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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>Adaptable Unary Function</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>Adaptable Unary 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 Unary Function is a <A href="UnaryFunction.html">Unary Function</A> with nested <tt>typedef</tt>s that define its argument type and result type. <A href="#1">[1]</A> <A href="#2">[2]</A>These nested <tt>typedef</tt> make it possible to use function object adaptors.<h3>Refinement of</h3><A href="UnaryFunction.html">Unary Function</A><h3>Associated types</h3><Table border><TR><TD VAlign=top>Argument type</TD><TD VAlign=top><tt>F::argument_type</tt></TD><TD VAlign=top>The type of <tt>F</tt>'s 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 Unary 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 Unary Function</TD></tr></table><h3>Definitions</h3><h3>Valid expressions</h3>None, except for those defined by <A href="UnaryFunction.html">Unary Function</A><h3>Expression semantics</h3><h3>Complexity guarantees</h3><h3>Invariants</h3><h3>Models</h3><UL><LI><tt><A href="negate.html">negate</A></tt><LI><tt><A href="identity.html">identity</A></tt><LI><tt><A href="pointer_to_unary_function.html">pointer_to_unary_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)</tt>is a <A href="UnaryFunction.html">Unary Function</A>, but not an Adaptable Unary Function: theexpressions <tt>f::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 Unary 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="unary_function.html">unary_function</A></tt>. This is an empty class, with no member functions or member variables; the onlyreason it exists is to make defining Adaptable Unary Functionsmore convenient. <tt><A href="unary_function.html">Unary_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="UnaryFunction.html">Unary Function</A>, <A href="AdaptableGenerator.html">Adaptable Generator</A>, <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</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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