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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>Generator</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>Generator</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>A Generator is a kind of <A href="functors.html">function object</A>: an object that is calledas if it were an ordinary C++ function. A Generator is called with noarguments.<h3>Refinement of</h3><A href="Assignable.html">Assignable</A><h3>Associated types</h3><Table border><TR><TD VAlign=top>Result type</TD><TD VAlign=top>The type returned when the Generator 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 Generator</TD></TR><TR><TD VAlign=top><tt>Result</tt></TD><TD VAlign=top>The result type of <tt>F</tt></TD></TR><TR><TD VAlign=top><tt>f</tt></TD><TD VAlign=top>Object of type <tt>F</tt></TD></tr></table><h3>Definitions</h3>The <i>range</i> of a Generator is the set of all possible value that it may return.<h3>Valid expressions</h3><Table border><TR><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH><TH>Return type</TH></TR><TR><TD VAlign=top>Function call</TD><TD VAlign=top><tt>f()</tt></TD><TD VAlign=top> </TD><TD VAlign=top><tt>Result</tt></TD></tr></table><h3>Expression semantics</h3><Table border><TR><TH>Name</TH><TH>Expression</TH><TH>Precondition</TH><TH>Semantics</TH><TH>Postcondition</TH></TR><TR><TD VAlign=top>Function call</TD><TD VAlign=top><tt>f()</tt></TD><TD VAlign=top> </TD><TD VAlign=top>Returns some value of type <tt>Result</tt> <A href="#1">[1]</A></TD><TD VAlign=top>The return value is in <tt>f</tt>'s range.</TD></tr></table><h3>Complexity guarantees</h3><h3>Invariants</h3><h3>Models</h3><UL><LI><tt>Result (*)()</tt></UL><h3>Notes</h3><P><A name="1">[1]</A>Two different invocations of <tt>f</tt> may return different results:a Generator may refer to local state, perform I/O, andso on. The expression <tt>f()</tt> is permitted to change <tt>f</tt>'s state; <tt>f</tt>might, for example, represent a pseudo-random number generator.<h3>See also</h3><A href="functors.html">Function Object overview</A>, <A href="UnaryFunction.html">Unary Function</A>, <A href="BinaryFunction.html">Binary Function</A>,<A href="AdaptableGenerator.html">Adaptable Generator</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> ?? 快捷鍵說明
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