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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Memory Based Streams</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.77.1" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="io.html" title="Chapter 13.  Input and Output" /><link rel="prev" href="streambufs.html" title="Stream Buffers" /><link rel="next" href="fstreams.html" title="File Based Streams" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Memory Based Streams</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="streambufs.html">Prev</a> </td><th width="60%" align="center">Chapter 13. 
- Input and Output
-
-</th><td width="20%" align="right"> <a accesskey="n" href="fstreams.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="std.io.memstreams"></a>Memory Based Streams</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="std.io.memstreams.compat"></a>Compatibility With strstream</h3></div></div></div><p>
- </p><p>Stringstreams (defined in the header <code class="code">&lt;sstream&gt;</code>)
- are in this author's opinion one of the coolest things since
- sliced time. An example of their use is in the Received Wisdom
- section for Sect1 21 (Strings),
- <a class="link" href="strings.html#strings.string.Cstring" title="CString (MFC)"> describing how to
- format strings</a>.
- </p><p>The quick definition is: they are siblings of ifstream and ofstream,
- and they do for <code class="code">std::string</code> what their siblings do for
- files. All that work you put into writing <code class="code">&lt;&lt;</code> and
- <code class="code">&gt;&gt;</code> functions for your classes now pays off
- <span class="emphasis"><em>again!</em></span> Need to format a string before passing the string
- to a function? Send your stuff via <code class="code">&lt;&lt;</code> to an
- ostringstream. You've read a string as input and need to parse it?
- Initialize an istringstream with that string, and then pull pieces
- out of it with <code class="code">&gt;&gt;</code>. Have a stringstream and need to
- get a copy of the string inside? Just call the <code class="code">str()</code>
- member function.
- </p><p>This only works if you've written your
- <code class="code">&lt;&lt;</code>/<code class="code">&gt;&gt;</code> functions correctly, though,
- and correctly means that they take istreams and ostreams as
- parameters, not i<span class="emphasis"><em>f</em></span>streams and o<span class="emphasis"><em>f</em></span>streams. If they
- take the latter, then your I/O operators will work fine with
- file streams, but with nothing else -- including stringstreams.
- </p><p>If you are a user of the strstream classes, you need to update
- your code. You don't have to explicitly append <code class="code">ends</code> to
- terminate the C-style character array, you don't have to mess with
- "freezing" functions, and you don't have to manage the
- memory yourself. The strstreams have been officially deprecated,
- which means that 1) future revisions of the C++ Standard won't
- support them, and 2) if you use them, people will laugh at you.
- </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="streambufs.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="io.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="fstreams.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Stream Buffers </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> File Based Streams</td></tr></table></div></body></html> \ No newline at end of file