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It is provided "as is" without express or implied warranty. -- --><Head><Title>istream_iterator<T, Distance></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>istream_iterator<T, Distance></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>An <tt>istream_iterator</tt> is an <A href="InputIterator.html">Input Iterator</A> that performs formattedinput of objects of type <tt>T</tt> from a particular <tt>istream</tt>. When end ofstream is reached, the <tt>istream_iterator</tt> takes on a special <i>end ofstream</i> value, which is a past-the-end iterator. Note that all of therestrictions of an <A href="InputIterator.html">Input Iterator</A> must be obeyed, including therestrictions on the ordering of <tt>operator*</tt> and <tt>operator++</tt>operations.<h3>Example</h3>Fill a <tt><A href="Vector.html">vector</A></tt> with values read from standard input.<pre><A href="Vector.html">vector</A><int> V;<A href="copy.html">copy</A>(istream_iterator<int>(cin), istream_iterator<int>(), <A href="back_insert_iterator.html">back_inserter</A>(V)); </pre><h3>Definition</h3>Defined in the standard header <A href="iterator">iterator</A>, and in the nonstandardbackward-compatibility header <A href="iterator.h">iterator.h</A>.<h3>Template parameters</h3><Table border><TR><TH>Parameter</TH><TH>Description</TH><TH>Default</TH></TR><TR><TD VAlign=top><tt>T</tt></TD><TD VAlign=top>The <tt>istream_iterator</tt>'s value type. <tt>Operator*</tt> returns a <tt>const T&</tt>.</TD><TD VAlign=top> </TD></TR><TR><TD VAlign=top><tt>Distance</tt></TD><TD VAlign=top>The <tt>istream_iterator</tt>'s distance type.</TD><TD VAlign=top><tt>ptrdiff_t</tt></TD></tr></table><h3>Model of</h3><A href="InputIterator.html">Input Iterator</A><h3>Type requirements</h3>The value type <tt>T</tt> must be a type such that <tt>cin >> T</tt> is a valid expression. <P>The value type <tt>T</tt> must be a model of <A href="DefaultConstructible.html">Default Constructible</A>.<P>The distance type must, as described in the<A href="InputIterator.html">Input Iterator</A> requirements, be a signed integral type.<h3>Public base classes</h3>None.<h3>Members</h3><Table border><TR><TH>Member</TH><TH>Where defined</TH><TH>Description</TH></TR><TR><TD VAlign=top><tt>istream_iterator()</tt></TD><TD VAlign=top><tt>istream_iterator</tt></TD><TD VAlign=top>See below.</TD></TR><TR><TD VAlign=top><tt>istream_iterator(istream&)</tt></TD><TD VAlign=top><tt>istream_iterator</tt></TD><TD VAlign=top>See below.</TD></TR><TR><TD VAlign=top><tt>istream_iterator(const istream_iterator&)</tt></TD><TD VAlign=top> <A href="trivial.html">Trivial Iterator</A></TD><TD VAlign=top>The copy constructor</TD></TR><TR><TD VAlign=top><tt>istream_iterator& operator=(const istream_iterator&)</tt></TD><TD VAlign=top> <A href="trivial.html">Trivial Iterator</A></TD><TD VAlign=top>The assignment operator</TD></TR><TR><TD VAlign=top><tt>const T& operator*() const</tt></TD><TD VAlign=top> <A href="InputIterator.html">Input Iterator</A></TD><TD VAlign=top>Returns the next object in the stream.</TD></TR><TR><TD VAlign=top><tt>istream_iterator& operator++()</tt></TD><TD VAlign=top> <A href="InputIterator.html">Input Iterator</A></TD><TD VAlign=top>Preincrement.</TD></TR><TR><TD VAlign=top><tt>istream_iterator& operator++(int)</tt></TD><TD VAlign=top> <A href="InputIterator.html">Input Iterator</A></TD><TD VAlign=top>Postincrement.</TD></TR><TR><TD VAlign=top><tt>bool operator==(const istream_iterator&, const istream_iterator&)</tt></TD><TD VAlign=top> <A href="trivial.html">Trivial iterator</A></TD><TD VAlign=top>The equality operator. This is a global function, not a member function.</TD></TR><TR><TD VAlign=top><tt>input_iterator_tag iterator_category(const istream_iterator&)</tt></TD><TD VAlign=top> <A href="iterator_tags.html">iterator tags</A></TD><TD VAlign=top>Returns the iterator's category.</TD></TR><TR><TD VAlign=top><tt>T* value_type(const istream_iterator&)</tt></TD><TD VAlign=top> <A href="iterator_tags.html">iterator tags</A></TD><TD VAlign=top>Returns the iterator's value type.</TD></TR><TR><TD VAlign=top><tt>Distance* distance_type(const istream_iterator&)</tt></TD><TD VAlign=top> <A href="iterator_tags.html">iterator tags</A></TD><TD VAlign=top>Returns the iterator's distance type.<</TD></tr></table><h3>New members</h3>These members are not defined in the <A href="InputIterator.html">Input Iterator</A> requirements,but are specific to <tt>istream_iterator</tt>.<Table border><TR><TH>Function</TH><TH>Description</TH></TR><TR><TD VAlign=top><tt>istream_iterator()</tt></TD><TD VAlign=top>The default constructor: Constructs an end-of-stream iterator. This is a past-the-end iterator, and it is useful when constructing a "range". </TD></TR><TR><TD VAlign=top><tt>istream_iterator(istream& s)</tt></TD><TD VAlign=top>Creates an <tt>istream_iterator</tt> that reads values from the input stream <tt>s</tt>. When <tt>s</tt> reaches end of stream, this iterator will compare equal to an end-of-stream iterator created using the default constructor.</TD></tr></table><h3>Notes</h3><h3>See also</h3><A href="ostream_iterator.html">ostream_iterator</A>, <A href="InputIterator.html">Input Iterator</A>, <A href="OutputIterator.html">Output Iterator</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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