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Eric Niebler 5b6d08974e Merged revisions 40861-40888 via svnmerge from 
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  r40862 | dave | 2007-11-06 15:39:09 -0800 (Tue, 06 Nov 2007) | 2 lines
  
  Added missing copyright/license
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  r40863 | djowel | 2007-11-06 18:12:28 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40864 | aaron_windsor | 2007-11-06 18:30:38 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40865 | djowel | 2007-11-06 18:34:18 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40866 | djowel | 2007-11-06 19:06:23 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40867 | djowel | 2007-11-06 19:23:31 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40868 | djowel | 2007-11-06 19:25:59 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40869 | djowel | 2007-11-06 19:27:38 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40870 | djowel | 2007-11-06 19:30:01 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40871 | djowel | 2007-11-06 19:35:49 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40872 | djowel | 2007-11-06 19:37:51 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40873 | djowel | 2007-11-06 19:46:23 -0800 (Tue, 06 Nov 2007) | 1 line
  
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  r40874 | chris_kohlhoff | 2007-11-06 22:49:36 -0800 (Tue, 06 Nov 2007) | 2 lines
  
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  r40875 | chris_kohlhoff | 2007-11-06 22:53:17 -0800 (Tue, 06 Nov 2007) | 2 lines
  
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  r40876 | chris_kohlhoff | 2007-11-06 23:23:53 -0800 (Tue, 06 Nov 2007) | 2 lines
  
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  r40877 | joaquin | 2007-11-07 00:45:27 -0800 (Wed, 07 Nov 2007) | 1 line
  
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  r40878 | johnmaddock | 2007-11-07 02:07:08 -0800 (Wed, 07 Nov 2007) | 1 line
  
  Ooops, got the pp-logic wrong and disable long double support for all Unix platforms, instead of just Intel on Linux prior to version 10.
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  r40879 | johnmaddock | 2007-11-07 02:09:50 -0800 (Wed, 07 Nov 2007) | 1 line
  
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  r40880 | t_schwinger | 2007-11-07 02:14:42 -0800 (Wed, 07 Nov 2007) | 3 lines
  
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  r40881 | johnmaddock | 2007-11-07 03:50:02 -0800 (Wed, 07 Nov 2007) | 1 line
  
  Change test (again) so that the range of values tested matches original test: last change started testing more extreme input values, which caused regressions on Mac OS X.
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  r40882 | johnmaddock | 2007-11-07 03:59:39 -0800 (Wed, 07 Nov 2007) | 3 lines
  
  Disabled use of long double when BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined.
  Disabled special-double precision error rates when BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined.
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  r40883 | johnmaddock | 2007-11-07 04:04:01 -0800 (Wed, 07 Nov 2007) | 1 line
  
  Oops get the name of test right!
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  r40884 | anthonyw | 2007-11-07 04:10:17 -0800 (Wed, 07 Nov 2007) | 1 line
  
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  r40885 | garcia | 2007-11-07 04:25:16 -0800 (Wed, 07 Nov 2007) | 2 lines
  
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  r40886 | garcia | 2007-11-07 05:38:53 -0800 (Wed, 07 Nov 2007) | 2 lines
  
  Exception was accepted.
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  r40887 | fcacciola | 2007-11-07 06:12:15 -0800 (Wed, 07 Nov 2007) | 1 line
  
