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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>input_iterator_tag</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>input_iterator_tag</H1><Table CellPadding=0 CellSpacing=0 width=100%><TR><TD Align=left><Img src = "iterators.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right><Img src = "type.gif" Alt="" WIDTH = "194" HEIGHT = "39" ></TD></TR><TR><TD Align=left VAlign=top><b>Category</b>: iterators</TD><TD Align=right VAlign=top><b>Component type</b>: type</TD></TR></Table><h3>Description</h3><tt>Input_iterator_tag</tt> is an empty class: it has no member functions,member variables, or nested types. It is used solely as a "tag": arepresentation of the <A href="InputIterator.html">Input Iterator</A> concept within the C++ typesystem. Specifically, it is used as a return value for the function<tt><A href="iterator_category.html">iterator_category</A></tt>. <tt><A href="iterator_category.html">Iterator_category</A></tt> takes a singleargument, an iterator, and returns an object whose type depends on theiterator's category. <tt><A href="iterator_category.html">Iterator_category</A></tt>'s return value is oftype <tt>input_iterator_tag</tt> if its argument is an <A href="InputIterator.html">Input Iterator</A>.<h3>Example</h3>See <tt><A href="iterator_category.html">iterator_category</A></tt><h3>Definition</h3>Defined in the standard header <A href="iterator">iterator</A>, and in thenonstandard backward-compatibility header <A href="iterator.h">iterator.h</A>.<h3>Template parameters</h3>None.<h3>Model of</h3><A href="Assignable.html">Assignable</A><h3>Type requirements</h3>None.<h3>Public base classes</h3>None.<h3>Members</h3>None.<h3>New Members</h3>None.<h3>Notes</h3><h3>See also</h3><tt><A href="iterator_category.html">iterator_category</A></tt>, <A href="iterator_tags.html">Iterator Tags</A>,<tt><A href="iterator_traits.html">iterator_traits</A></tt>,<tt><A href="output_iterator_tag.html">output_iterator_tag</A></tt>,<tt><A href="forward_iterator_tag.html">forward_iterator_tag</A></tt>, <tt><A href="bidirectional_iterator_tag.html">bidirectional_iterator_tag</A></tt>,<tt><A href="random_access_iterator_tag.html">random_access_iterator_tag</A></tt><!--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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