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339 lines
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<title>Bidirectional Sequence</title>
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<div class="section" title="Bidirectional Sequence">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="fusion.sequence.concepts.bidirectional_sequence"></a><a class="link" href="bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
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Sequence</a>
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</h4></div></div></div>
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<a name="fusion.sequence.concepts.bidirectional_sequence.description"></a><h6>
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<a name="id696092"></a>
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<a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.description">Description</a>
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</h6>
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<p>
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A Bidirectional Sequence is a <a class="link" href="forward_sequence.html" title="Forward Sequence">Forward
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Sequence</a> whose iterators model <a class="link" href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
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Iterator</a>.
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</p>
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<a name="fusion.sequence.concepts.bidirectional_sequence.refinement_of"></a><h6>
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<a name="id696123"></a>
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<a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.refinement_of">Refinement
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of</a>
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</h6>
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<p>
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<a class="link" href="forward_sequence.html" title="Forward Sequence">Forward Sequence</a>
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</p>
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<div class="variablelist" title="Notation">
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<p class="title"><b>Notation</b></p>
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<dl>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt>
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<dd><p>
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A Forward Sequence
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">S</span></code></span></dt>
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<dd><p>
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A Forward Sequence type
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">o</span></code></span></dt>
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<dd><p>
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An arbitrary object
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</p></dd>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">e</span></code></span></dt>
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<dd><p>
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A Sequence element
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</p></dd>
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</dl>
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</div>
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<a name="fusion.sequence.concepts.bidirectional_sequence.valid_expressions"></a><h6>
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<a name="id696226"></a>
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<a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.valid_expressions">Valid
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Expressions</a>
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</h6>
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<p>
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In addition to the requirements defined in <a class="link" href="forward_sequence.html" title="Forward Sequence">Forward
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Sequence</a>, for any Bidirectional Sequence the following must be met:
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Expression
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</p>
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</th>
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<th>
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<p>
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Return type
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</p>
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</th>
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<th>
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<p>
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Type Requirements
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</p>
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</th>
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<th>
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<p>
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Runtime Complexity
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../intrinsic/functions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">begin</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<a class="link" href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
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Iterator</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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</td>
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<td>
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<p>
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Constant
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../intrinsic/functions/end.html" title="end"><code class="computeroutput"><span class="identifier">end</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<a class="link" href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
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Iterator</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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</td>
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<td>
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<p>
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Constant
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../intrinsic/functions/back.html" title="back"><code class="computeroutput"><span class="identifier">back</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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Any type
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</p>
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</td>
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<td>
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<p>
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</p>
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</td>
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<td>
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<p>
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Constant
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../intrinsic/functions/back.html" title="back"><code class="computeroutput"><span class="identifier">back</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span>
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<span class="special">=</span> <span class="identifier">o</span></code>
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</p>
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</td>
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<td>
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<p>
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Any type
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">s</span></code> is mutable and
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<code class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
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<span class="identifier">o</span></code>, where <code class="computeroutput"><span class="identifier">e</span></code> is the first element in the
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sequence, is a valid expression.
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</p>
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</td>
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<td>
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<p>
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Constant
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<a name="fusion.sequence.concepts.bidirectional_sequence.result_type_expressions"></a><h6>
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<a name="id696550"></a>
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<a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.result_type_expressions">Result
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Type Expressions</a>
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</h6>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Expression
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</p>
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</th>
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<th>
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<p>
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Compile Time Complexity
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../intrinsic/metafunctions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></code></a><span class="special"><</span><span class="identifier">S</span><span class="special">>::</span><span class="identifier">type</span></code>
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</p>
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</td>
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<td>
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<p>
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Amortized constant time
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../intrinsic/metafunctions/end.html" title="end"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></code></a><span class="special"><</span><span class="identifier">S</span><span class="special">>::</span><span class="identifier">type</span></code>
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</p>
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</td>
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<td>
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<p>
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Amortized constant time
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../intrinsic/metafunctions/back.html" title="back"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span></code></a><span class="special"><</span><span class="identifier">S</span><span class="special">>::</span><span class="identifier">type</span></code>
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</p>
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</td>
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<td>
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<p>
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Amortized constant time
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<a name="fusion.sequence.concepts.bidirectional_sequence.expression_semantics"></a><h6>
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<a name="id696753"></a>
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<a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.expression_semantics">Expression
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Semantics</a>
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</h6>
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<p>
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The semantics of an expression are defined only where they differ from,
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or are not defined in <a class="link" href="forward_sequence.html" title="Forward Sequence">Forward
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Sequence</a>.
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Expression
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</p>
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</th>
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<th>
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<p>
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Semantics
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../intrinsic/functions/back.html" title="back"><code class="computeroutput"><span class="identifier">back</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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The last element in the sequence; see <a class="link" href="../intrinsic/functions/back.html" title="back"><code class="computeroutput"><span class="identifier">back</span></code></a>.
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</p>
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</td>
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</tr></tbody>
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</table></div>
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<a name="fusion.sequence.concepts.bidirectional_sequence.models"></a><h6>
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<a name="id696858"></a>
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<a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.models">Models</a>
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</h6>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem"><a class="link" href="../../adapted/std__pair.html" title="std::pair"><code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></code></a></li>
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<li class="listitem"><a class="link" href="../../adapted/boost__array.html" title="boost::array"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></code></a></li>
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<li class="listitem"><a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a></li>
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<li class="listitem"><a class="link" href="../../view/reverse_view.html" title="reverse_view"><code class="computeroutput"><span class="identifier">reverse_view</span></code></a></li>
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<li class="listitem">
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<a class="link" href="../../view/iterator_range.html" title="iterator_range"><code class="computeroutput"><span class="identifier">iterator_range</span></code></a>
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(where adapted sequence is a Bidirectional Sequence)
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</li>
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<li class="listitem">
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<a class="link" href="../../view/transform_view.html" title="transform_view"><code class="computeroutput"><span class="identifier">transform_view</span></code></a>
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(where adapted sequence is a Bidirectional Sequence)
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</li>
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<li class="listitem">
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<a class="link" href="../../view/zip_view.html" title="zip_view"><code class="computeroutput"><span class="identifier">zip_view</span></code></a>
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(where adapted sequences are models Bidirectional Sequence)
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</li>
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</ul></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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</p>
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</div></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="forward_sequence.html"><img src="../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="random_access_sequence.html"><img src="../../../../../../../doc/html/images/next.png" alt="Next"></a>
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