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 <H2>istream_iterator</H2>
 <P><B>Library:</B>&nbsp;&nbsp;<A HREF="2-8.html">Iterators</A></P>

 <PRE><HR><B><I>istream_iterator</I></B> <IMG SRC="images/inherits.gif"> <B><I><A HREF="iterator.html">iterator</A></I></B><HR></PRE>

 <UL>
 <LI><A HREF="#sec1">Local Index</A></LI>
 <LI><A HREF="#sec2">Summary</A></LI>
 <LI><A HREF="#sec3">Synopsis</A></LI>
 <LI><A HREF="#sec4">Description</A></LI>
 <LI><A HREF="#sec5">Interface</A></LI>
 <LI><A HREF="#sec6">Member Types</A></LI>
 <LI><A HREF="#sec7">Constructors</A></LI>
 <LI><A HREF="#sec8">Operators</A></LI>
 <LI><A HREF="#sec9">Nonmember Operators</A></LI>
 <LI><A HREF="#sec10">Example</A></LI>
 <LI><A HREF="#sec11">See Also</A></LI>
 <LI><A HREF="#sec12">Standards Conformance</A></LI>
 </UL>
 <A NAME="sec1"><H3>Local Index</H3></A>
 <H4>Members</H4>
 <UL><TABLE CELLPADDING=3>
 <TR><TD VALIGN=top>
 <A HREF="#idx717">char_type</A><BR>
 <A HREF="#idx720">istream_iterator()</A><BR>
 </TD>
 <TD VALIGN=top><A HREF="#idx719">istream_type</A><BR>
 <A HREF="#idx723">operator*()</A><BR>
 </TD>
 <TD VALIGN=top><A HREF="#idx725">operator++()</A><BR>
 <A HREF="#idx724">operator-&gt;()</A><BR>
 </TD>
 <TD VALIGN=top><A HREF="#idx718">traits_type</A><BR>
 </TD></TR>
 </TABLE></UL>
 <H4>Non-Members</H4>
 <UL><TABLE CELLPADDING=3>
 <TR><TD VALIGN=top>
 <A HREF="#idx727">operator!=()</A><BR>
 </TD>
 <TD VALIGN=top><A HREF="#idx726">operator==()</A><BR>
 </TD>
 <TD VALIGN=top></TD></TR>
 </TABLE></UL>

 <A NAME="sec2"><H3>Summary</H3></A>
 <P>A stream iterator that has iterator capabilities for istreams. This iterator allows generic algorithms to be used directly on streams.</P>
 <A NAME="sec3"><H3>Synopsis</H3></A>

 <PRE>#include &lt;iterator&gt;

 namespace std {
   template &lt;class T, class charT,
             class traits = char_traits&lt;charT&gt;,
             class Distance = ptrdiff_t&gt;
   class istream_iterator :
           public iterator&lt;input_iterator_tag, T,
                           Distance, const T*, const T&amp;&gt;;
 }
 </PRE>
 <A NAME="sec4"><H3>Description</H3></A>
 <P>Stream iterators are the standard iterator interface for input and output streams.</P>
 <P>The class template  <B><I>istream_iterator</I></B> reads elements from an input stream using <SAMP>operator &gt;&gt;()</SAMP>. A value of type <SAMP>T</SAMP> is retrieved and stored when the iterator is constructed and each time <SAMP>operator++()</SAMP> is called. The iterator is equal to the end-of-stream iterator value if the end-of-file is reached. You can use the constructor with no arguments to create an end-of-stream iterator. The only valid use of this iterator is to compare to other iterators when checking for end of file. Do not attempt to dereference the end-of-stream iterator; it plays the same role as the past-the-end iterator of the <SAMP>end()</SAMP> function of containers. Since an <B><I>istream_iterator</I></B> is an input iterator, you cannot assign to the value returned by dereferencing the iterator. This also means that <B><I>istream_iterators</I></B> can only be used for single pass algorithms.</P>
 <P>Since a new value is read every time the<SAMP> operator++()</SAMP> is used on an <B><I>istream_iterator</I></B>, that operation is not equality-preserving. This means that <SAMP>i == j </SAMP>does <I>not </I>mean that <SAMP>++i == ++j</SAMP> (although two end-of-stream iterators are always equal).</P>
 <A NAME="sec5"><H3>Interface</H3></A>

