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317 lines
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<HEAD>
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<TITLE>basic_stringstream</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="basic-stringbuf.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="bidirectionaliterators.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>basic_stringstream</H2>
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<P><B>Library:</B> <A HREF="2-11.html">Input/output</A></P>
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<PRE><HR> <IMG SRC="images/inherits.gif"><B><I><A HREF="basic-ostream.html">basic_ostream</A></I></B><IMG SRC="images/inherits.gif">
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<B><I>basic_stringstream</I></B><IMG SRC="images/inherits.gif"><B><I><A HREF="basic-iostream.html">basic_iostream</A></I></B> <B><I><A HREF="basic-ios.html">basic_ios</A></I></B><IMG SRC="images/inherits.gif"><B><I><A HREF="ios-base.html">ios_base</A></I></B>
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<IMG SRC="images/inherits.gif"><B><I><A HREF="basic-istream.html">basic_istream</A></I></B><IMG SRC="images/inherits.gif"><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">Nonmember Types</A></LI>
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<LI><A HREF="#sec8">Constructors</A></LI>
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<LI><A HREF="#sec9">Destructor</A></LI>
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<LI><A HREF="#sec10">Member Functions</A></LI>
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<LI><A HREF="#sec11">Example</A></LI>
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<LI><A HREF="#sec12">See Also</A></LI>
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<LI><A HREF="#sec13">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="#idx409">allocator_type</A><BR>
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<A HREF="#idx418">basic_stringstream()</A><BR>
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<A HREF="#idx410">char_type</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx411">int_type</A><BR>
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<A HREF="#idx412">off_type</A><BR>
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<A HREF="#idx413">pos_type</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx421">rdbuf()</A><BR>
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<A HREF="#idx422">str()</A><BR>
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<A HREF="#idx414">string_type</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx415">traits_type</A><BR>
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<A HREF="#idx420">~basic_stringstream()</A><BR>
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</TD></TR>
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</TABLE></UL>
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<H4>Non-Members</H4>
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<UL><TABLE CELLPADDING=3>
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<TR><TD VALIGN=top>
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<A HREF="#idx416">stringstream</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx417">wstringstream</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>Class that supports writing and reading objects of specializations of the class template <B><I><A HREF="basic-string.html">basic_string</A></I></B> to and from an array in memory</P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <sstream>
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namespace std {
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template<class charT, class traits = char_traits<charT>,
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class Allocator = allocator<charT> >
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class basic_stringstream;
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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>basic_stringstream</I></B> reads and writes to an array in memory. It supports writing and reading objects of class <B><I><A HREF="basic-string.html">basic_string</A></I></B>, and uses a <B><I><A HREF="basic-stringbuf.html">basic_stringbuf</A></I></B> object to control the associated storage. It inherits from <B><I><A HREF="basic-iostream.html">basic_iostream</A></I></B> and therefore can use all the formatted and unformatted output and input functions.</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 Allocator = allocator<charT> >
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class basic_stringstream
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: public basic_iostream<charT, traits> {
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public:
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typedef traits traits_type;
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typedef charT char_type;
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typedef Allocator allocator_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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explicit
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basic_stringstream(ios_base::openmode =
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ios_base::out | ios_base::in);
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explicit
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basic_stringstream(const basic_string<char_type,
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traits_type, allocator_type>&,
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ios_base::openmode =
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ios_base::out | ios_base::in);
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virtual ~basic_stringstream();
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basic_stringbuf<char_type, traits_type, allocator_type> *
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rdbuf() const;
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basic_string<char_type, traits_type, allocator_type>
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str() const;
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void
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str(const basic_string<char_type, traits_type, allocator_type>&);
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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="idx409"></A><PRE><B>allocator_type </B></PRE>
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<UL>
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<P>The type <SAMP>allocator_type</SAMP> is a synonym for the template parameter <SAMP>Allocator</SAMP>.</P>
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</UL>
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<A NAME="idx410"></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="idx411"></A><PRE><B>int_type</B></PRE>
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<UL>
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<P>The type <SAMP>int_type</SAMP> is a synonym of type <SAMP>traits::in_type</SAMP>.</P>
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</UL>
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<A NAME="idx412"></A><PRE><B>off_type</B></PRE>
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<UL>
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<P>The type<SAMP> off_type</SAMP> is a synonym of type<SAMP> traits::off_type</SAMP>.</P>
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</UL>
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<A NAME="idx413"></A><PRE><B>pos_type</B></PRE>
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<UL>
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<P>The type <SAMP>pos_type</SAMP> is a synonym of type <SAMP>traits::pos_type</SAMP>.</P>
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</UL>
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<A NAME="idx414"></A><PRE><B>string_type</B></PRE>
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<UL>
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<P>The type <SAMP>string_type</SAMP> is an instantiation of class <B><I><A HREF="basic-string.html">basic_string</A></I></B> on type <SAMP>charT</SAMP>.</P>
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</UL>
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<A NAME="idx415"></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>Nonmember Types</H3></A>
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<A NAME="idx416"></A><PRE><B>stringstream</B></PRE>
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<UL>
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<P>The type <SAMP>stringstream</SAMP> is a specialization of class template <B><I>basic_stringstream</I></B> on type <SAMP>char</SAMP>:</P>
