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]
106 lines
9.2 KiB
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106 lines
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Tiers</title>
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<a accesskey="p" href="make_map.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.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="list_tie.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><h5 class="title">
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<a name="fusion.container.generation.functions.tiers"></a><a href="tiers.html" title="Tiers">Tiers</a></h5></div></div></div>
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<p>
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Tiers are sequences, where all elements are non-const reference types.
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They are constructed with a call to a couple of <span class="emphasis"><em>tie</em></span>
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function templates. The succeeding sections document the various <span class="emphasis"><em>tier</em></span>
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flavors.
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</p>
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<div class="itemizedlist"><ul type="disc">
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<li><a href="list_tie.html" title="list_tie"><tt class="computeroutput"><span class="identifier">list_tie</span></tt></a></li>
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<li><a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a></li>
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<li><a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">map_tie</span></tt></a></li>
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</ul></div>
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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="keyword">int</span> <span class="identifier">i</span><span class="special">;</span> <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span> <span class="keyword">double</span> <span class="identifier">d</span><span class="special">;</span>
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<span class="special">...</span>
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<a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">c</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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The <a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a> function creates
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a <a href="../../vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
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of type <tt class="computeroutput"><a href="../../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">char</span><span class="special">&,</span> <span class="keyword">double</span><span class="special">&></span></tt>. The same result could be achieved
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with the call <a href="make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a>(<a href="http://www.boost.org/doc/html/ref.html" target="_top"><tt class="computeroutput"><span class="identifier">ref</span></tt></a>(i), <a href="http://www.boost.org/doc/html/ref.html" target="_top"><tt class="computeroutput"><span class="identifier">ref</span></tt></a>(c), <a href="http://www.boost.org/doc/html/ref.html" target="_top"><tt class="computeroutput"><span class="identifier">ref</span></tt></a>(a))
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<sup>[<a name="id544767" href="#ftn.id544767">10</a>]</sup>
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.
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</p>
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<p>
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A <span class="emphasis"><em>tie</em></span> can be used to 'unpack' another tuple into
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variables. E.g.:
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</p>
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<pre class="programlisting">
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<span class="keyword">int</span> <span class="identifier">i</span><span class="special">;</span> <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span> <span class="keyword">double</span> <span class="identifier">d</span><span class="special">;</span>
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<a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">c</span><span class="special">,</span> <span class="identifier">d</span><span class="special">)</span> <span class="special">=</span> <a href="make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="char">'a'</span><span class="special">,</span> <span class="number">5.5</span><span class="special">);</span>
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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">i</span> <span class="special"><<</span> <span class="string">" "</span> <span class="special"><<</span> <span class="identifier">c</span> <span class="special"><<</span> <span class="string">" "</span> <span class="special"><<</span> <span class="identifier">d</span><span class="special">;</span>
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</pre>
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<p>
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This code prints 1 a 5.5 to the standard output stream. A sequence unpacking
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operation like this is found for example in ML and Python. It is convenient
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when calling functions which return sequences.
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</p>
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<a name="fusion.container.generation.functions.tiers.ignore"></a><h6>
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<a name="id545073"></a>
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<a href="tiers.html#fusion.container.generation.functions.tiers.ignore">Ignore</a>
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</h6>
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<p>
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There is also an object called <span class="emphasis"><em>ignore</em></span> which allows
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you to ignore an element assigned by a sequence. The idea is that a function
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may return a sequence, only part of which you are interested in. For
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example:
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</p>
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<pre class="programlisting">
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<span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span>
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<a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a><span class="special">(</span><span class="identifier">ignore</span><span class="special">,</span> <span class="identifier">c</span><span class="special">)</span> <span class="special">=</span> <a href="make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
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</pre>
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<div class="footnotes">
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<br><hr width="100" align="left">
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<div class="footnote"><p><sup>[<a name="ftn.id544767" href="#id544767">10</a>] </sup>
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see <a href="http://www.boost.org/doc/html/ref.html" target="_top">Boost.Ref</a>
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for details about <tt class="computeroutput"><span class="identifier">ref</span></tt>
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</p></div>
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</div>
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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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