doc/stdlibref/ostreambuf-iterator.html - stdcxx - Git at Google

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

 <PRE><HR><B><I>ostreambuf_iterator</I></B> <IMG SRC="images/inherits.gif"> <B><I>output_iterator</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">Member Operators</A></LI>
 <LI><A HREF="#sec9">Public Member Functions</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="#idx1068">char_type</A><BR>
 <A HREF="#idx1078">failed()</A><BR>
 <A HREF="#idx1077">operator*()</A><BR>
 </TD>
 <TD VALIGN=top><A HREF="#idx1075">operator++()</A><BR>
 <A HREF="#idx1074">operator=()</A><BR>
 <A HREF="#idx1072">ostreambuf_iterator()</A><BR>
 </TD>
 <TD VALIGN=top><A HREF="#idx1069">ostream_type</A><BR>
 <A HREF="#idx1070">streambuf_type</A><BR>
 <A HREF="#idx1071">traits_type</A><BR>
 </TD>
 <TD VALIGN=top></TD></TR>
 </TABLE></UL>

 <A NAME="sec2"><H3>Summary</H3></A>
 <P>Writes successive characters onto the stream buffer object from which it was constructed</P>
 <A NAME="sec3"><H3>Synopsis</H3></A>

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

 namespace std {
   template&lt;class charT, class traits = char_traits&lt;charT&gt; &gt;
   class ostreambuf_iterator;
 }
 </PRE>
 <A NAME="sec4"><H3>Description</H3></A>
 <P>The class template <B><I>ostreambuf_iterator</I></B> writes successive characters onto the stream buffer object from which it was constructed. <SAMP>operator=()</SAMP> is used to write the characters. In case of failure, the member function <SAMP>failed()</SAMP> returns <SAMP>true</SAMP>. </P>
 <A NAME="sec5"><H3>Interface</H3></A>

 <UL><PRE>namespace std {

   template&lt;class charT, class traits = char_traits&lt;charT&gt; &gt;
   class ostreambuf_iterator
     : public iterator &lt;output_iterator_tag, void,
                        void, void, void&gt;
   {
   public:

     typedef charT char_type;
     typedef traits traits_type;
     typedef basic_streambuf&lt;charT, traits&gt; streambuf_type;
     typedef basic_ostream&lt;charT, traits&gt; ostream_type;

     ostreambuf_iterator(ostream_type&amp; s) throw();
     ostreambuf_iterator(streambuf_type *s) throw();
     ostreambuf_iterator&amp; operator=(char_type c);

     ostreambuf_iterator&amp; operator*();
     ostreambuf_iterator&amp; operator++();
     ostreambuf_iterator operator++(int);

     bool failed( ) const throw();

   };
 }
 </PRE></UL>
 <A NAME="sec6"><H3>Member Types</H3></A>

 <A NAME="idx1068"></A><PRE><B>char_type</B></PRE>
 <UL>
 <P>The type <SAMP>char_type</SAMP> is a synonym for the template parameter <SAMP>charT</SAMP>.</P>
 </UL>


 <A NAME="idx1069"></A><PRE><B>ostream_type</B></PRE>
 <UL>
 <P>The type <SAMP>ostream_type</SAMP> is a synonym for the type <SAMP>basic_ostream&lt;char_type, traits_type&gt;</SAMP>.</P>
 </UL>


 <A NAME="idx1070"></A><PRE><B>streambuf_type</B></PRE>
 <UL>
 <P>The type <SAMP>streambuf_type</SAMP> is a synonym for the type <SAMP>basic_streambuf&lt;char_type, traits_type&gt;</SAMP>.</P>
 </UL>


 <A NAME="idx1071"></A><PRE><B>traits_type</B></PRE>
 <UL>
 <P>The type <SAMP>traits_type</SAMP> is a synonym for the template parameter <SAMP>traits</SAMP>.</P>
 </UL>

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

 <A NAME="idx1072"></A><PRE><B>ostreambuf_iterator</B>(ostream_type&amp; s) throw();</PRE>
 <UL>
 <P>Constructs an <B><I>ostreambuf_iterator</I></B> that uses the <B><I><A HREF="basic-streambuf.html">basic_streambuf</A></I></B> object pointed to by <SAMP>s.rdbuf()</SAMP>to output characters. If <SAMP>s.rdbuf()</SAMP> is a null pointer, calls to the member function <SAMP>failed()</SAMP> return <SAMP>true</SAMP>.</P>
 </UL>


