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<HTML>
<HEAD>
<TITLE>basic_istringstream</TITLE>
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<A HREF="basic-istream.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="basic-ofstream.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>basic_istringstream</H2>
<P><B>Library:</B>&nbsp;&nbsp;<A HREF="2-11.html">Input/output</A></P>
<PRE><HR><B><I>basic_istringstream</I></B> <IMG SRC="images/inherits.gif"> <B><I><A HREF="basic-istream.html">basic_istream</A></I></B> <IMG SRC="images/inherits.gif"> <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> <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">Nonmember Types</A></LI>
<LI><A HREF="#sec8">Constructors</A></LI>
<LI><A HREF="#sec9">Destructor</A></LI>
<LI><A HREF="#sec10">Member Functions</A></LI>
<LI><A HREF="#sec11">Example</A></LI>
<LI><A HREF="#sec12">See Also</A></LI>
<LI><A HREF="#sec13">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="#idx188">allocator_type</A><BR>
<A HREF="#idx196">basic_istringstream()</A><BR>
<A HREF="#idx189">char_type</A><BR>
</TD>
<TD VALIGN=top><A HREF="#idx190">int_type</A><BR>
<A HREF="#idx191">off_type</A><BR>
<A HREF="#idx192">pos_type</A><BR>
</TD>
<TD VALIGN=top><A HREF="#idx199">rdbuf()</A><BR>
<A HREF="#idx200">str()</A><BR>
<A HREF="#idx193">traits_type</A><BR>
</TD>
<TD VALIGN=top><A HREF="#idx198">~basic_istringstream()</A><BR>
</TD></TR>
</TABLE></UL>
<H4>Non-Members</H4>
<UL><TABLE CELLPADDING=3>
<TR><TD VALIGN=top>
<A HREF="#idx194">istringstream</A><BR>
</TD>
<TD VALIGN=top><A HREF="#idx195">wistringstream</A><BR>
</TD>
<TD VALIGN=top></TD></TR>
</TABLE></UL>
<A NAME="sec2"><H3>Summary</H3></A>
<P>Class that supports reading objects of specializations of class template <B><I><A HREF="basic-string.html">basic_string</A></I></B> from an array in memory</P>
<A NAME="sec3"><H3>Synopsis</H3></A>
<PRE>#include &lt;sstream&gt;
namespace std {
template&lt;class charT, class traits = char_traits&lt;charT&gt;,
class Allocator = allocator&lt;charT&gt; &gt;
class basic_istringstream;
}
</PRE>
<A NAME="sec4"><H3>Description</H3></A>
<P>The class template <B><I>basic_istringstream</I></B> reads from an array in memory. It supports 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-istream.html">basic_istream</A></I></B>, and therefore can use all the formatted and unformatted input functions.</P>
<A NAME="sec5"><H3>Interface</H3></A>
<UL><PRE>namespace std {
template&lt;class charT, class traits = char_traits&lt;charT&gt;,
class Allocator = allocator&lt;void&gt; &gt;
class basic_istringstream
: public basic_istream&lt;charT, traits&gt;
{
public:
typedef traits traits_type;
typedef charT char_type;
typedef Allocator allocator_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
explicit
basic_istringstream(ios_base::openmode = ios_base::in);
explicit
basic_istringstream(const basic_string&lt;char_type,
traits_type,
allocator_type&gt;&amp;,
ios_base::openmode = ios_base::in);
virtual ~basic_istringstream();
basic_stringbuf&lt;char_type, traits_type, allocator_type&gt; *
rdbuf() const;
basic_string&lt;char_type, traits_type, allocator_type&gt;
str() const;
void
