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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>ptr_fun</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>ptr_fun</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 = "function.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD></TR><TR><TD Align=left><Img src = "adaptors.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right></TD></TR><TR><TD Align=left VAlign=top><b>Categories</b>: functors, adaptors</TD><TD Align=right VAlign=top><b>Component type</b>: function</TD></TR></Table><h3>Prototype</h3><pre>template <class Arg, class Result>pointer_to_unary_function<Arg, Result> ptr_fun(Result (*x)(Arg));template <class Arg1, class Arg2, class Result>pointer_to_binary_function<Arg1, Arg2, Result> ptr_fun(Result (*x)(Arg1, Arg2));</pre> <h3>Description</h3><tt>Ptr_fun</tt> takes a function pointer as its argument andreturns a function pointer adaptor, a type of <A href="functors.html">function object</A>.It is actually two different functions, not one (that is, the name<tt>ptr_fun</tt> is overloaded). If its argument is of type<tt>Result (*)(Arg)</tt> then <tt>ptr_fun</tt> creates a <tt><A href="pointer_to_unary_function.html">pointer_to_unary_function</A></tt>, and if its argument is of type<tt>Result (*)(Arg1, Arg2)</tt> then <tt>ptr_fun</tt> creates a<tt><A href="pointer_to_binary_function.html">pointer_to_binary_function</A></tt>.<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>Requirements on types</h3>The argument must be a pointer to a function that takes either one or two arguments. The argument type(s) and the return typeof the function are arbitrary, with the restriction that the functionmust return a value; it may not be a <tt>void</tt> function.<h3>Preconditions</h3><h3>Complexity</h3><h3>Example</h3>See the examples in the discussions of <tt><A href="pointer_to_unary_function.html">pointer_to_unary_function</A></tt>and <tt><A href="pointer_to_binary_function.html">pointer_to_binary_function</A></tt>.<h3>Notes</h3><h3>See also</h3><A href="functors.html">Function Objects</A>, <tt><A href="pointer_to_unary_function.html">pointer_to_unary_function</A></tt>,<tt><A href="pointer_to_binary_function.html">pointer_to_binary_function</A></tt>, <A href="AdaptableUnaryFunction.html">Adaptable Unary Function</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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