 <A NAME="idx1073"></A><PRE><B>ostreambuf_iterator</B>(streambuf_type *s) throw();</PRE>
 <UL>
 <P>Constructs an <B><I>ostreambuf_iterator</I></B> that uses the <B><I><A HREF="basic-streambuf.html">basic_streambuf</A></I></B> object pointed to by <SAMP>s</SAMP> to output characters. If <SAMP>s</SAMP> is a null pointer, calls to the member function<SAMP> failed()</SAMP> return <SAMP>true</SAMP>.</P>
 </UL>

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

 <A NAME="idx1074"></A><PRE>ostreambuf_iterator&amp;
 <B>operator=</B>(char_type c); </PRE>
 <UL>
 <P>Inserts the character <SAMP>c</SAMP> into the output sequence of the attached stream buffer. If the operation fails, calls to the member function <SAMP>failed()</SAMP> return <SAMP>true</SAMP>.</P>
 </UL>


 <A NAME="idx1075"></A><PRE>ostreambuf_iterator&amp;
 <B>operator++</B>();</PRE>
 <UL>
 <P>Returns <SAMP>*this</SAMP>.</P>
 </UL>


 <A NAME="idx1076"></A><PRE>ostreambuf_iterator
 <B>operator++</B>(int); </PRE>
 <UL>
 <P>Returns <SAMP>*this</SAMP>. </P>
 </UL>


 <A NAME="idx1077"></A><PRE>ostreambuf_iterator
 <B>operator*</B>();</PRE>
 <UL>
 <P>Returns <SAMP>*this</SAMP>. </P>
 </UL>

 <A NAME="sec9"><H3>Public Member Functions</H3></A>

 <A NAME="idx1078"></A><PRE>bool
 <B>failed</B>() const
   throw();</PRE>
 <UL>
 <P>Returns <SAMP>true</SAMP> if the iterator failed while inserting a character. Otherwise returns <SAMP>false</SAMP>. </P>
 </UL>

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

 <UL><PRE>//
 //  ostreambuf_iterator.cpp
 //

 #include &lt;iostream&gt;   // for cout, endl
 #include &lt;iterator&gt;   // for istreambuf_iterator,
                       //     ostreambuf_iterator
 #include &lt;fstream&gt;    // for filebuf

 #include &lt;stdio.h&gt;    // for tmpnam and remove


 int main ( )
 {
     char namebuf [L_tmpnam];

     // create a temporary filename
     const char *fname = tmpnam (namebuf);

     if (!fname)
         return 1;

     // create a filebuf object
     std::filebuf buf;

     // open the file and link it to the filebuf object
     buf.open (fname, std::ios::in | std::ios::out |
                      std::ios::trunc);

     // create an ostreambuf_iterator and link it to
     // the filebuf object
     std::ostreambuf_iterator&lt;char, std::char_traits&lt;char&gt; &gt;
                             out_iter (&amp;buf);

     // output into the file using the ostreambuf_iterator
     for (char i = 64; i &lt; 127; i++)
         out_iter = i;

     // seek to the beginning of the file
     buf.pubseekpos(0);

     // create an istreambuf_iterator and link it to
     // the filebuf object
     std::istreambuf_iterator&lt;char, std::char_traits&lt;char&gt; &gt;
                             in_iter (&amp;buf);

     // construct an end of stream iterator
     std::istreambuf_iterator&lt;char, std::char_traits&lt;char&gt; &gt;
                             end;

     std::cout &lt;&lt; std::endl;

     // output the contents of the file
     while (!in_iter.equal (end))
         std::cout &lt;&lt; *in_iter++;

     std::cout &lt;&lt; std::endl;

     // remove temporary file
     remove (fname);

     return 0;
 }


 Program Output:
 </PRE></UL>
 <UL><PRE>
 @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
 </PRE></UL>
 <A NAME="sec11"><H3>See Also</H3></A>
 <P><B><I><A HREF="basic-streambuf.html">basic_streambuf</A></I></B>, <B><I><A HREF="basic-ostream.html">basic_ostream</A></I></B>, <B><I><A HREF="istreambuf-iterator.html">istreambuf_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 24.5.4</I></P>

