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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>equal_to<T></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>equal_to<T></H1><Table CellPadding=0 CellSpacing=0 width=100%><TR><TD Align=left><Img src = "functors.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right><Img src = "type.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD></TR><TR><TD Align=left VAlign=top><b>Category</b>: functors</TD><TD Align=right VAlign=top><b>Component type</b>: type</TD></TR></Table><h3>Description</h3><tt>Equal_to<T></tt> is a <A href="functors.html">function object</A>. Specifically, it is an <A href="AdaptableBinaryPredicate.html">Adaptable Binary Predicate</A>, which means it is a function object that tests the truth or falsehood of some condition.If <tt>f</tt> is an object of class<tt>equal_to<T></tt> and <tt>x</tt> and <tt>y</tt> are objects of class <tt>T</tt>, then<tt>f(x,y)</tt> returns <tt>true</tt> if <tt>x == y</tt> and <tt>false</tt> otherwise.<h3>Example</h3>Rearrange a vector such that all of the elements that are equal tozero precede all nonzero elements.<pre><A href="Vector.html">vector</A><int> V;...<A href="partition.html">partition</A>(V.begin(), V.end(), <A href="binder2nd.html">bind2nd</A>(equal_to<int>(), 0));</pre><h3>Definition</h3>Defined in the standard header <A href="functional">functional</A>, and in the nonstandardbackward-compatibility header <A href="function.h">function.h</A>.<h3>Template parameters</h3><Table border><TR><TH>Parameter</TH><TH>Description</TH><TH>Default</TH></TR><TR><TD VAlign=top><tt>T</tt></TD><TD VAlign=top>The type of <tt>equal_to</tt>'s arguments.</TD><TD VAlign=top> </TD></tr></table><h3>Model of</h3><A href="AdaptableBinaryPredicate.html">Adaptable Binary Predicate</A>, <A href="DefaultConstructible.html">DefaultConstructible</A><h3>Type requirements</h3><tt>T</tt> is <A href="EqualityComparable.html">EqualityComparable</A>.<h3>Public base classes</h3><tt><A href="binary_function.html">binary_function</A><T, T, bool></tt>.<h3>Members</h3><Table border><TR><TH>Member</TH><TH>Where defined</TH><TH>Description</TH></TR><TR><TD VAlign=top><tt>first_argument_type</tt></TD><TD VAlign=top> <A href="AdaptableBinaryPredicate.html">Adaptable Binary Predicate</A></TD><TD VAlign=top>The type of the first argument: <tt>T</tt></TD></TR><TR><TD VAlign=top><tt>second_argument_type</tt></TD><TD VAlign=top> <A href="AdaptableBinaryPredicate.html">Adaptable Binary Predicate</A></TD><TD VAlign=top>The type of the second argument: <tt>T</tt></TD></TR><TR><TD VAlign=top><tt>result_type</tt></TD><TD VAlign=top> <A href="AdaptableBinaryPredicate.html">Adaptable Binary Predicate</A></TD><TD VAlign=top>The type of the result: <tt>bool</tt></TD></TR><TR><TD VAlign=top><tt>equal_to()</tt></TD><TD VAlign=top> <A href="DefaultConstructible.html">DefaultConstructible</A></TD><TD VAlign=top>The default constructor.</TD></TR><TR><TD VAlign=top><tt>bool operator()(const T& x, const T& y)</tt></TD><TD VAlign=top> <A href="BinaryFunction.html">Binary Function</A></TD><TD VAlign=top>Function call operator. The return value is <tt>x == y</tt>.</TD></tr></table><h3>New members</h3>All of <tt>equal_to</tt>'s members are defined in the <A href="AdaptableBinaryPredicate.html">Adaptable Binary Predicate</A> and <A href="DefaultConstructible.html">DefaultConstructible</A>requirements.<tt>Equal_to</tt> does not introduce any new members.<h3>Notes</h3><h3>See also</h3>The <A href="functors.html">function object overview</A>, <A href="AdaptableBinaryPredicate.html">Adaptable Binary Predicate</A>, <tt><A href="not_equal_to.html">not_equal_to</A></tt>,<tt><A href="greater.html">greater</A></tt>,<tt><A href="less.html">less</A></tt>,<tt><A href="greater_equal.html">greater_equal</A></tt>,<tt><A href="less_equal.html">less_equal</A></tt><!-- 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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