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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> <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 <sstream> |
| |
| namespace std { |
| template<class charT, class traits = char_traits<charT>, |
| class Allocator = allocator<charT> > |
| 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<class charT, class traits = char_traits<charT>, |
| class Allocator = allocator<void> > |
| class basic_istringstream |
| : public basic_istream<charT, traits> |
| |
| { |
| 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<char_type, |
| traits_type, |
| allocator_type>&, |
| ios_base::openmode = ios_base::in); |
| virtual ~basic_istringstream(); |
| basic_stringbuf<char_type, traits_type, allocator_type> * |
| rdbuf() const; |
| basic_string<char_type, traits_type, allocator_type> |
| str() const; |
| void |
| str(const basic_string<char_type, traits_type, |
| allocator_type>&); |
| |
| }; |
| } |
| </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<char> 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<wchar_t> 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<char_type,traits_type,<br> allocator_type>(which)</SAMP></P> |
| </UL> |
| |
| |
| <A NAME="idx197"></A><PRE>explicit |
| <B>basic_istringstream</B>(const basic_string<char_type, traits_type, |
| allocator_type>& 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<char_type, traits_type,<br> allocator_type>(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<char_type, traits_type, allocator_type>* |
| <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<char_type, traits_type, allocator_type> |
| <B>str</B>() const; </PRE> |
| <UL> |
| <P>Returns <SAMP>rdbuf()->str()</SAMP>.</P> |
| </UL> |
| |
| |
| <A NAME="idx201"></A><PRE>void |
| <B>str</B>(const basic_string<char_type, traits_type, |
| allocator_type>& str); </PRE> |
| <UL> |
| <P>Calls <SAMP>rdbuf()->str(str)</SAMP>. </P> |
| </UL> |
| |
| <A NAME="sec11"><H3>Example</H3></A> |
| |
| <UL><PRE>// |
| // istringstream.cpp |
| // |
| |
| #include <iomanip> // for setw |
| #include <iostream> // for wcout, dec, endl, hex, oct, wostream |
| #include <sstream> // for strstream, wistringstream |
| #include <string> // 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 << "Il avait l'air heureux." << 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 << std::endl; |
| else |
| std::wcout << c; |
| } |
| |
| std::wcout << 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 << 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 >> buf) { |
| std::wcout.width (10); |
| std::wcout << buf << std::endl; |
| } |
| |
| std::wcout << std::endl; |
| |
| // clear flags, last in >> buf set fail bit |
| // because of a newline at end of string |
| in.clear (); |
| |
| // output the base info before each integer |
| out << std::showbase; |
| |
| std::wostream::pos_type pos= out.tellp (); |
| |
| const long l = 10; |
| |
| // output l in hex with a field with of 10 |
| out << std::hex << std::setw (10) << l << std::endl; |
| |
| // output l in oct with a field with of 10 |
| out << std::oct << std::setw (10) << l << std::endl; |
| |
| // output l in dec with a field with of 10 |
| out << std::dec << std::setw (10) << l << std::endl; |
| |
| // move back to the beginning of the stream |
| in.seekg (0); |
| |
| // output the entire stream |
| std::wcout << in.rdbuf () << 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 >> a >> b >> d; |
| |
| // output 3 times 10 |
| std::wcout << a << std::endl << b << std::endl |
| << d << std::endl; |
| } |
| catch (std::ios::failure &e) { |
| std::wcerr << e.what () << 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> |
| |
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