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	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
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	<HTML>
	<HEAD>
	<TITLE>ostreambuf_iterator</TITLE>
	<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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	<A HREF="ostream-iterator.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="ostrstream.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>ostreambuf_iterator</H2>
	<P><B>Library:</B>  <A HREF="2-8.html">Iterators</A></P>

	<PRE><HR><B><I>ostreambuf_iterator</I></B> <IMG SRC="images/inherits.gif"> <B><I>output_iterator</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">Member Operators</A></LI>
	<LI><A HREF="#sec9">Public Member Functions</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="#idx1068">char_type</A><BR>
	<A HREF="#idx1078">failed()</A><BR>
	<A HREF="#idx1077">operator*()</A><BR>
	</TD>
	<TD VALIGN=top><A HREF="#idx1075">operator++()</A><BR>
	<A HREF="#idx1074">operator=()</A><BR>
	<A HREF="#idx1072">ostreambuf_iterator()</A><BR>
	</TD>
	<TD VALIGN=top><A HREF="#idx1069">ostream_type</A><BR>
	<A HREF="#idx1070">streambuf_type</A><BR>
	<A HREF="#idx1071">traits_type</A><BR>
	</TD>
	<TD VALIGN=top></TD></TR>
	</TABLE></UL>

	<A NAME="sec2"><H3>Summary</H3></A>
	<P>Writes successive characters onto the stream buffer object from which it was constructed</P>
	<A NAME="sec3"><H3>Synopsis</H3></A>

	<PRE>#include <iterator>

	namespace std {
	template<class charT, class traits = char_traits<charT> >
	class ostreambuf_iterator;
	}
	</PRE>
	<A NAME="sec4"><H3>Description</H3></A>
	<P>The class template <B><I>ostreambuf_iterator</I></B> writes successive characters onto the stream buffer object from which it was constructed. <SAMP>operator=()</SAMP> is used to write the characters. In case of failure, the member function <SAMP>failed()</SAMP> returns <SAMP>true</SAMP>. </P>
	<A NAME="sec5"><H3>Interface</H3></A>

	<UL><PRE>namespace std {

	template<class charT, class traits = char_traits<charT> >
	class ostreambuf_iterator
	: public iterator <output_iterator_tag, void,
	void, void, void>
	{
	public:

	typedef charT char_type;
	typedef traits traits_type;
	typedef basic_streambuf<charT, traits> streambuf_type;
	typedef basic_ostream<charT, traits> ostream_type;

	ostreambuf_iterator(ostream_type& s) throw();
	ostreambuf_iterator(streambuf_type *s) throw();
	ostreambuf_iterator& operator=(char_type c);

	ostreambuf_iterator& operator*();
	ostreambuf_iterator& operator++();
	ostreambuf_iterator operator++(int);

	bool failed( ) const throw();

	};
	}
	</PRE></UL>
	<A NAME="sec6"><H3>Member Types</H3></A>

	<A NAME="idx1068"></A><PRE><B>char_type</B></PRE>
	<UL>
	<P>The type <SAMP>char_type</SAMP> is a synonym for the template parameter <SAMP>charT</SAMP>.</P>
	</UL>


	<A NAME="idx1069"></A><PRE><B>ostream_type</B></PRE>
	<UL>
	<P>The type <SAMP>ostream_type</SAMP> is a synonym for the type <SAMP>basic_ostream<char_type, traits_type></SAMP>.</P>
	</UL>


	<A NAME="idx1070"></A><PRE><B>streambuf_type</B></PRE>
	<UL>
	<P>The type <SAMP>streambuf_type</SAMP> is a synonym for the type <SAMP>basic_streambuf<char_type, traits_type></SAMP>.</P>
	</UL>


	<A NAME="idx1071"></A><PRE><B>traits_type</B></PRE>
	<UL>
	<P>The type <SAMP>traits_type</SAMP> is a synonym for the template parameter <SAMP>traits</SAMP>.</P>
	</UL>

