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extern/stdcxx/4.2.1/doc/stdlibref/istrstream.html
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extern/stdcxx/4.2.1/doc/stdlibref/istrstream.html
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<HTML>
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<HEAD>
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<TITLE>istrstream</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="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>
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<H2>istrstream</H2>
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<P><B>Library:</B> <A HREF="2-11.html">Input/output</A></P>
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<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>
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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">Destructors</A></LI>
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<LI><A HREF="#sec9">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="#idx743">char_type</A><BR>
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<A HREF="#idx744">int_type</A><BR>
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<A HREF="#idx748">istrstream()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx745">off_type</A><BR>
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<A HREF="#idx746">pos_type</A><BR>
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<A HREF="#idx752">rdbuf()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx751">str()</A><BR>
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<A HREF="#idx747">traits_type</A><BR>
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<A HREF="#idx750">~istrstream()</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 reads characters from an array in memory</P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <strstream>
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namespace std {
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class istrstream;
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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 <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>
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<BLOCKQUOTE><HR><B>
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NOTE -- This is a deprecated feature and might not be available in future versions.
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</B><HR></BLOCKQUOTE>
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<A NAME="sec5"><H3>Interface</H3></A>
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<UL><PRE>namespace std {
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class istrstream : public basic_istream<char> {
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public:
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typedef char char_type;
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typedef char_traits<char_type> traits_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 istrstream(const char *s);
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istrstream(const char *s, streamsize n);
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explicit istrstream(char *s);
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istrstream(char *s, streamsize n);
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virtual ~istrstream();
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strstreambuf *rdbuf() const;
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char *str();
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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="idx743"></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 of type <SAMP>char</SAMP>.</P>
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</UL>
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<A NAME="idx744"></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_type::in_type</SAMP>.</P>
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</UL>
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<A NAME="idx745"></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_type::off_type</SAMP>.</P>
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</UL>
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<A NAME="idx746"></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_type::pos_type</SAMP>.</P>
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</UL>
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<A NAME="idx747"></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 of type <SAMP>char_traits<char></SAMP>.</P>
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</UL>
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<A NAME="sec7"><H3>Constructors</H3></A>
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<A NAME="idx748"></A><PRE>explicit <B>istrstream</B>(const char* s);
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explicit <B>istrstream</B>(char* s); </PRE>
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<UL>
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<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>
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</UL>
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<A NAME="idx749"></A><PRE>explicit <B>istrstream</B>(const char* s, streamsize n);
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explicit <B>istrstream</B>(char* s, streamsize n); </PRE>
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<UL>
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<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>
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</UL>
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<A NAME="sec8"><H3>Destructors</H3></A>
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<A NAME="idx750"></A><PRE>virtual <B>~istrstream</B>();</PRE>
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<UL>
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<P>Destroys an object of class <SAMP>istrstream</SAMP>. </P>
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</UL>
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<A NAME="sec9"><H3>Member Functions</H3></A>
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<A NAME="idx751"></A><PRE>char*
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<B>str</B>();</PRE>
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<UL>
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<P>Calls <SAMP>rdbuf()->str()</SAMP>.</P>
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</UL>
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<A NAME="idx752"></A><PRE>strstreambuf*
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<B>rdbuf</B>() const; </PRE>
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<UL>
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<P>Returns a pointer to the private <B><I><A HREF="strstreambuf.html">strstreambuf</A></I></B> object associated with the stream.</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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// istrstream.cpp
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//
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#include <iostream> // for cout
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#include <strstream> // for strstream
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int main ()
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{
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// create two constant istrstream objects and initialize their
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// underlying strstreambufs with string literals; the objects
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// do not create copies of the literals but use them directly
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// for efficiency
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std::istrstream a ("Ce n'est pas l'homme qui prend la mer, ");
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std::istrstream b ("c'est la mer qui prend l'homme.");
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// create a dynamic strstream object
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std::strstream out;
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// output the contents of the streams into out
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out << a.rdbuf () << b.str () << '\n';
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// output the contents of out to standard output
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std::cout << out.rdbuf () << '\n';
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// output the contents of the stream objects to standard output
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std::cout << a.str () << '\n' << b.rdbuf () << '\n';
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// the dtors of a and b will not release any storage
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// since the objects did not allocate any
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// the dtor of out will release allocated storage since
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// neither freeze() nor str() was called on the object
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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>Ce n'est pas l'homme qui prend la mer, c'est la mer qui prend l'homme.
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Ce n'est pas l'homme qui prend la mer,
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c'est la mer qui prend l'homme.
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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="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>
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<A NAME="sec12"><H3>Standards Conformance</H3></A>
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<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>
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<BR>
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<HR>
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