str(const basic_string&lt;char_type, traits_type,
allocator_type&gt;&amp;);
};
}
</PRE></UL>
<A NAME="sec6"><H3>Member Types</H3></A>
<A NAME="idx188"></A><PRE><B>allocator_type</B></PRE>
<UL>
<P>The type <SAMP>allocator_type</SAMP> is a synonym for the template parameter <SAMP>Allocator</SAMP>.</P>
</UL>
<A NAME="idx189"></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="idx190"></A><PRE><B>int_type</B></PRE>
<UL>
<P>The type <SAMP>int_type</SAMP> is a synonym of type <SAMP>traits::in_type</SAMP>.</P>
</UL>
<A NAME="idx191"></A><PRE><B>off_type</B></PRE>
<UL>
<P>The type <SAMP>off_type</SAMP> is a synonym of type <SAMP>traits::off_type</SAMP>.</P>
</UL>
<A NAME="idx192"></A><PRE><B>pos_type</B></PRE>
<UL>
<P>The type <SAMP>pos_type</SAMP> is a synonym of type <SAMP>traits::pos_type</SAMP>.</P>
</UL>
<A NAME="idx193"></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>Nonmember Types</H3></A>
<A NAME="idx194"></A><PRE><B>istringstream</B></PRE>
<UL>
<P>The type <SAMP>istringstream</SAMP> is an instantiation of class <B><I>basic_istringstream</I></B> on type <SAMP>char</SAMP>:</P>
<P><SAMP>typedef basic_istringstream&lt;char&gt; istringstream;</SAMP></P>
</UL>
<A NAME="idx195"></A><PRE><B>wistringstream</B></PRE>
<UL>
<P>The type <SAMP>wistringstream</SAMP> is an instantiation of class <B><I>basic_istringstream</I></B> on type <SAMP>wchar_t</SAMP>:</P>
<P><SAMP>typedef basic_istringstream&lt;wchar_t&gt; wistringstream;</SAMP></P>
</UL>
<A NAME="sec8"><H3>Constructors</H3></A>
<A NAME="idx196"></A><PRE>explicit
<B>basic_istringstream</B>(ios_base::openmode which = ios_base::in);</PRE>
<UL>
<P>Constructs an object of class <B><I>basic_istringstream</I></B>, initializing the base class <B><I><A HREF="basic-istream.html">basic_istream</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:</P>
<P> <SAMP>basic_stringbuf&lt;char_type,traits_type,<br> allocator_type&gt;(which)</SAMP></P>
</UL>
<A NAME="idx197"></A><PRE>explicit
<B>basic_istringstream</B>(const basic_string&lt;char_type, traits_type,
allocator_type&gt;&amp; str,
ios_base::openmode which = ios_base::in); </PRE>
<UL>
<P>Constructs an object of class <B><I>basic_istringstream</I></B>, initializing the base class <B><I><A HREF="basic-istream.html">basic_istream</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:</P>
<P> <SAMP>basic_stringbuf&lt;char_type, traits_type,<br> allocator_type&gt;(str,which)</SAMP></P>
</UL>
<A NAME="sec9"><H3>Destructor</H3></A>
<A NAME="idx198"></A><PRE>virtual <B>~basic_istringstream</B>();</PRE>
<UL>
<P>Destroys an object of class <B><I>basic_istringstream</I></B>.</P>
</UL>
<A NAME="sec10"><H3>Member Functions</H3></A>
<A NAME="idx199"></A><PRE>basic_stringbuf&lt;char_type, traits_type, allocator_type&gt;*
<B>rdbuf</B>() const; </PRE>
<UL>
<P>Returns a pointer to the <B><I><A HREF="basic-stringbuf.html">basic_stringbuf</A></I></B> associated with the stream.</P>
</UL>
<A NAME="idx200"></A><PRE>basic_string&lt;char_type, traits_type, allocator_type&gt;
<B>str</B>() const; </PRE>
<UL>
<P>Returns <SAMP>rdbuf()-&gt;str()</SAMP>.</P>
</UL>
<A NAME="idx201"></A><PRE>void
<B>str</B>(const basic_string&lt;char_type, traits_type,
allocator_type&gt;&amp; str); </PRE>
<UL>
