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Eric Niebler b0a18ff5c1 Merged revisions 42180-42235 via svnmerge from 
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  r42194 | anthonyw | 2007-12-19 23:46:00 -0800 (Wed, 19 Dec 2007) | 1 line
  
  added missing parentheses
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  r42195 | anthonyw | 2007-12-20 00:37:02 -0800 (Thu, 20 Dec 2007) | 1 line
  
  added hardware_concurrency support for apple, freebsd and sun platforms
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  r42196 | niels_dekker | 2007-12-20 01:09:44 -0800 (Thu, 20 Dec 2007) | 1 line
  
  Removed "mark-expected-failures" from value_init_test, for both Borland and GCC, as value_init.hpp changeset [41942] provides a workaround for them.
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  r42202 | fmhess | 2007-12-20 06:39:53 -0800 (Thu, 20 Dec 2007) | 6 lines
  
  Made putting the name of a typedef inside
  a "classname" element successfully produce a link to the typedef's
  reference documentation, or to the typedef's synopsis if that is
  all it has.
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  r42217 | vladimir_prus | 2007-12-20 13:18:47 -0800 (Thu, 20 Dec 2007) | 1 line
  
  Explain a couple of gcc limitations with precompiled headers
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  r42220 | matias | 2007-12-20 13:56:39 -0800 (Thu, 20 Dec 2007) | 1 line
  
  add explicit std::string initialization
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  r42221 | matias | 2007-12-20 13:59:18 -0800 (Thu, 20 Dec 2007) | 1 line
  
  add license to each html page
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  r42222 | matias | 2007-12-20 14:15:11 -0800 (Thu, 20 Dec 2007) | 1 line
  
  Time out: test_bimap_property_map @ gcc-3.4.6_linux_x86_64
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  r42223 | djowel | 2007-12-20 15:24:28 -0800 (Thu, 20 Dec 2007) | 1 line
  
  Removing fusion variant adapter
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  r42224 | djowel | 2007-12-20 15:28:26 -0800 (Thu, 20 Dec 2007) | 1 line
  
  Removing fusion variant adapter
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  r42227 | nmusatti | 2007-12-20 23:03:44 -0800 (Thu, 20 Dec 2007) | 1 line
  
  Increased the latest supported version to 5.9.3, corresponding to the December 2007 update.
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  r42228 | anthonyw | 2007-12-21 02:54:59 -0800 (Fri, 21 Dec 2007) | 1 line
  
  Updated thread ID test
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  r42229 | anthonyw | 2007-12-21 03:05:37 -0800 (Fri, 21 Dec 2007) | 1 line
  
  Markup hardware_concurrency failure as expected on tru64 platforms, as support is not implemented
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  r42234 | dgregor | 2007-12-21 13:18:17 -0800 (Fri, 21 Dec 2007) | 1 line
  
  Reduce header dependencies, from Shunsuke Sogame. Fixes #1535
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[SVN r42236]
2007-12-21 22:19:06 +00:00

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<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.tuple.pairs"></a><a href="pairs.html" title="Pairs">Pairs</a></h3></div></div></div>
<a name="fusion.tuple.pairs.description"></a><h4>
<a name="id642910"></a>
<a href="pairs.html#fusion.tuple.pairs.description">Description</a>
</h4>
<p>
The <a href="http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1403.pdf" target="_top">TR1
Tuple</a> interface is specified to provide uniform access to <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt>
as if it were a 2 element tuple.
</p>
<a name="fusion.tuple.pairs.specification"></a><h4>
<a name="id642967"></a>
<a href="pairs.html#fusion.tuple.pairs.specification">Specification</a>
</h4>
<pre class="programlisting">
<span class="identifier">tuple_size</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">value</span>
</pre>
<p>
<span class="bold"><b>Type</b></span>: An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>
</p>
<p>
<span class="bold"><b>Value</b></span>: Returns 2, the number of elements
in a pair.
</p>
<pre class="programlisting">
<span class="identifier">tuple_element</span><span class="special">&lt;</span><span class="number">0</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Type</b></span>: <tt class="computeroutput"><span class="identifier">T1</span></tt>
</p>
<p>
<span class="bold"><b>Value</b></span>: Returns the type of the first element
of the pair
</p>
<pre class="programlisting">
<span class="identifier">tuple_element</span><span class="special">&lt;</span><span class="number">1</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Type</b></span>: <tt class="computeroutput"><span class="identifier">T2</span></tt>
</p>
<p>
<span class="bold"><b>Value</b></span>: Returns thetype of the second element
of the pair
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="identifier">I</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">&gt;</span>
<span class="identifier">P</span><span class="special">&amp;</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">&gt;&amp;</span> <span class="identifier">pr</span><span class="special">);</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="identifier">I</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">&gt;</span>
<span class="keyword">const</span> <span class="identifier">P</span><span class="special">&amp;</span> <span class="identifier">get</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">&gt;&amp;</span> <span class="identifier">pr</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Type</b></span>: If <tt class="computeroutput"><span class="identifier">I</span>
<span class="special">==</span> <span class="number">0</span></tt>
<tt class="computeroutput"><span class="identifier">P</span></tt> is <tt class="computeroutput"><span class="identifier">T1</span></tt>,
else if <tt class="computeroutput"><span class="identifier">I</span> <span class="special">==</span>
<span class="number">1</span></tt> <tt class="computeroutput"><span class="identifier">P</span></tt>
is <tt class="computeroutput"><span class="identifier">T2</span></tt> else the program is
ill-formed.
</p>
<p>
<span class="bold"><b>Returns: <tt class="computeroutput"><span class="identifier">pr</span><span class="special">.</span><span class="identifier">first</span></tt>
if <tt class="computeroutput"><span class="identifier">I</span> <span class="special">==</span>
<span class="number">0</span></tt> else <tt class="computeroutput"><span class="identifier">pr</span><span class="special">.</span><span class="identifier">second</span></tt>.</b></span>[*Returns:
<tt class="computeroutput"><span class="identifier">pr</span><span class="special">.</span><span class="identifier">first</span></tt> if <tt class="computeroutput"><span class="identifier">I</span>
<span class="special">==</span> <span class="number">0</span></tt>
else <tt class="computeroutput"><span class="identifier">pr</span><span class="special">.</span><span class="identifier">second</span></tt>.
</p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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