 <UL><PRE>namespace std {
   template &lt;class T, class charT,
             class traits = char_traits&lt;charT&gt;,
             class Distance = ptrdiff_t&gt;
   class istream_iterator :
            public iterator&lt;input_iterator_tag, T, Distance,
                            const T*, const T&amp;&gt;
   {

     public:
       typedef T value_type;
       typedef charT char_type;
       typedef traits traits_type;
       typedef basic_istream&lt;charT,traits&gt; istream_type;

       istream_iterator();
       istream_iterator(istream_type&amp;);
       istream_iterator(const stream_iterator&amp;);

       const T&amp; operator*() const;
       const T* operator-&gt;() const;
       istream_iterator&amp; operator++();
       istream_iterator  operator++(int);
   };

   // Nonmember Operators

   template &lt;class T, class charT, class traits,class Distance&gt;
   bool operator==(const istream_iterator&lt;T,charT,traits,Distance&gt;&amp;,
           const istream_iterator&lt;T,charT,traits,Distance&gt;&amp;);

   template &lt;class T, class charT, class traits,class Distance&gt;
   bool operator!=(const istream_iterator&lt;T,charT,traits,Distance&gt;&amp;,
           const istream_iterator&lt;T,charT,traits,Distance&gt;&amp;);
 }
 </PRE></UL>
 <A NAME="sec6"><H3>Member Types</H3></A>

 <A NAME="idx717"></A><PRE><B>char_type</B>; </PRE>
 <UL>
 <P>Type of character the stream is built on.</P>
 </UL>


 <A NAME="idx718"></A><PRE><B>traits_type</B>; </PRE>
 <UL>
 <P>Traits used to build the stream.</P>
 </UL>


 <A NAME="idx719"></A><PRE><B>istream_type</B>; </PRE>
 <UL>
 <P>Type of stream this iterator is constructed on.</P>
 </UL>

 <A NAME="sec7"><H3>Constructors</H3></A>

 <A NAME="idx720"></A><PRE><B>istream_iterator</B>();</PRE>
 <UL>
 <P>Constructs an end-of-stream iterator. This iterator can be used to compare against an end-of-stream condition. Use it to provide end iterators to algorithms.</P>
 </UL>


 <A NAME="idx721"></A><PRE><B>istream_iterator</B>(istream_type&amp; s);</PRE>
 <UL>
 <P>Constructs an <B><I>istream_iterator</I></B> on the given stream.</P>
 </UL>


 <A NAME="idx722"></A><PRE><B>istream_iterator</B>(const istream_iterator&amp; x);</PRE>
 <UL>
 <P>Copy constructor.</P>
 </UL>

 <A NAME="sec8"><H3>Operators</H3></A>

 <A NAME="idx723"></A><PRE>const T&amp;
 <B>operator*</B>() const;</PRE>
 <UL>
 <P>Returns the current value stored by the iterator.</P>
 </UL>


 <A NAME="idx724"></A><PRE>const T*
 <B>operator-&gt;</B>() const;</PRE>
 <UL>
 <P>Returns a pointer to the current value stored by the iterator.</P>
 </UL>


 <A NAME="idx725"></A><PRE>istream_iterator&amp; <B>operator++</B>()
 istream_iterator <B>operator++</B>(int)</PRE>
 <UL>
 <P>Retrieves the next element from the input stream. </P>
 </UL>

 <A NAME="sec9"><H3>Nonmember Operators</H3></A>

 <A NAME="idx726"></A><PRE>template &lt;class T, class charT, class traits, class Distance&gt;
 bool
 <B>operator==</B>(const istream_iterator&lt;T,charT,traits,
             Distance&gt;&amp; x,
             const
             istream_iterator&lt;T,charT,traits,Distance&gt;&amp; y)</PRE>
 <UL>
 <P>Returns <SAMP>true</SAMP> if <SAMP>x</SAMP> and <SAMP>y</SAMP> both refer to the same stream or are both past-the-end.</P>
 </UL>


 <A NAME="idx727"></A><PRE>template &lt;class T, class charT, class traits, class Distance&gt;
 bool
 <B>operator!=</B>(const istream_iterator&lt;T,charT,traits,Distance&gt;&amp; x,
            const istream_iterator&lt;T,charT,traits,Distance&gt;&amp; y)</PRE>
 <UL>
 <P>Returns <SAMP>!(x == y)</SAMP>.</P>
 </UL>

 <A NAME="sec10"><H3>Example</H3></A>

 <UL><PRE>//
 //  io_iter.cpp
 //

 #include &lt;algorithm&gt;  // for copy
 #include &lt;iostream&gt;   // for cin, cout, endl
 #include &lt;iterator&gt;   // for stream_iterators, inserter
 #include &lt;vector&gt;     // for vector
 #include &lt;numeric&gt;    // for accumulate


 int main ()
 {
     // Typedefs for convenience.
     typedef std::vector&lt;int, std::allocator&lt;int&gt; &gt;    Vector;

     typedef std::istream_iterator&lt;Vector::value_type,
                          char, std::char_traits&lt;char&gt;,
                          ptrdiff_t&gt;                   is_iter;

     typedef std::ostream_iterator&lt;Vector::value_type, char,
                          std::char_traits&lt;char&gt; &gt;     os_iter;

     Vector v;

     Vector::value_type sum = 0;

     // Collect values from cin until end of file
     // Note use of default constructor to get ending iterator
     std::cout &lt;&lt; "Enter a sequence of integers (eof to quit): ";
     std::copy (is_iter (std::cin), is_iter (),
                std::inserter (v, v.begin ()));

     // Stream the whole vector and the sum to cout.
     std::copy (v.begin (), v.end () -1,
                os_iter (std::cout, " + "));

     if (v.size ())
         std::cout &lt;&lt; v.back () &lt;&lt; " = "
                   &lt;&lt; std::accumulate (v.begin (), v.end (), sum)
                   &lt;&lt; std::endl;

     return 0;
 }


 Program Output:
 </PRE></UL>
 <UL><PRE>Enter a sequence of integers (eof to quit): 1 + 1 + 2 + 3 + 5 +
 8 + 13 + 21 + 45 + 66 + 111 + 177 = 453
 </PRE></UL>
 <A NAME="sec11"><H3>See Also</H3></A>
 <P><A HREF="iterators.html">Iterators</A>, <B><I><A HREF="ostream-iterator.html">ostream_iterator</A></I></B></P>
 <A NAME="sec12"><H3>Standards Conformance</H3></A>
 <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 24.5.1</I></P>

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	<A HREF="istream-h.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="istreambuf-iterator.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library Reference Guide</B></DIV>
	<H2>istream_iterator</H2>
	<P><B>Library:</B>  <A HREF="2-8.html">Iterators</A></P>

	<PRE><HR><B><I>istream_iterator</I></B> <IMG SRC="images/inherits.gif"> <B><I><A HREF="iterator.html">iterator</A></I></B><HR></PRE>

	<UL>
	<LI><A HREF="#sec1">Local Index</A></LI>
	<LI><A HREF="#sec2">Summary</A></LI>
	<LI><A HREF="#sec3">Synopsis</A></LI>
	<LI><A HREF="#sec4">Description</A></LI>
	<LI><A HREF="#sec5">Interface</A></LI>
	<LI><A HREF="#sec6">Member Types</A></LI>
	<LI><A HREF="#sec7">Constructors</A></LI>
	<LI><A HREF="#sec8">Operators</A></LI>
	<LI><A HREF="#sec9">Nonmember Operators</A></LI>
	<LI><A HREF="#sec10">Example</A></LI>
	<LI><A HREF="#sec11">See Also</A></LI>
	<LI><A HREF="#sec12">Standards Conformance</A></LI>
	</UL>
	<A NAME="sec1"><H3>Local Index</H3></A>
	<H4>Members</H4>
	<UL><TABLE CELLPADDING=3>
	<TR><TD VALIGN=top>
	<A HREF="#idx717">char_type</A><BR>
	<A HREF="#idx720">istream_iterator()</A><BR>
	</TD>
	<TD VALIGN=top><A HREF="#idx719">istream_type</A><BR>
	<A HREF="#idx723">operator*()</A><BR>
	</TD>
	<TD VALIGN=top><A HREF="#idx725">operator++()</A><BR>
	<A HREF="#idx724">operator->()</A><BR>
	</TD>
	<TD VALIGN=top><A HREF="#idx718">traits_type</A><BR>
	</TD></TR>
	</TABLE></UL>
	<H4>Non-Members</H4>
	<UL><TABLE CELLPADDING=3>
	<TR><TD VALIGN=top>
	<A HREF="#idx727">operator!=()</A><BR>
	</TD>
	<TD VALIGN=top><A HREF="#idx726">operator==()</A><BR>
	</TD>
	<TD VALIGN=top></TD></TR>
	</TABLE></UL>

	<A NAME="sec2"><H3>Summary</H3></A>
	<P>A stream iterator that has iterator capabilities for istreams. This iterator allows generic algorithms to be used directly on streams.</P>
	<A NAME="sec3"><H3>Synopsis</H3></A>

	<PRE>#include <iterator>

	namespace std {
	template <class T, class charT,
	class traits = char_traits<charT>,
	class Distance = ptrdiff_t>
	class istream_iterator :
	public iterator<input_iterator_tag, T,
	Distance, const T*, const T&>;
	}
	</PRE>
	<A NAME="sec4"><H3>Description</H3></A>
	<P>Stream iterators are the standard iterator interface for input and output streams.</P>
	<P>The class template <B><I>istream_iterator</I></B> reads elements from an input stream using <SAMP>operator >>()</SAMP>. A value of type <SAMP>T</SAMP> is retrieved and stored when the iterator is constructed and each time <SAMP>operator++()</SAMP> is called. The iterator is equal to the end-of-stream iterator value if the end-of-file is reached. You can use the constructor with no arguments to create an end-of-stream iterator. The only valid use of this iterator is to compare to other iterators when checking for end of file. Do not attempt to dereference the end-of-stream iterator; it plays the same role as the past-the-end iterator of the <SAMP>end()</SAMP> function of containers. Since an <B><I>istream_iterator</I></B> is an input iterator, you cannot assign to the value returned by dereferencing the iterator. This also means that <B><I>istream_iterators</I></B> can only be used for single pass algorithms.</P>
	<P>Since a new value is read every time the<SAMP> operator++()</SAMP> is used on an <B><I>istream_iterator</I></B>, that operation is not equality-preserving. This means that <SAMP>i == j </SAMP>does <I>not </I>mean that <SAMP>++i == ++j</SAMP> (although two end-of-stream iterators are always equal).</P>
	<A NAME="sec5"><H3>Interface</H3></A>

	<UL><PRE>namespace std {
	template <class T, class charT,
	class traits = char_traits<charT>,
	class Distance = ptrdiff_t>
	class istream_iterator :
	public iterator<input_iterator_tag, T, Distance,
	const T*, const T&>
	{

	public:
	typedef T value_type;
	typedef charT char_type;
	typedef traits traits_type;
	typedef basic_istream<charT,traits> istream_type;

	istream_iterator();
	istream_iterator(istream_type&);
	istream_iterator(const stream_iterator&);

	const T& operator*() const;
	const T* operator->() const;
	istream_iterator& operator++();
	istream_iterator operator++(int);
	};

	// Nonmember Operators

	template <class T, class charT, class traits,class Distance>
	bool operator==(const istream_iterator<T,charT,traits,Distance>&,
	const istream_iterator<T,charT,traits,Distance>&);

	template <class T, class charT, class traits,class Distance>
	bool operator!=(const istream_iterator<T,charT,traits,Distance>&,
	const istream_iterator<T,charT,traits,Distance>&);
	}
	</PRE></UL>
	<A NAME="sec6"><H3>Member Types</H3></A>

	<A NAME="idx717"></A><PRE><B>char_type</B>; </PRE>
	<UL>
	<P>Type of character the stream is built on.</P>
	</UL>


	<A NAME="idx718"></A><PRE><B>traits_type</B>; </PRE>
	<UL>
	<P>Traits used to build the stream.</P>
	</UL>


	<A NAME="idx719"></A><PRE><B>istream_type</B>; </PRE>
	<UL>
	<P>Type of stream this iterator is constructed on.</P>
	</UL>

	<A NAME="sec7"><H3>Constructors</H3></A>

	<A NAME="idx720"></A><PRE><B>istream_iterator</B>();</PRE>
	<UL>
	<P>Constructs an end-of-stream iterator. This iterator can be used to compare against an end-of-stream condition. Use it to provide end iterators to algorithms.</P>
	</UL>


	<A NAME="idx721"></A><PRE><B>istream_iterator</B>(istream_type& s);</PRE>
	<UL>
	<P>Constructs an <B><I>istream_iterator</I></B> on the given stream.</P>
	</UL>


	<A NAME="idx722"></A><PRE><B>istream_iterator</B>(const istream_iterator& x);</PRE>
	<UL>
	<P>Copy constructor.</P>
	</UL>

	<A NAME="sec8"><H3>Operators</H3></A>

	<A NAME="idx723"></A><PRE>const T&
	<B>operator*</B>() const;</PRE>
	<UL>
	<P>Returns the current value stored by the iterator.</P>
	</UL>


	<A NAME="idx724"></A><PRE>const T*
	<B>operator-></B>() const;</PRE>
	<UL>
	<P>Returns a pointer to the current value stored by the iterator.</P>
	</UL>


	<A NAME="idx725"></A><PRE>istream_iterator& <B>operator++</B>()
	istream_iterator <B>operator++</B>(int)</PRE>
	<UL>
	<P>Retrieves the next element from the input stream. </P>
	</UL>

	<A NAME="sec9"><H3>Nonmember Operators</H3></A>

	<A NAME="idx726"></A><PRE>template <class T, class charT, class traits, class Distance>
	bool
	<B>operator==</B>(const istream_iterator<T,charT,traits,
	Distance>& x,
	const
	istream_iterator<T,charT,traits,Distance>& y)</PRE>
	<UL>
	<P>Returns <SAMP>true</SAMP> if <SAMP>x</SAMP> and <SAMP>y</SAMP> both refer to the same stream or are both past-the-end.</P>
	</UL>


	<A NAME="idx727"></A><PRE>template <class T, class charT, class traits, class Distance>
	bool
	<B>operator!=</B>(const istream_iterator<T,charT,traits,Distance>& x,
	const istream_iterator<T,charT,traits,Distance>& y)</PRE>
	<UL>
	<P>Returns <SAMP>!(x == y)</SAMP>.</P>
	</UL>

	<A NAME="sec10"><H3>Example</H3></A>

	<UL><PRE>//
	// io_iter.cpp
	//

	#include <algorithm> // for copy
	#include <iostream> // for cin, cout, endl
	#include <iterator> // for stream_iterators, inserter
	#include <vector> // for vector
	#include <numeric> // for accumulate


	int main ()
	{
	// Typedefs for convenience.
	typedef std::vector<int, std::allocator<int> > Vector;

	typedef std::istream_iterator<Vector::value_type,
	char, std::char_traits<char>,
	ptrdiff_t> is_iter;

	typedef std::ostream_iterator<Vector::value_type, char,
	std::char_traits<char> > os_iter;

	Vector v;

	Vector::value_type sum = 0;

	// Collect values from cin until end of file
	// Note use of default constructor to get ending iterator
	std::cout << "Enter a sequence of integers (eof to quit): ";
	std::copy (is_iter (std::cin), is_iter (),
	std::inserter (v, v.begin ()));

	// Stream the whole vector and the sum to cout.
	std::copy (v.begin (), v.end () -1,
	os_iter (std::cout, " + "));

	if (v.size ())
	std::cout << v.back () << " = "
	<< std::accumulate (v.begin (), v.end (), sum)
	<< std::endl;

	return 0;
	}


	Program Output:
	</PRE></UL>
	<UL><PRE>Enter a sequence of integers (eof to quit): 1 + 1 + 2 + 3 + 5 +
	8 + 13 + 21 + 45 + 66 + 111 + 177 = 453
	</PRE></UL>
	<A NAME="sec11"><H3>See Also</H3></A>
	<P><A HREF="iterators.html">Iterators</A>, <B><I><A HREF="ostream-iterator.html">ostream_iterator</A></I></B></P>
	<A NAME="sec12"><H3>Standards Conformance</H3></A>
	<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 24.5.1</I></P>

	<BR>
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