doc/stdlibref/istrstream.html - stdcxx - Git at Google

 <HTML>
 <HEAD>
 <TITLE>istrstream</TITLE>
 <LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
 <BODY BGCOLOR=#FFFFFF>
 <A HREF="istreambuf-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="isupper.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>istrstream</H2>
 <P><B>Library:</B>&nbsp;&nbsp;<A HREF="2-11.html">Input/output</A></P>

 <PRE><HR><B><I>istrstream</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">Constructors</A></LI>
 <LI><A HREF="#sec8">Destructors</A></LI>
 <LI><A HREF="#sec9">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="#idx743">char_type</A><BR>
 <A HREF="#idx744">int_type</A><BR>
 <A HREF="#idx748">istrstream()</A><BR>
 </TD>
 <TD VALIGN=top><A HREF="#idx745">off_type</A><BR>
 <A HREF="#idx746">pos_type</A><BR>
 <A HREF="#idx752">rdbuf()</A><BR>
 </TD>
 <TD VALIGN=top><A HREF="#idx751">str()</A><BR>
 <A HREF="#idx747">traits_type</A><BR>
 <A HREF="#idx750">~istrstream()</A><BR>
 </TD>
 <TD VALIGN=top></TD></TR>
 </TABLE></UL>

 <A NAME="sec2"><H3>Summary</H3></A>
 <P>Class that reads characters from an array in memory</P>
 <A NAME="sec3"><H3>Synopsis</H3></A>

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

 namespace std {
   class istrstream;
 }
 </PRE>
 <A NAME="sec4"><H3>Description</H3></A>
 <P>The class <B><I>istrstream</I></B> reads characters from an array in memory. It uses a private <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object to control the associated array object. 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>
 <BLOCKQUOTE><HR><B>
 NOTE -- This is a deprecated feature and might not be available in future versions.
 </B><HR></BLOCKQUOTE>
 <A NAME="sec5"><H3>Interface</H3></A>

 <UL><PRE>namespace std {

   class istrstream : public basic_istream&lt;char&gt; {

     public:

       typedef char                            char_type;
       typedef char_traits&lt;char_type&gt;          traits_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 istrstream(const char *s);
       istrstream(const char *s, streamsize n);
       explicit istrstream(char *s);
       istrstream(char *s, streamsize n);

       virtual ~istrstream();

       strstreambuf *rdbuf() const;
       char *str();

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

 <A NAME="idx743"></A><PRE><B>char_type</B></PRE>
 <UL>
 <P>The type <SAMP>char_type</SAMP> is a synonym of type <SAMP>char</SAMP>.</P>
 </UL>


 <A NAME="idx744"></A><PRE><B>int_type</B></PRE>
 <UL>
 <P>The type <SAMP>int_type</SAMP> is a synonym of type <SAMP>traits_type::in_type</SAMP>.</P>
 </UL>


 <A NAME="idx745"></A><PRE><B>off_type</B></PRE>
 <UL>
 <P>The type <SAMP>off_type</SAMP> is a synonym of type <SAMP>traits_type::off_type</SAMP>.</P>
 </UL>


 <A NAME="idx746"></A><PRE><B>pos_type</B></PRE>
 <UL>
 <P>The type <SAMP>pos_type</SAMP> is a synonym of type <SAMP>traits_type::pos_type</SAMP>.</P>
 </UL>


 <A NAME="idx747"></A><PRE><B>traits_type</B></PRE>
 <UL>
 <P>The type <SAMP>traits_type</SAMP> is a synonym of type <SAMP>char_traits&lt;char&gt;</SAMP>.</P>
 </UL>

