forked from boostorg/fusion
Eric Niebler
48b5e30df8
https://svn.boost.org/svn/boost/trunk ........ r42067 | johnmaddock | 2007-12-15 04:32:18 -0800 (Sat, 15 Dec 2007) | 1 line MSVC warning suppression. ........ r42069 | bemandawes | 2007-12-15 06:26:16 -0800 (Sat, 15 Dec 2007) | 1 line Correct misspelling of library name ........ r42074 | johnmaddock | 2007-12-15 09:10:03 -0800 (Sat, 15 Dec 2007) | 1 line Fix error messages so they work with Boost.Format. ........ r42076 | johnmaddock | 2007-12-15 09:36:31 -0800 (Sat, 15 Dec 2007) | 1 line Trivial patches to silence MSVC warnings. ........ r42078 | johnmaddock | 2007-12-15 10:29:29 -0800 (Sat, 15 Dec 2007) | 1 line Disable long double tests if there's no long double support. ........ r42080 | johnmaddock | 2007-12-15 10:49:13 -0800 (Sat, 15 Dec 2007) | 1 line Yet another MSVC warning suppression. ........ r42082 | bgubenko | 2007-12-15 10:53:01 -0800 (Sat, 15 Dec 2007) | 1 line mark up Boost.Test tests for Linux ia64 gcc; make Boost.Interprocess unsupported on Linux ia64 gcc and PA-RISC ........ r42086 | anthonyw | 2007-12-15 14:34:30 -0800 (Sat, 15 Dec 2007) | 1 line added timed_wait overloads that take a duration ........ r42087 | anthonyw | 2007-12-15 14:36:43 -0800 (Sat, 15 Dec 2007) | 1 line explicit move functions for threads, with a test ........ r42105 | andreas_huber69 | 2007-12-16 06:58:24 -0800 (Sun, 16 Dec 2007) | 1 line Removed markup for now passing Sandia tests. ........ r42112 | bemandawes | 2007-12-16 14:39:32 -0800 (Sun, 16 Dec 2007) | 1 line Add intel-win-10.0 as required ........ r42116 | djowel | 2007-12-17 01:27:42 -0800 (Mon, 17 Dec 2007) | 1 line fixed documentation bug ........ r42117 | anthonyw | 2007-12-17 03:24:13 -0800 (Mon, 17 Dec 2007) | 1 line Updated move function test to be fair to Borland ........ r42118 | anthonyw | 2007-12-17 04:52:50 -0800 (Mon, 17 Dec 2007) | 1 line boost::move support for locks ........ r42119 | chris_kohlhoff | 2007-12-17 05:04:30 -0800 (Mon, 17 Dec 2007) | 2 lines Fixes for older HP-UX. ........ r42120 | chris_kohlhoff | 2007-12-17 05:08:10 -0800 (Mon, 17 Dec 2007) | 2 lines Bump version number. ........ r42121 | chris_kohlhoff | 2007-12-17 05:17:46 -0800 (Mon, 17 Dec 2007) | 2 lines Documentation fixes. ........ r42127 | bgubenko | 2007-12-17 10:06:11 -0800 (Mon, 17 Dec 2007) | 1 line markup test library test prg_exec_fail2 for PA-RISC ........ r42138 | johnmaddock | 2007-12-18 08:37:23 -0800 (Tue, 18 Dec 2007) | 1 line Fixes #1525. ........ r42141 | marshall | 2007-12-18 10:33:55 -0800 (Tue, 18 Dec 2007) | 1 line Patches to fixe #1423 and #1473 ........ r42145 | fmhess | 2007-12-18 12:14:01 -0800 (Tue, 18 Dec 2007) | 4 lines Prevented "classname"/"methodname"/etc. elements inside "type" elements inside "static-constant" elements from getting dropped. ........ r42164 | djowel | 2007-12-19 02:33:14 -0800 (Wed, 19 Dec 2007) | 1 line bug fix for end_impl. ........ r42165 | djowel | 2007-12-19 02:33:39 -0800 (Wed, 19 Dec 2007) | 1 line bug fix for end_impl. (test) ........ r42166 | anthonyw | 2007-12-19 02:39:45 -0800 (Wed, 19 Dec 2007) | 1 line Updated thread ID, and added tests ........ r42167 | djowel | 2007-12-19 02:42:04 -0800 (Wed, 19 Dec 2007) | 1 line tweakbug fix for end_impl (tweak). ........ r42168 | anthonyw | 2007-12-19 02:45:01 -0800 (Wed, 19 Dec 2007) | 1 line Implement hardware_concurrency for pthread ........ r42169 | johnmaddock | 2007-12-19 08:41:54 -0800 (Wed, 19 Dec 2007) | 1 line Fix graph title. ........ [SVN r42185]
142 lines
12 KiB
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142 lines
12 KiB
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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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<a accesskey="p" href="../operator.html"><img src="../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../operator.html"><img src="../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="i_o/in.html"><img src="../../../../../../../doc/html/images/next.png" alt="Next"></a>
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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.sequence.operator.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 <a href="../../sequence.html" title="Sequence">Sequence</a>(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 <a href="../../sequence.html" title="Sequence">Sequence</a>(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="../../sequence.html" title="Sequence">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="../../container/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="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
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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 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><p>
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Defines the character that is output before the first element.
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</p></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><p>
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Defines the character that is output after the last element.
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</p></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><p>
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Defines the delimiter character between elements.
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</p></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="../../container/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="../../container/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="../../container/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 <a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>(s) <tt class="computeroutput"><span class="identifier">i</span></tt>
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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 <a href="../../sequence.html" title="Sequence">Sequence</a>(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="../../sequence.html" title="Sequence">Sequence</a>
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representation may not be unambiguously parseable.
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</p>
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<a name="fusion.sequence.operator.i_o.header"></a><h5>
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<a name="id519768"></a>
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<a href="i_o.html#fusion.sequence.operator.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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<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">include</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"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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