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<P><SAMP>typedef basic_stringstream<char> stringstream;</SAMP></P>
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</UL>
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<A NAME="idx417"></A><PRE><B>wstringstream</B></PRE>
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<UL>
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<P>The type <SAMP>wstringstream</SAMP> is a specialization of class template <B><I>basic_stringstream</I></B> on type <SAMP>wchar_t:</SAMP></P>
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<P><SAMP>typedef basic_stringstream<wchar_t> wstringstream;</SAMP></P>
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</UL>
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<A NAME="sec8"><H3>Constructors</H3></A>
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<A NAME="idx418"></A><PRE>explicit <B>basic_stringstream</B>(ios_base::openmode which =
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ios_base::in | ios_base::out); </PRE>
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<UL>
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<P>Constructs an object of class <B><I>basic_stringstream</I></B>, initializing the base class <B><I><A HREF="basic-iostream.html">basic_iostream</A></I></B> with the associated string buffer. This string buffer is initialized by calling the <B><I><A HREF="basic-stringbuf.html">basic_stringbuf</A></I></B> constructor <SAMP>basic_stringbuf<charT,traits,Allocator>(which)</SAMP>.</P>
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</UL>
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<A NAME="idx419"></A><PRE>explicit <B>basic_stringstream</B>(const basic_string<char_type,
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traits_type, allocator_type>& str,
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ios_base::openmode which =
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ios_base::in | ios_base::out); </PRE>
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<UL>
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<P>Constructs an object of class <B><I>basic_stringstream</I></B>, initializing the base class <B><I><A HREF="basic-iostream.html">basic_iostream</A></I></B> with the associated string buffer. The string buffer is initialized by calling the <B><I><A HREF="basic-stringbuf.html">basic_stringbuf</A></I></B> constructor <SAMP>basic_stringbuf<char_type, traits_type, allocator_type>(str,which)</SAMP>.</P>
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</UL>
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<A NAME="sec9"><H3>Destructor</H3></A>
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<A NAME="idx420"></A><PRE>virtual <B>~basic_stringstream</B>();</PRE>
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<UL>
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<P>Destroys an object of class <B><I>basic_stringstream</I></B>.</P>
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</UL>
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<A NAME="sec10"><H3>Member Functions</H3></A>
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<A NAME="idx421"></A><PRE>basic_stringbuf<char_type, traits_type, allocator_type>*
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<B>rdbuf</B>() const; </PRE>
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<UL>
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<P>Returns a pointer to the <B><I><A HREF="basic-stringbuf.html">basic_stringbuf</A></I></B> associated with the stream.</P>
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</UL>
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<A NAME="idx422"></A><PRE>basic_string<char_type, traits_type, allocator_type>
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<B>str</B>() const; </PRE>
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<UL>
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<P>Returns <SAMP>rdbuf()->str()</SAMP>.</P>
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</UL>
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<A NAME="idx423"></A><PRE>void
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<B>str</B>(const basic_string<char_type, traits_type,
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allocator_type>& str); </PRE>
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<UL>
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<P>Calls <SAMP>rdbuf()->str(str)</SAMP>.</P>
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</UL>
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<A NAME="sec11"><H3>Example</H3></A>
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<UL><PRE>//
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// stringstream.cpp
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//
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#include <iostream> // for wcout, endl
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#include <sstream> // for wstringstream
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int main ()
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{
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// create a bi-directional wstringstream object
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std::wstringstream inout;
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// write out three lines to the stream
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inout << "Dieses ist die Geschichte eines Mannes.\n"
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<< "C'est l'histoire d'un homme.\n"
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<< "This is the story of a man." << std::endl;
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std::wstring line;
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// extract the first line
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std::getline (inout, line);
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// output the first line to stdout
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std::wcout << "\nDeutsch:\n" << line;
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// extract the second line
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std::getline (inout, line);
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// output the second line to stdout
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std::wcout << "\nFrançais:\n" << line;
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// extract the third line
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std::getline (inout, line);
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// output the third line to stdout
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std::wcout << "\nEnglish:\n" << line << std::endl;
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// output the contents of the stream object to stdout
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std::wcout << std::endl << inout.str() << std::endl;
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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></PRE></UL>
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<UL><PRE>Deutsch:
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Dieses ist die Geschichte eines Mannes.
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Français:
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C'est l'histoire d'un homme.
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English:
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This is the story of a man.
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Dieses ist die Geschichte eines Mannes.
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C'est l'histoire d'un homme.
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This is the story of a man.
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</PRE></UL>
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<A NAME="sec12"><H3>See Also</H3></A>
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<P><B><I><A HREF="char-traits.html">char_traits</A></I></B>, <B><I><A HREF="ios-base.html">ios_base</A></I></B>, <B><I><A HREF="basic-ios.html">basic_ios</A></I></B>, <B><I><A HREF="basic-stringbuf.html">basic_stringbuf</A></I></B>, <B><I><A HREF="basic-string.html">basic_string</A></I></B>, <B><I><A HREF="basic-istringstream.html">basic_istringstream</A></I></B>, <B><I><A HREF="basic-ostringstream.html">basic_ostringstream</A></I></B></P>
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<A NAME="sec13"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 27.7.4</I></P>
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<BR>
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