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

 <A NAME="idx748"></A><PRE>explicit <B>istrstream</B>(const char* s);
 explicit <B>istrstream</B>(char* s); </PRE>
 <UL>
 <P>Constructs an object of class <B><I>istrstream</I></B>, initializing the base class <B><I><A HREF="basic-istream.html">basic_istream</A></I></B> with the associated <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object. The <B><I>strstreambuf</I></B> object is initialized by calling <SAMP>strstreambuf(s,0)</SAMP>, where <SAMP>s</SAMP> designates the first element of an NTBS (null terminated byte string). </P>
 </UL>


 <A NAME="idx749"></A><PRE>explicit <B>istrstream</B>(const char* s, streamsize n);
 explicit <B>istrstream</B>(char* s, streamsize n); </PRE>
 <UL>
 <P>Constructs an object of class <B><I>istrstream</I></B>, initializing the base class <B><I><A HREF="basic-istream.html">basic_istream</A></I></B> with the associated <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object. The <B><I>strstreambuf</I></B> object is initialized by calling <SAMP>strstreambuf(s,n)</SAMP>, where <SAMP>s</SAMP> designates the first element of an array whose length is <SAMP>n</SAMP> elements and <SAMP>n</SAMP> is greater than zero. </P>
 </UL>

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

 <A NAME="idx750"></A><PRE>virtual <B>~istrstream</B>();</PRE>
 <UL>
 <P>Destroys an object of class <SAMP>istrstream</SAMP>. </P>
 </UL>

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

 <A NAME="idx751"></A><PRE>char*
 <B>str</B>();</PRE>
 <UL>
 <P>Calls <SAMP>rdbuf()-&gt;str()</SAMP>.</P>
 </UL>


 <A NAME="idx752"></A><PRE>strstreambuf*
 <B>rdbuf</B>() const; </PRE>
 <UL>
 <P>Returns a pointer to the private <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object associated with the stream.</P>
 </UL>

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

 <UL><PRE>//
 //  istrstream.cpp
 //

 #include &lt;iostream&gt;    // for cout
 #include &lt;strstream&gt;   // for strstream


 int main ()
 {
     // create two constant istrstream objects and initialize their
     // underlying strstreambufs with string literals; the objects
     // do not create copies of the literals but use them directly
     // for efficiency
     std::istrstream a ("Ce n'est pas l'homme qui prend la mer, ");
     std::istrstream b ("c'est la mer qui prend l'homme.");

     // create a dynamic strstream object
     std::strstream out;

     // output the contents of the streams into out
     out &lt;&lt; a.rdbuf () &lt;&lt; b.str () &lt;&lt; '\n';

     // output the contents of out to standard output
     std::cout &lt;&lt; out.rdbuf () &lt;&lt; '\n';

     // output the contents of the stream objects to standard output
     std::cout &lt;&lt; a.str () &lt;&lt; '\n' &lt;&lt; b.rdbuf () &lt;&lt; '\n';

     // the dtors of a and b will not release any storage
     // since the objects did not allocate any

     // the dtor of out will release allocated storage since
     // neither freeze() nor str() was called on the object

     return 0;
 }


 Program Output:
 </PRE></UL>
 <UL><PRE>Ce n'est pas l'homme qui prend la mer, c'est la mer qui prend l'homme.

 Ce n'est pas l'homme qui prend la mer,
 c'est la mer qui prend l'homme.
 </PRE></UL>
 <A NAME="sec11"><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="strstreambuf.html">strstreambuf</A></I></B>, <B><I><A HREF="ostrstream.html">ostrstream</A></I></B>, <B><I><A HREF="strstream.html">strstream</A></I></B></P>
 <A NAME="sec12"><H3>Standards Conformance</H3></A>
 <P><I>Deprecated.  See ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, </I>Annex D Compatibility features Section D.7.2</P>

 <BR>
 <HR>
 <A HREF="istreambuf-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="isupper.html"><IMG SRC="images/bnext.gif" WIDTH=20 HEIGHT=21 ALT="Next file" BORDER=O></A>

