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| <HEAD> |
| <TITLE>istrstream</TITLE> |
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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> |
| <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> |
| |
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