hash_multimap.html">hash_multimap</A></tt></UL><h3>Notes</h3><P><A name="1">[1]</A>The value type must be <tt><A href="pair.html">pair</A><const key_type, data_type></tt>,rather than <tt><A href="pair.html">pair</A><key_type, data_type></tt>, because of the<A href="AssociativeContainer.html">Associative Container</A> invariant of key immutability. The<tt>data_type</tt> part of an object in a Pair Associative Container may be modified, but the <tt>key_type</tt> part may not be. Note the implicationof this fact: a Pair Associative Container cannot providemutable iterators (as defined in the <A href="trivial.html">Trivial Iterator</A>requirements), because the value type of a mutable iterator mustbe <A href="Assignable.html">Assignable</A>, and <tt><A href="pair.html">pair</A><const key_type, data_type></tt> is not <A href="Assignable.html">Assignable</A>. However, a Pair Associative Container canprovide iterators that are not completely constant: iterators suchthat the expression <tt>(*i).second = d</tt> is valid.<h3>See also</h3><A href="AssociativeContainer.html">Associative Container</A>, <A href="SimpleAssociativeContainer.html">Simple Associative Container</A><!-- start footer --><!-- Footer Begins --><STYLE TYPE="text/css"><!--TD.footer, TD.footer A{ font-family: Arial, helvetica, sans-serif; font-size: 8pt;}A.home {font-family: Arial, helvetica, sans-serif;}--></STYLE><P><A CLASS="home" HREF="index.html">STL Home</A><P><TABLE WIDTH="600" CELLPADDING="0" CELLPADDING="0" BORDER="0"> <TR> <TD ALIGN="RIGHT" CLASS="footer"><A HREF="/company_info/terms.html" TARGET="_top">terms of use</A> | <A HREF="/company_info/privacy.html" TARGET="_top">privacy policy</A></TD> <TD ALIGN="CENTER" CLASS="footer"> | </TD> <TD ALIGN="LEFT" CLASS="footer"><A HREF="/cgi-bin/feedback/" TARGET="_top">contact us</A></TD> </TR><TR> <TD ALIGN="RIGHT" CLASS="footer">Copyright © 1993-2003 Silicon Graphics, Inc. All rights reserved.</TD> <TD ALIGN="CENTER" CLASS="footer"> | </TD> <TD ALIGN="LEFT" CLASS="footer"><A HREF="/company_info/trademarks/" TARGET="_top">Trademark Information</A></TD> </TR></TABLE><!-- Footer Ends --><!-- end footer --><P></BODY></HTML> ⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -