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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>Adaptable Binary Function</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>Adaptable Binary Function</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 = "concept.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>: concept</TD></TR></Table><h3>Description</h3>An Adaptable Binary Function is a <A href="BinaryFunction.html">Binary Function</A> withnested <tt>typedef</tt>s that define its argument types and result type. <A href="#1">[1]</A> <A href="#2">[2]</A>These nested <tt>typedef</tt>s make it possible to use function object adaptors.<h3>Refinement of</h3><A href="BinaryFunction.html">Binary Function</A><h3>Associated types</h3><Table border><TR><TD VAlign=top>First argument type</TD><TD VAlign=top><tt>F::first_argument_type</tt></TD><TD VAlign=top>The type of <tt>F</tt>'s first argument</TD></TR><TR><TD VAlign=top>Second argument type</TD><TD VAlign=top><tt>F::second_argument_type</tt></TD><TD VAlign=top>The type of <tt>F</tt>'s second argument</TD></TR><TR><TD VAlign=top>Result type</TD><TD VAlign=top><tt>F::result_type</tt></TD><TD VAlign=top>The type returned when the Binary Function is called</TD></tr></table><h3>Notation</h3><Table><TR><TD VAlign=top><tt>F</tt></TD><TD VAlign=top>A type that is a model of Binary Function</TD></tr></table><h3>Definitions</h3><h3>Valid expressions</h3>None, except for those defined by <A href="BinaryFunction.html">Binary Function</A><h3>Expression semantics</h3><h3>Complexity guarantees</h3><h3>Invariants</h3><h3>Models</h3><UL><LI><tt><A href="plus.html">plus</A></tt><LI><tt><A href="project1st.html">project1st</A></tt><LI><tt><A href="pointer_to_binary_function.html">pointer_to_binary_function</A></tt></UL><h3>Notes</h3><P><A name="1">[1]</A>Note the implication of this: a function pointer <tt>T (*f)(X,Y)</tt> isa <A href="BinaryFunction.html">Binary Function</A>, but not an Adaptable Binary Function: theexpressions <tt>f::first_argument_type</tt>, <tt>f::second_argument_type</tt>, and<tt>f::result_type</tt> are nonsensical.<P><A name="2">[2]</A>When you define a class that is a model of Adaptable Binary Function,you must provide these <tt>typedef</tt>s. The easiest way to do this is toderive the class from the base class <tt><A href="binary_function.html">binary_function</A></tt>. This is an empty class, with no member functions or member variables; the onlyreason it exists is to make defining Adaptable Binary Functionsmore convenient. <tt><A href="binary_function.html">Binary_function</A></tt> is very similar to the base classes used by the <A href="iterator_tags.html">iterator tag</A> functions.<h3>See also</h3><A href="BinaryFunction.html">Binary Function</A>, <A href="AdaptableGenerator.html">Adaptable Generator</A>, <A href="AdaptableUnaryFunction.html">Adaptable Unary Function</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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