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extern/stdcxx/4.2.1/doc/stdlibref/ostreambuf-iterator.html
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extern/stdcxx/4.2.1/doc/stdlibref/ostreambuf-iterator.html
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<HTML>
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<HEAD>
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<TITLE>ostreambuf_iterator</TITLE>
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<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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<BODY BGCOLOR=#FFFFFF>
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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>
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<H2>ostreambuf_iterator</H2>
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<P><B>Library:</B> <A HREF="2-8.html">Iterators</A></P>
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<PRE><HR><B><I>ostreambuf_iterator</I></B> <IMG SRC="images/inherits.gif"> <B><I>output_iterator</I></B><HR></PRE>
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<UL>
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<LI><A HREF="#sec1">Local Index</A></LI>
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<LI><A HREF="#sec2">Summary</A></LI>
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<LI><A HREF="#sec3">Synopsis</A></LI>
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<LI><A HREF="#sec4">Description</A></LI>
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<LI><A HREF="#sec5">Interface</A></LI>
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<LI><A HREF="#sec6">Member Types</A></LI>
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<LI><A HREF="#sec7">Constructors</A></LI>
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<LI><A HREF="#sec8">Member Operators</A></LI>
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<LI><A HREF="#sec9">Public Member Functions</A></LI>
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<LI><A HREF="#sec10">Example</A></LI>
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<LI><A HREF="#sec11">See Also</A></LI>
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<LI><A HREF="#sec12">Standards Conformance</A></LI>
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</UL>
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<A NAME="sec1"><H3>Local Index</H3></A>
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<H4>Members</H4>
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<UL><TABLE CELLPADDING=3>
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<TR><TD VALIGN=top>
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<A HREF="#idx1068">char_type</A><BR>
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<A HREF="#idx1078">failed()</A><BR>
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<A HREF="#idx1077">operator*()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx1075">operator++()</A><BR>
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<A HREF="#idx1074">operator=()</A><BR>
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<A HREF="#idx1072">ostreambuf_iterator()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx1069">ostream_type</A><BR>
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<A HREF="#idx1070">streambuf_type</A><BR>
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<A HREF="#idx1071">traits_type</A><BR>
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</TD>
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<TD VALIGN=top></TD></TR>
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</TABLE></UL>
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<A NAME="sec2"><H3>Summary</H3></A>
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<P>Writes successive characters onto the stream buffer object from which it was constructed</P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <iterator>
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namespace std {
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template<class charT, class traits = char_traits<charT> >
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class ostreambuf_iterator;
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}
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</PRE>
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<A NAME="sec4"><H3>Description</H3></A>
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<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>
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<A NAME="sec5"><H3>Interface</H3></A>
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<UL><PRE>namespace std {
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template<class charT, class traits = char_traits<charT> >
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class ostreambuf_iterator
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: public iterator <output_iterator_tag, void,
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void, void, void>
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{
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public:
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typedef charT char_type;
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typedef traits traits_type;
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typedef basic_streambuf<charT, traits> streambuf_type;
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typedef basic_ostream<charT, traits> ostream_type;
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ostreambuf_iterator(ostream_type& s) throw();
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ostreambuf_iterator(streambuf_type *s) throw();
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ostreambuf_iterator& operator=(char_type c);
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ostreambuf_iterator& operator*();
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ostreambuf_iterator& operator++();
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ostreambuf_iterator operator++(int);
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bool failed( ) const throw();
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};
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}
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</PRE></UL>
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<A NAME="sec6"><H3>Member Types</H3></A>
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<A NAME="idx1068"></A><PRE><B>char_type</B></PRE>
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<UL>
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<P>The type <SAMP>char_type</SAMP> is a synonym for the template parameter <SAMP>charT</SAMP>.</P>
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</UL>
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<A NAME="idx1069"></A><PRE><B>ostream_type</B></PRE>
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<UL>
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<P>The type <SAMP>ostream_type</SAMP> is a synonym for the type <SAMP>basic_ostream<char_type, traits_type></SAMP>.</P>
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</UL>
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<A NAME="idx1070"></A><PRE><B>streambuf_type</B></PRE>
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<UL>
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<P>The type <SAMP>streambuf_type</SAMP> is a synonym for the type <SAMP>basic_streambuf<char_type, traits_type></SAMP>.</P>
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</UL>
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<A NAME="idx1071"></A><PRE><B>traits_type</B></PRE>
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<UL>