<P>Calls <SAMP>rdbuf()-&gt;str(str)</SAMP>. </P>
</UL>
<A NAME="sec11"><H3>Example</H3></A>
<UL><PRE>//
// istringstream.cpp
//
#include &lt;iomanip&gt; // for setw
#include &lt;iostream&gt; // for wcout, dec, endl, hex, oct, wostream
#include &lt;sstream&gt; // for strstream, wistringstream
#include &lt;string&gt; // for wstring
int main ( )
{
try {
// create a read/write stream object
std::wistringstream in (std::ios::in | std::ios::out);
// associate the ostream object's buffer with
// the ifstream object
std::wostream out (in.rdbuf ());
// enable exceptions in both streams
in.exceptions (std::ios::badbit);
out.exceptions (std::ios::failbit | std::ios::badbit);
// write string into out
out &lt;&lt; "Il avait l'air heureux." &lt;&lt; std::endl;
// seek to the beginning of the stream
in.seekg (0);
wchar_t c;
// output each space-separated word on a separate line
while (in.get (c)) {
if (std::isspace (c, in.getloc ()))
std::wcout &lt;&lt; std::endl;
else
std::wcout &lt;&lt; c;
}
std::wcout &lt;&lt; std::endl;
// clear stream state, failbit | eofbit set by
// last call to get ()
in.clear ();
// move back to the beginning of the stream
in.seekg (0);
wchar_t buf [40];
// guard against buffer overflow
in.width (sizeof buf);
// set right justification
std::wcout &lt;&lt; std::right;
// does the same thing as the previous code
// output each word on a separate line
// in a field of width 10
while (in &gt;&gt; buf) {
std::wcout.width (10);
std::wcout &lt;&lt; buf &lt;&lt; std::endl;
}
std::wcout &lt;&lt; std::endl;
// clear flags, last in &gt;&gt; buf set fail bit
// because of a newline at end of string
in.clear ();
// output the base info before each integer
out &lt;&lt; std::showbase;
std::wostream::pos_type pos= out.tellp ();
const long l = 10;
// output l in hex with a field with of 10
out &lt;&lt; std::hex &lt;&lt; std::setw (10) &lt;&lt; l &lt;&lt; std::endl;
// output l in oct with a field with of 10
out &lt;&lt; std::oct &lt;&lt; std::setw (10) &lt;&lt; l &lt;&lt; std::endl;
// output l in dec with a field with of 10
out &lt;&lt; std::dec &lt;&lt; std::setw (10) &lt;&lt; l &lt;&lt; std::endl;
// move back to the beginning of the stream
in.seekg (0);
// output the entire stream
std::wcout &lt;&lt; in.rdbuf () &lt;&lt; std::endl;
// clear the flags
in.clear ();
// seek the input sequence to pos
in.seekg (pos);
in.unsetf (std::ios::basefield);
int a, b, d;
// read the previous outputted integer
in &gt;&gt; a &gt;&gt; b &gt;&gt; d;
// output 3 times 10
std::wcout &lt;&lt; a &lt;&lt; std::endl &lt;&lt; b &lt;&lt; std::endl
&lt;&lt; d &lt;&lt; std::endl;
}
catch (std::ios::failure &amp;e) {
std::wcerr &lt;&lt; e.what () &lt;&lt; std::endl;
}
return 0;
}
Program Output:
</PRE></UL>
<UL><PRE>4848525670694967
0048FE1C
0048FE1C
0xa
012
10
10
10
10
</PRE></UL>
<A NAME="sec12"><H3>See Also</H3></A>
<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-ostringstream.html">basic_ostringstream</A></I></B>, <B><I><A HREF="basic-stringstream.html">basic_stringstream</A></I></B></P>
<A NAME="sec13"><H3>Standards Conformance</H3></A>
<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 27.7.2</I></P>
<BR>
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