 <!-- Google Analytics tracking code -->
 <script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
 </script>
 <script type="text/javascript">
     _uacct = "UA-1775151-1";
     urchinTracker();
 </script>
 <!-- end of Google Analytics tracking code -->

 </BODY>
 </HTML>
	<HTML>
	<HEAD>
	<TITLE>istrstream</TITLE>
	<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
	<BODY BGCOLOR=#FFFFFF>
	<A HREF="istreambuf-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="isupper.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>istrstream</H2>
	<P><B>Library:</B>  <A HREF="2-11.html">Input/output</A></P>

	<PRE><HR><B><I>istrstream</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">Constructors</A></LI>
	<LI><A HREF="#sec8">Destructors</A></LI>
	<LI><A HREF="#sec9">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="#idx743">char_type</A><BR>
	<A HREF="#idx744">int_type</A><BR>
	<A HREF="#idx748">istrstream()</A><BR>
	</TD>
	<TD VALIGN=top><A HREF="#idx745">off_type</A><BR>
	<A HREF="#idx746">pos_type</A><BR>
	<A HREF="#idx752">rdbuf()</A><BR>
	</TD>
	<TD VALIGN=top><A HREF="#idx751">str()</A><BR>
	<A HREF="#idx747">traits_type</A><BR>
	<A HREF="#idx750">~istrstream()</A><BR>
	</TD>
	<TD VALIGN=top></TD></TR>
	</TABLE></UL>

	<A NAME="sec2"><H3>Summary</H3></A>
	<P>Class that reads characters from an array in memory</P>
	<A NAME="sec3"><H3>Synopsis</H3></A>

	<PRE>#include <strstream>

	namespace std {
	class istrstream;
	}
	</PRE>
	<A NAME="sec4"><H3>Description</H3></A>
	<P>The class <B><I>istrstream</I></B> reads characters from an array in memory. It uses a private <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object to control the associated array object. 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>
	<BLOCKQUOTE><HR><B>
	NOTE -- This is a deprecated feature and might not be available in future versions.
	</B><HR></BLOCKQUOTE>
	<A NAME="sec5"><H3>Interface</H3></A>

	<UL><PRE>namespace std {

	class istrstream : public basic_istream<char> {

	public:

	typedef char char_type;
	typedef char_traits<char_type> traits_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 istrstream(const char *s);
	istrstream(const char *s, streamsize n);
	explicit istrstream(char *s);
	istrstream(char *s, streamsize n);

	virtual ~istrstream();

	strstreambuf *rdbuf() const;
	char *str();

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

	<A NAME="idx743"></A><PRE><B>char_type</B></PRE>
	<UL>
	<P>The type <SAMP>char_type</SAMP> is a synonym of type <SAMP>char</SAMP>.</P>
	</UL>


	<A NAME="idx744"></A><PRE><B>int_type</B></PRE>
	<UL>
	<P>The type <SAMP>int_type</SAMP> is a synonym of type <SAMP>traits_type::in_type</SAMP>.</P>
	</UL>


	<A NAME="idx745"></A><PRE><B>off_type</B></PRE>
	<UL>
	<P>The type <SAMP>off_type</SAMP> is a synonym of type <SAMP>traits_type::off_type</SAMP>.</P>
	</UL>


	<A NAME="idx746"></A><PRE><B>pos_type</B></PRE>
	<UL>
	<P>The type <SAMP>pos_type</SAMP> is a synonym of type <SAMP>traits_type::pos_type</SAMP>.</P>
	</UL>


	<A NAME="idx747"></A><PRE><B>traits_type</B></PRE>
	<UL>
	<P>The type <SAMP>traits_type</SAMP> is a synonym of type <SAMP>char_traits<char></SAMP>.</P>
	</UL>

