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adding fusion docs and tests
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doc/html/fusion/sequences/operators/i_o.html
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>I/O</title>
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<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<link rel="start" href="../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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<link rel="up" href="../operators.html" title="Operators">
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<link rel="prev" href="../operators.html" title="Operators">
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<link rel="next" href="i_o/in.html" title="in">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%">
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<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td>
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<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
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<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
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<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
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<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
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<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
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</table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="../operators.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../operators.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="i_o/in.html"><img src="../../../images/next.png" alt="Next"></a>
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</div>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="fusion.sequences.operators.i_o"></a><a href="i_o.html" title="I/O">I/O</a></h4></div></div></div>
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<div class="toc"><dl>
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<dt><span class="section"><a href="i_o/in.html">in</a></span></dt>
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<dt><span class="section"><a href="i_o/out.html">out</a></span></dt>
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</dl></div>
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<p>
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The I/O operators: <tt class="computeroutput"><span class="special"><<</span></tt>
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and <tt class="computeroutput"><span class="special">>></span></tt> work generically
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on all Fusion sequences. The global <tt class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></tt> has been overloaded for generic
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output streams such that <span class="underline">_sequence</span>_s
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are output by recursively calling <tt class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></tt> for each element. Analogously,
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the global <tt class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></tt>
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has been overloaded to extract <span class="underline">_sequence</span>_s
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from generic input streams by recursively calling <tt class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></tt> for each element.
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</p>
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<p>
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The default delimiter between the elements is space, and the <a href="../../sequences.html" title="Sequences">Sequence</a>
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is enclosed in parenthesis. For Example:
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</p>
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<pre class="programlisting">
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<a href="../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">float</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="identifier">a</span><span class="special">(</span><span class="number">1.0f</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">"Howdy folks!"</span><span class="special">);</span>
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<span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">a</span><span class="special">;</span>
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</pre>
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<p>
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outputs the <a href="../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a> as: (1.0 2 Howdy folks!)
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</p>
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<p>
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The library defines three manipulators for changing the default behavior:
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</p>
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<div class="variablelist">
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<p class="title"><b>Manipulators</b></p>
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<dl>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_open</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
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<dd>
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Defines the character that is output before the first element.
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</dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_close</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
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<dd>
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Defines the character that is output after the last element.
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</dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_delimiter</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
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<dd>
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Defines the delimiter character between elements.
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</dd>
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</dl>
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</div>
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<p>
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The argument to <tt class="computeroutput"><span class="identifier">tuple_open</span></tt>,
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<tt class="computeroutput"><span class="identifier">tuple_close</span></tt> and <tt class="computeroutput"><span class="identifier">tuple_delimiter</span></tt> may be a <tt class="computeroutput"><span class="keyword">char</span></tt>, <tt class="computeroutput"><span class="keyword">wchar_t</span></tt>,
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a C-string, or a wide C-string.
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</p>
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<p>
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Example:
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</p>
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<pre class="programlisting">
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">tuple_open</span><span class="special">(</span><span class="char">'['</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">tuple_close</span><span class="special">(</span><span class="char">']'</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">tuple_delimiter</span><span class="special">(</span><span class="string">", "</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">a</span><span class="special">;</span>
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</pre>
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<p>
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outputs the same <a href="../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>, <tt class="computeroutput"><span class="identifier">a</span></tt>
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as: [1.0, 2, Howdy folks!]
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</p>
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<p>
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The same manipulators work with <tt class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></tt> and <tt class="computeroutput"><span class="identifier">istream</span></tt>
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as well. Suppose the <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span></tt>
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stream contains the following data:
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</p>
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<pre class="programlisting">
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<span class="special">(</span><span class="number">1</span> <span class="number">2</span> <span class="number">3</span><span class="special">)</span> <span class="special">[</span><span class="number">4</span><span class="special">:</span><span class="number">5</span><span class="special">]</span>
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</pre>
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<p>
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The code:
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</p>
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<pre class="programlisting">
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<a href="../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">i</span><span class="special">;</span>
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<a href="../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">j</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">>></span> <span class="identifier">i</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">>></span> <span class="identifier">set_open</span><span class="special">(</span><span class="char">'['</span><span class="special">)</span> <span class="special">>></span> <span class="identifier">set_close</span><span class="special">(</span><span class="char">']'</span><span class="special">)</span> <span class="special">>></span> <span class="identifier">set_delimiter</span><span class="special">(</span><span class="char">':'</span><span class="special">);</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">>></span> <span class="identifier">j</span><span class="special">;</span>
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</pre>
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<p>
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reads the data into the <span class="underline">_vector</span>_s
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<tt class="computeroutput"><span class="identifier">i</span></tt> and <tt class="computeroutput"><span class="identifier">j</span></tt>.
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</p>
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<p>
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Note that extracting <span class="underline">_sequence</span>_s
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with <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></tt> or C-style string elements does
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not generally work, since the streamed <a href="../../sequences.html" title="Sequences">Sequence</a>
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representation may not be unambiguously parseable.
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</p>
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<a name="fusion.sequences.operators.i_o.header"></a><h5>
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<a name="id538225"></a>
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<a href="i_o.html#fusion.sequences.operators.i_o.header">Header</a>
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</h5>
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<pre class="programlisting">
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">sequence</span><span class="special">/</span><span class="identifier">io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="../operators.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../operators.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="i_o/in.html"><img src="../../../images/next.png" alt="Next"></a>
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</div>
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</body>
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</html>
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