  Added explicit failures for newly discovered GCC const ref binding bug (see Ticket #1301)
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[SVN r40891]
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<title>Forward
Sequence</title>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.sequence.concepts.forward_sequence"></a><a href="forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a></h4></div></div></div>
<a name="fusion.sequence.concepts.forward_sequence.description"></a><h5>
<a name="id487819"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.description">Description</a>
</h5>
<p>
A Forward Sequence is a Sequence whose elements are arranged in a definite
order. The ordering is guaranteed not to change from iteration to iteration.
The requirement of a definite ordering allows the definition of element-by-element
equality (if the container's element type is Equality Comparable) and of
lexicographical ordering (if the container's element type is LessThan Comparable).
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">s</span></tt></span></dt>
<dd><p>
A Forward Sequence
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">S</span></tt></span></dt>
<dd><p>
A Forward Sequence type
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">o</span></tt></span></dt>
<dd><p>
An arbitrary object
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">e</span></tt></span></dt>
<dd><p>
A Sequence element
</p></dd>
</dl>
</div>
<a name="fusion.sequence.concepts.forward_sequence.valid_expressions"></a><h5>
<a name="id487955"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.valid_expressions">Valid
Expressions</a>
</h5>
<p>
For any Forward Sequence the following expressions must be valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Type Requirements
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="../../iterator/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="../../iterator/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>. Convertible to int.
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Boolean Constant</a>. Convertible to bool.
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span>
<span class="special">=</span> <span class="identifier">o</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
<tt class="computeroutput"><span class="identifier">s</span></tt> is mutable and
<tt class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
<span class="identifier">o</span></tt>, where <tt class="computeroutput"><span class="identifier">e</span></tt> is the first element in the
sequence, is a valid expression.
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.forward_sequence.result_type_expressions"></a><h5>
<a name="id488539"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.result_type_expressions">Result
Type Expressions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Compile Time Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/metafunctions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/metafunctions/end.html" title="end"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Unspecified
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/metafunctions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/metafunctions/front.html" title="front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.forward_sequence.expression_semantics"></a><h5>
<a name="id488958"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.expression_semantics">Expression
Semantics</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
An iterator to the first element of the sequence; see <a href="../intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
A past-the-end iterator to the sequence; see <a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
The size of the sequence; see <a href="../intrinsic/functions/size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
A boolean Integral Constant <tt class="computeroutput"><span class="identifier">c</span></tt>
such that <tt class="computeroutput"><span class="identifier">c</span><span class="special">::</span><span class="identifier">value</span> <span class="special">==</span>
<span class="keyword">true</span></tt> if and only if the
sequence is empty; see <a href="../intrinsic/functions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
The first element in the sequence; see <a href="../intrinsic/functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a>.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.forward_sequence.invariants"></a><h5>
<a name="id489427"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.invariants">Invariants</a>
</h5>
<p>
For any Forward Sequence s the following invariants always hold:
</p>
<div class="itemizedlist"><ul type="disc">
<li>
<tt class="computeroutput"><span class="special">[</span><a href="../intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">),</span> <a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">))</span></tt> is always a valid range.
</li>
<li>
An <a href="../../algorithm.html" title="Algorithm">Algorithm</a> that iterates through
the range <tt class="computeroutput"><span class="special">[</span><a href="../intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">),</span> <a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">))</span></tt> will pass through every element of
<tt class="computeroutput"><span class="identifier">s</span></tt> exactly once.
</li>
<li>
<tt class="computeroutput"><a href="../intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
is identical to <tt class="computeroutput"><a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">))</span></tt>
if and only if <tt class="computeroutput"><span class="identifier">s</span></tt> is empty.
</li>
<li>
Two different iterations through <tt class="computeroutput"><span class="identifier">s</span></tt>
will access its elements in the same order.
</li>
</ul></div>
<a name="fusion.sequence.concepts.forward_sequence.models"></a><h5>
<a name="id489739"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li><a href="../../adapted/std__pair.html" title="std::pair"><tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt></a></li>
<li><a href="../../adapted/boost__array.html" title="boost::array"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt></a></li>
<li><a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a></li>
<li><a href="../../container/cons.html" title="cons"><tt class="computeroutput"><span class="identifier">cons</span></tt></a></li>
<li><a href="../../container/list.html" title="list"><tt class="computeroutput"><span class="identifier">list</span></tt></a></li>
<li><a href="../../container/set.html" title="set"><tt class="computeroutput"><span class="identifier">set</span></tt></a></li>
<li><a href="../../container/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a></li>
<li><a href="../../view/single_view.html" title="single_view"><tt class="computeroutput"><span class="identifier">single_view</span></tt></a></li>
<li><a href="../../view/filter_view.html" title="filter_view"><tt class="computeroutput"><span class="identifier">filter_view</span></tt></a></li>
<li><a href="../../view/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a></li>
<li><a href="../../view/joint_view.html" title="joint_view"><tt class="computeroutput"><span class="identifier">joint_view</span></tt></a></li>
<li><a href="../../view/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a></li>
<li><a href="../../view/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a></li>
<li><a href="../../view/zip_view.html" title="zip_view"><tt class="computeroutput"><span class="identifier">zip_view</span></tt></a></li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer"><small>Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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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