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

	<A NAME="idx1072"></A><PRE><B>ostreambuf_iterator</B>(ostream_type& s) throw();</PRE>
	<UL>
	<P>Constructs an <B><I>ostreambuf_iterator</I></B> that uses the <B><I><A HREF="basic-streambuf.html">basic_streambuf</A></I></B> object pointed to by <SAMP>s.rdbuf()</SAMP>to output characters. If <SAMP>s.rdbuf()</SAMP> is a null pointer, calls to the member function <SAMP>failed()</SAMP> return <SAMP>true</SAMP>.</P>
	</UL>


	<A NAME="idx1073"></A><PRE><B>ostreambuf_iterator</B>(streambuf_type *s) throw();</PRE>
	<UL>
	<P>Constructs an <B><I>ostreambuf_iterator</I></B> that uses the <B><I><A HREF="basic-streambuf.html">basic_streambuf</A></I></B> object pointed to by <SAMP>s</SAMP> to output characters. If <SAMP>s</SAMP> is a null pointer, calls to the member function<SAMP> failed()</SAMP> return <SAMP>true</SAMP>.</P>
	</UL>

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

	<A NAME="idx1074"></A><PRE>ostreambuf_iterator&
	<B>operator=</B>(char_type c); </PRE>
	<UL>
	<P>Inserts the character <SAMP>c</SAMP> into the output sequence of the attached stream buffer. If the operation fails, calls to the member function <SAMP>failed()</SAMP> return <SAMP>true</SAMP>.</P>
	</UL>


	<A NAME="idx1075"></A><PRE>ostreambuf_iterator&
	<B>operator++</B>();</PRE>
	<UL>
	<P>Returns <SAMP>*this</SAMP>.</P>
	</UL>


	<A NAME="idx1076"></A><PRE>ostreambuf_iterator
	<B>operator++</B>(int); </PRE>
	<UL>
	<P>Returns <SAMP>*this</SAMP>. </P>
	</UL>


	<A NAME="idx1077"></A><PRE>ostreambuf_iterator
	<B>operator*</B>();</PRE>
	<UL>
	<P>Returns <SAMP>*this</SAMP>. </P>
	</UL>

	<A NAME="sec9"><H3>Public Member Functions</H3></A>

	<A NAME="idx1078"></A><PRE>bool
	<B>failed</B>() const
	throw();</PRE>
	<UL>
	<P>Returns <SAMP>true</SAMP> if the iterator failed while inserting a character. Otherwise returns <SAMP>false</SAMP>. </P>
	</UL>

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

	<UL><PRE>//
	// ostreambuf_iterator.cpp
	//

	#include <iostream> // for cout, endl
	#include <iterator> // for istreambuf_iterator,
	// ostreambuf_iterator
	#include <fstream> // for filebuf

	#include <stdio.h> // for tmpnam and remove


	int main ( )
	{
	char namebuf [L_tmpnam];

	// create a temporary filename
	const char *fname = tmpnam (namebuf);

	if (!fname)
	return 1;

	// create a filebuf object
	std::filebuf buf;

	// open the file and link it to the filebuf object
	buf.open (fname, std::ios::in \| std::ios::out \|
	std::ios::trunc);

	// create an ostreambuf_iterator and link it to
	// the filebuf object
	std::ostreambuf_iterator<char, std::char_traits<char> >
	out_iter (&buf);

	// output into the file using the ostreambuf_iterator
	for (char i = 64; i < 127; i++)
	out_iter = i;

	// seek to the beginning of the file
	buf.pubseekpos(0);

	// create an istreambuf_iterator and link it to
	// the filebuf object
	std::istreambuf_iterator<char, std::char_traits<char> >
	in_iter (&buf);

	// construct an end of stream iterator
	std::istreambuf_iterator<char, std::char_traits<char> >
	end;

	std::cout << std::endl;

	// output the contents of the file
	while (!in_iter.equal (end))
	std::cout << *in_iter++;

	std::cout << std::endl;

	// remove temporary file
	remove (fname);

	return 0;
	}


	Program Output:
	</PRE></UL>
	<UL><PRE>
	@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{\|}~
	</PRE></UL>
	<A NAME="sec11"><H3>See Also</H3></A>
	<P><B><I><A HREF="basic-streambuf.html">basic_streambuf</A></I></B>, <B><I><A HREF="basic-ostream.html">basic_ostream</A></I></B>, <B><I><A HREF="istreambuf-iterator.html">istreambuf_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 24.5.4</I></P>

	<BR>
	<HR>
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