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<P>The type <SAMP>traits_type</SAMP> is a synonym for the template parameter <SAMP>traits</SAMP>.</P>
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</UL>
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<A NAME="sec7"><H3>Constructors</H3></A>
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<A NAME="idx1072"></A><PRE><B>ostreambuf_iterator</B>(ostream_type& s) throw();</PRE>
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<UL>
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<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>
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</UL>
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<A NAME="idx1073"></A><PRE><B>ostreambuf_iterator</B>(streambuf_type *s) throw();</PRE>
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<UL>
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<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>
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</UL>
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<A NAME="sec8"><H3>Member Operators</H3></A>
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<A NAME="idx1074"></A><PRE>ostreambuf_iterator&
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<B>operator=</B>(char_type c); </PRE>
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<UL>
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<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>
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</UL>
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<A NAME="idx1075"></A><PRE>ostreambuf_iterator&
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<B>operator++</B>();</PRE>
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<UL>
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<P>Returns <SAMP>*this</SAMP>.</P>
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</UL>
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<A NAME="idx1076"></A><PRE>ostreambuf_iterator
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<B>operator++</B>(int); </PRE>
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<UL>
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<P>Returns <SAMP>*this</SAMP>. </P>
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</UL>
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<A NAME="idx1077"></A><PRE>ostreambuf_iterator
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<B>operator*</B>();</PRE>
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<UL>
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<P>Returns <SAMP>*this</SAMP>. </P>
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</UL>
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<A NAME="sec9"><H3>Public Member Functions</H3></A>
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<A NAME="idx1078"></A><PRE>bool
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<B>failed</B>() const
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throw();</PRE>
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<UL>
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<P>Returns <SAMP>true</SAMP> if the iterator failed while inserting a character. Otherwise returns <SAMP>false</SAMP>. </P>
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</UL>
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<A NAME="sec10"><H3>Example</H3></A>
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<UL><PRE>//
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// ostreambuf_iterator.cpp
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//
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#include <iostream> // for cout, endl
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#include <iterator> // for istreambuf_iterator,
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// ostreambuf_iterator
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#include <fstream> // for filebuf
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#include <stdio.h> // for tmpnam and remove
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int main ( )
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{
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char namebuf [L_tmpnam];
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// create a temporary filename
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const char *fname = tmpnam (namebuf);
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if (!fname)
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return 1;
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// create a filebuf object
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std::filebuf buf;
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// open the file and link it to the filebuf object
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buf.open (fname, std::ios::in | std::ios::out |
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std::ios::trunc);
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// create an ostreambuf_iterator and link it to
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// the filebuf object
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std::ostreambuf_iterator<char, std::char_traits<char> >
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out_iter (&buf);
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// output into the file using the ostreambuf_iterator
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for (char i = 64; i < 127; i++)
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out_iter = i;
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// seek to the beginning of the file
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buf.pubseekpos(0);
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// create an istreambuf_iterator and link it to
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// the filebuf object
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std::istreambuf_iterator<char, std::char_traits<char> >
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in_iter (&buf);
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// construct an end of stream iterator
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std::istreambuf_iterator<char, std::char_traits<char> >
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end;
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std::cout << std::endl;
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// output the contents of the file
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while (!in_iter.equal (end))
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std::cout << *in_iter++;
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std::cout << std::endl;
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// remove temporary file
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remove (fname);
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return 0;
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}
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Program Output:
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</PRE></UL>
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<UL><PRE>
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@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
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</PRE></UL>
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<A NAME="sec11"><H3>See Also</H3></A>
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<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>
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<A NAME="sec12"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 24.5.4</I></P>
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<BR>
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<HR>
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