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It is provided "as is" without express or implied warranty. -- --><Head><Title>binary_function<Arg1, Arg2, Result></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>binary_function<Arg1, Arg2, Result></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>Binary_function</tt> is an empty base class: it contains no memberfunctions or member variables, but only type information. Theonly reason it exists is to make it more convenient to definetypes that are models of the concept <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>.Specifically, any model of <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A> must definenested <tt>typedef</tt>s. Those <tt>typedef</tt>s are provided by the baseclass <tt>binary_function</tt>.<h3>Example</h3><pre>struct exponentiate : public binary_function<double, double, double> { double operator()(double x, double y) { return pow(x, y); }};</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>Arg1</tt></TD><TD VAlign=top>The function object's first argument type</TD><TD VAlign=top> </TD></TR><TR><TD VAlign=top><tt>Arg2</tt></TD><TD VAlign=top>The function object's second argument type</TD><TD VAlign=top> </TD></TR><TR><TD VAlign=top><tt>Result</tt></TD><TD VAlign=top>The function object's result type</TD><TD VAlign=top> </TD></tr></table><h3>Model of</h3><A href="Assignable.html">Assignable</A>, <A href="DefaultConstructible.html">Default Constructible</A><h3>Type requirements</h3><h3>Public base classes</h3>None.<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><tt>unary_function</tt></TD><TD VAlign=top>See below.</TD></TR><TR><TD VAlign=top><tt>second_argument_type</tt></TD><TD VAlign=top><tt>unary_function</tt></TD><TD VAlign=top>See below.</TD></TR><TR><TD VAlign=top><tt>result_type</tt></TD><TD VAlign=top><tt>unary_function</tt></TD><TD VAlign=top>See below.</TD></tr></table><h3>New members</h3>These members are not defined in the <A href="Assignable.html">Assignable</A> and <A href="DefaultConstructible.html">Default Constructible</A>requirements, but are specific to <tt>unary_function</tt>.<Table border><TR><TH>Member</TH><TH>Description</TH></TR><TR><TD VAlign=top><tt>first_argument_type</tt></TD><TD VAlign=top>The function object's first argument type. This is a <tt>typedef</tt> for the template parameter <tt>Arg1</tt>.</TD></TR><TR><TD VAlign=top><tt>second_argument_type</tt></TD><TD VAlign=top>The function object's second argument type. This is a <tt>typedef</tt> for the template parameter <tt>Arg2</tt>.</TD></TR><TR><TD VAlign=top><tt>result_type</tt></TD><TD VAlign=top>The function object's result type. This is a <tt>typedef</tt> for the template parameter <tt>Result</tt>.</TD></tr></table><h3>Notes</h3><h3>See also</h3>The <A href="functors.html">Function Object</A> overview, <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>,<tt><A href="unary_function.html">unary_function</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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