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

	<A NAME="idx748"></A><PRE>explicit <B>istrstream</B>(const char* s);
	explicit <B>istrstream</B>(char* s); </PRE>
	<UL>
	<P>Constructs an object of class <B><I>istrstream</I></B>, initializing the base class <B><I><A HREF="basic-istream.html">basic_istream</A></I></B> with the associated <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object. The <B><I>strstreambuf</I></B> object is initialized by calling <SAMP>strstreambuf(s,0)</SAMP>, where <SAMP>s</SAMP> designates the first element of an NTBS (null terminated byte string). </P>
	</UL>


	<A NAME="idx749"></A><PRE>explicit <B>istrstream</B>(const char* s, streamsize n);
	explicit <B>istrstream</B>(char* s, streamsize n); </PRE>
	<UL>
	<P>Constructs an object of class <B><I>istrstream</I></B>, initializing the base class <B><I><A HREF="basic-istream.html">basic_istream</A></I></B> with the associated <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object. The <B><I>strstreambuf</I></B> object is initialized by calling <SAMP>strstreambuf(s,n)</SAMP>, where <SAMP>s</SAMP> designates the first element of an array whose length is <SAMP>n</SAMP> elements and <SAMP>n</SAMP> is greater than zero. </P>
	</UL>

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

	<A NAME="idx750"></A><PRE>virtual <B>~istrstream</B>();</PRE>
	<UL>
	<P>Destroys an object of class <SAMP>istrstream</SAMP>. </P>
	</UL>

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

	<A NAME="idx751"></A><PRE>char*
	<B>str</B>();</PRE>
	<UL>
	<P>Calls <SAMP>rdbuf()->str()</SAMP>.</P>
	</UL>


	<A NAME="idx752"></A><PRE>strstreambuf*
	<B>rdbuf</B>() const; </PRE>
	<UL>
	<P>Returns a pointer to the private <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object associated with the stream.</P>
	</UL>

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

	<UL><PRE>//
	// istrstream.cpp
	//

	#include <iostream> // for cout
	#include <strstream> // for strstream



	int main ()
	{
	// create two constant istrstream objects and initialize their
	// underlying strstreambufs with string literals; the objects
	// do not create copies of the literals but use them directly
	// for efficiency
	std::istrstream a ("Ce n'est pas l'homme qui prend la mer, ");
	std::istrstream b ("c'est la mer qui prend l'homme.");

	// create a dynamic strstream object
	std::strstream out;

	// output the contents of the streams into out
	out << a.rdbuf () << b.str () << '\n';

	// output the contents of out to standard output
	std::cout << out.rdbuf () << '\n';

	// output the contents of the stream objects to standard output
	std::cout << a.str () << '\n' << b.rdbuf () << '\n';

	// the dtors of a and b will not release any storage
	// since the objects did not allocate any

	// the dtor of out will release allocated storage since
	// neither freeze() nor str() was called on the object

	return 0;
	}


	Program Output:
	</PRE></UL>
	<UL><PRE>Ce n'est pas l'homme qui prend la mer, c'est la mer qui prend l'homme.

	Ce n'est pas l'homme qui prend la mer,
	c'est la mer qui prend l'homme.
	</PRE></UL>
	<A NAME="sec11"><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="strstreambuf.html">strstreambuf</A></I></B>, <B><I><A HREF="ostrstream.html">ostrstream</A></I></B>, <B><I><A HREF="strstream.html">strstream</A></I></B></P>
	<A NAME="sec12"><H3>Standards Conformance</H3></A>
	<P><I>Deprecated. See ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, </I>Annex D Compatibility features Section D.7.2</P>

	<BR>
	<HR>
	<A HREF="istreambuf-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="isupper.html"><IMG SRC="images/bnext.gif" WIDTH=20 HEIGHT=21 ALT="Next file" BORDER=O></A>

	<!-- Google Analytics tracking code -->
	<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
	</script>
	<script type="text/javascript">
	_uacct = "UA-1775151-1";
	urchinTracker();
	</script>
	<!-- end of Google Analytics tracking code -->

	</BODY>
	</HTML>