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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. 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It is provided "as is" without express or implied warranty. -- --><Head><Title>Multiple 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>Multiple 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 Multiple Associative Container is an <A href="AssociativeContainer.html">Associative Container</A> inwhich there may be more than one element with the same key. That is,it is an <A href="AssociativeContainer.html">Associative Container</A> that does not have the restrictionsof a <A href="UniqueAssociativeContainer.html">Unique Associative Container</A>.<h3>Refinement of</h3><A href="AssociativeContainer.html">Associative Container</A><h3>Associated types</h3>None, except for those defined by<A href="AssociativeContainer.html">Associative Container</A><h3>Notation</h3><Table><TR><TD VAlign=top><tt>X</tt></TD><TD VAlign=top>A type that is a model of Multiple 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>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>In addition to the expressions defined in<A href="AssociativeContainer.html">Associative Container</A>, thefollowing expressions must be valid.<Table border><TR><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH><TH>Return type</TH></TR><TR><TD VAlign=top>Range constructor</TD><TD VAlign=top><pre>X(i, j)X a(i, j);</pre></TD><TD VAlign=top><tt>i</tt> and <tt>j</tt> are <A href="InputIterator.html">Input Iterators</A> whose value type is convertible to <tt>T</tt> <A href="#1">[1]</A></TD><TD VAlign=top> </TD></TR><TR><TD VAlign=top>Insert element</TD><TD VAlign=top><tt>a.insert(t)</tt></TD><TD VAlign=top> </TD><TD VAlign=top><tt>X::iterator</tt></TD></TR><TR><TD VAlign=top>Insert range</TD><TD VAlign=top><tt>a.insert(i, j)</tt></TD><TD VAlign=top><tt>i</tt> and <tt>j</tt> are <A href="InputIterator.html">Input Iterators</A> whose value type is convertible to <tt>X::value_type</tt>.</TD><TD VAlign=top><tt>void</tt></TD></tr></table><h3>Expression semantics</h3><Table border><TR><TH>Name</TH><TH>Expression</TH><TH>Precondition</TH><TH>Semantics</TH><TH>Postcondition</TH></TR><TR><TD VAlign=top>Range constructor</TD><TD VAlign=top><pre>X(i, j)X a(i, j);</pre></TD><TD VAlign=top><tt>[i,j)</tt> is a valid range.</TD><TD VAlign=top>Creates an associative container that contains all elements in the range <tt>[i,j)</tt>.</TD><TD VAlign=top><tt>size()</tt> is equal to the distance from <tt>i</tt> to <tt>j</tt>. Each element in <tt>[i, j)</tt> is present in the container.</TD></TR><TR><TD VAlign=top>Insert element</TD><TD VAlign=top><tt>a.insert(t)</tt></TD><TD VAlign=top> </TD><TD VAlign=top>Inserts <tt>t</tt> into <tt>a</tt>.</TD><TD VAlign=top>The size of <tt>a</tt> is incremented by <tt>1</tt>. The value of <tt>a.count(t)</tt> is incremented by <tt>a</tt>.</TD></TR><TR><TD VAlign=top>Insert range</TD><TD VAlign=top><tt>a.insert(i, j)</tt></TD><TD VAlign=top><tt>[i, j)</tt> is a valid range.</TD><TD VAlign=top>Equivalent to <tt>a.insert(t)</tt> for each object <tt>t</tt> that is pointed to by an iterator in the range <tt>[i, j)</tt>. Each element is inserted into <tt>a</tt>.</TD><TD VAlign=top>The size of <tt>a</tt> is incremented by <tt>j - i</tt>.</TD></tr></table><h3>Complexity guarantees</h3>Average complexity for insert element is at most logarithmic. <P>Average complexity for insert range is at most <tt>O(N * log(size() + N))</tt>,where <tt>N</tt> is <tt>j - i</tt>.<h3>Invariants</h3><h3>Models</h3><UL><LI><tt><A href="multiset.html">multiset</A></tt><LI><tt><A href="Multimap.html">multimap</A></tt><LI><tt><A href="hash_multiset.html">hash_multiset</A></tt><LI><tt><A href="hash_multimap.html">hash_multimap</A></tt></UL><h3>Notes</h3><P><A name="1">[1]</A>At present (early 1998), not all compilers support"member templates". If your compiler supports membertemplates then <tt>i</tt> and <tt>j</tt> may be of any type thatconforms to the <A href="InputIterator.html">Input Iterator</A>requirements. If your compiler does not yet support membertemplates, however, then <tt>i</tt> and <tt>j</tt> must be of type<tt>const T*</tt> or of type <tt>X::const_iterator</tt>.<h3>See also</h3><A href="AssociativeContainer.html">Associative Container</A>, <A href="UniqueAssociativeContainer.html">Unique Associative Container</A>,<A href="UniqueSortedAssociativeContainer.html">Unique Sorted Associative Container</A>, <A href="MultipleSortedAssociativeContainer.html">Multiple Sorted 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. 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