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<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>Simple Associative Container</Title><!-- Generated by htmldoc --></HEAD><BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" ALINK="#ff0000"> <IMG SRC="CorpID.gif" ALT="SGI" HEIGHT="43" WIDTH="151"> <!--end header--><BR Clear><H1>Simple 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 Simple Associative Container is an <A href="AssociativeContainer.html">Associative Container</A> whereelements are their own keys. A key in a Simple Associative Containeris not associated with any additional value.<h3>Refinement of</h3><A href="AssociativeContainer.html">Associative Container</A><h3>Associated types</h3>None, except for those described in the <A href="AssociativeContainer.html">Associative Container</A>requirements. Simple Associative Container, however, introduces twonew type restrictions.<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>. The types <tt>key_type</tt> and <tt>value_type</tt> must be the same type.</TD></TR><TR><TD VAlign=top>Iterator</TD><TD VAlign=top><tt>X::iterator</tt></TD><TD VAlign=top>The type of iterator used to iterate through a Simple Associative Container's elements. The types <tt>X::iterator</tt> and <tt>X::const_iterator</tt> must be the same type. That is, a Simple Associative Container does not provide mutable iterators. <A href="#1">[1]</A></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 Simple 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>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><Table border><TR><TD VAlign=top>Immutability of Elements</TD><TD VAlign=top>Every element of a Simple Associative Container is immutable. Objects may be inserted and erased, but not modified. <A href="#1">[1]</A></TD></tr></table><h3>Models</h3><UL><LI><tt><A href="set.html">set</A></tt><LI><tt><A href="multiset.html">multiset</A></tt><LI><tt><A href="hash_set.html">hash_set</A></tt><LI><tt><A href="hash_multiset.html">hash_multiset</A></tt></UL><h3>Notes</h3><P><A name="1">[1]</A>This is a consequence of the Immutability of Keys invariant of<A href="AssociativeContainer.html">Associative Container</A>. Keys may never be modified; values ina Simple Associative Container are themselves keys, so it immediatelyfollows that values in a Simple Associative Container may not be modified.<h3>See also</h3><A href="AssociativeContainer.html">Associative Container</A>, <A href="PairAssociativeContainer.html">Pair Associative Container</A><!--start footer--> <HR SIZE="6"><A href="http://www.sgi.com/"><IMG SRC="surf.gif" HEIGHT="54" WIDTH="54" ALT="[Silicon Surf]"></A><A HREF="index.html"><IMG SRC="stl_home.gif" HEIGHT="54" WIDTH="54" ALT="[STL Home]"></A><BR><FONT SIZE="-2"><A href="http://www.sgi.com/Misc/sgi_info.html" TARGET="_top">Copyright © 1999 Silicon Graphics, Inc.</A> All Rights Reserved.</FONT><FONT SIZE="-3"><a href="http://www.sgi.com/Misc/external.list.html" TARGET="_top">TrademarkInformation</A></FONT><P></BODY></HTML> ⌨️ 快捷键说明
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