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<div class="titlepage"><div><div><h5 class="title">
<a name="spirit.karma.reference.generator_concepts.unarygenerator"></a><a class="link" href="unarygenerator.html" title="UnaryGenerator">UnaryGenerator</a>
</h5></div></div></div>
<a name="spirit.karma.reference.generator_concepts.unarygenerator.description"></a><h6>
<a name="id1028767"></a>
<a class="link" href="unarygenerator.html#spirit.karma.reference.generator_concepts.unarygenerator.description">Description</a>
</h6>
<p>
<span class="emphasis"><em>UnaryGenerator</em></span> is a composite generator that has
a single subject. The UnaryGenerator may change the behavior of its subject
following the Delegate Design Pattern.
</p>
<a name="spirit.karma.reference.generator_concepts.unarygenerator.refinement_of"></a><h6>
<a name="id1028787"></a>
<a class="link" href="unarygenerator.html#spirit.karma.reference.generator_concepts.unarygenerator.refinement_of">Refinement
of</a>
</h6>
<div class="blockquote"><blockquote class="blockquote"><p>
<a class="link" href="generator.html" title="Generator"><code class="computeroutput"><span class="identifier">Generator</span></code></a>
</p></blockquote></div>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><code class="computeroutput"><span class="identifier">g</span></code></span></dt>
<dd><p>
A UnaryGenerator.
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">G</span></code></span></dt>
<dd><p>
A UnaryGenerator type.
</p></dd>
</dl>
</div>
<a name="spirit.karma.reference.generator_concepts.unarygenerator.valid_expressions"></a><h6>
<a name="id1028864"></a>
<a class="link" href="unarygenerator.html#spirit.karma.reference.generator_concepts.unarygenerator.valid_expressions">Valid
Expressions</a>
</h6>
<p>
In addition to the requirements defined in <a class="link" href="generator.html" title="Generator"><code class="computeroutput"><span class="identifier">Generator</span></code></a>, for any UnaryGenerator
the following must be met:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
<th>
<p>
Return type
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">g</span><span class="special">.</span><span class="identifier">subject</span></code>
</p>
</td>
<td>
<p>
Subject generator.
</p>
</td>
<td>
<p>
<a class="link" href="generator.html" title="Generator"><code class="computeroutput"><span class="identifier">Generator</span></code></a>
</p>
</td>
</tr></tbody>
</table></div>
<a name="spirit.karma.reference.generator_concepts.unarygenerator.type_expressions"></a><h6>
<a name="id1028984"></a>
<a class="link" href="unarygenerator.html#spirit.karma.reference.generator_concepts.unarygenerator.type_expressions">Type
Expressions</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">G</span><span class="special">::</span><span class="identifier">subject_type</span></code>
</p>
</td>
<td>
<p>
The subject generator type.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_unary_generator</span><span class="special"><</span><span class="identifier">G</span><span class="special">>::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
Metafunction that evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>
if a certain type, <code class="computeroutput"><span class="identifier">G</span></code>
is a UnaryGenerator, <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></code>
otherwise (See <a href="../../../../../../../../libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Boolean Constant</a>).
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="spirit.karma.reference.generator_concepts.unarygenerator.invariants"></a><h6>
<a name="id1029153"></a>
<a class="link" href="unarygenerator.html#spirit.karma.reference.generator_concepts.unarygenerator.invariants">Invariants</a>
</h6>
<p>
For any UnaryGenerator, <code class="computeroutput"><span class="identifier">G</span></code>,
the following invariant always holds:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_generator</span><span class="special"><</span><span class="identifier">G</span><span class="special">::</span><span class="identifier">subject_type</span><span class="special">>::</span><span class="identifier">type</span></code> evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>
</li></ul></div>
<a name="spirit.karma.reference.generator_concepts.unarygenerator.models"></a><h6>
<a name="id1029242"></a>
<a class="link" href="unarygenerator.html#spirit.karma.reference.generator_concepts.unarygenerator.models">Models</a>
</h6>
<p>
The following generators conform to this model:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="../operator/kleene.html" title="Kleene Star (*a)">Kleene Star
(unary <code class="computeroutput"><span class="special">*</span></code>)</a> operator,
</li>
<li class="listitem">
<a class="link" href="../operator/plus.html" title="Plus (+a)">Plus (unary
<code class="computeroutput"><span class="special">+</span></code>)</a> operator,
</li>
<li class="listitem">
<a class="link" href="../operator/optional.html" title="Optional (-a)">Optional
(unary <code class="computeroutput"><span class="special">-</span></code>)</a> operator,
</li>
<li class="listitem">
<a class="link" href="../operator/and_predicate.html" title="And-Predicate (&a)">And
predicate (unary <code class="computeroutput"><span class="special">&</span></code>)</a>
and <a class="link" href="../operator/not_predicate.html" title="Not-Predicate (!a)">Not
predicate (unary <code class="computeroutput"><span class="special">!</span></code>)</a>
operators,
</li>
<li class="listitem">
<a class="link" href="../directive/alignment.html" title="Alignment Directives (left_align[], center[], right_align[])"><code class="computeroutput"><span class="identifier">left_align</span></code></a>, <a class="link" href="../directive/alignment.html" title="Alignment Directives (left_align[], center[], right_align[])"><code class="computeroutput"><span class="identifier">center</span></code></a>, and <a class="link" href="../directive/alignment.html" title="Alignment Directives (left_align[], center[], right_align[])"><code class="computeroutput"><span class="identifier">right_align</span></code></a> directives,
</li>
<li class="listitem">
<a class="link" href="../directive/repeat.html" title="Repetition Directive (repeat[])"><code class="computeroutput"><span class="identifier">repeat</span></code></a> directive,
</li>
<li class="listitem">
<a class="link" href="../directive/delimit.html" title="Directives Controlling Automatic Delimiting (verbatim[], no_delimit[], delimit[])"><code class="computeroutput"><span class="identifier">verbatim</span></code></a> directive,
</li>
<li class="listitem">
<a class="link" href="../directive/delimit.html" title="Directives Controlling Automatic Delimiting (verbatim[], no_delimit[], delimit[])"><code class="computeroutput"><span class="identifier">delimit</span></code></a> directive,
</li>
<li class="listitem">
<a class="link" href="../directive/upperlower.html" title="Directives Controlling Case Sensitivity (upper[], lower[])"><code class="computeroutput"><span class="identifier">lower</span></code></a> and <a class="link" href="../directive/upperlower.html" title="Directives Controlling Case Sensitivity (upper[], lower[])"><code class="computeroutput"><span class="identifier">upper</span></code></a> directives,
</li>
<li class="listitem">
<a class="link" href="../directive/maxwidth.html" title="Controlling the Maximum Field Width (maxwidth[])"><code class="computeroutput"><span class="identifier">maxwidth</span></code></a> directive,
</li>
<li class="listitem">
<a class="link" href="../directive/buffer.html" title="Temporary Output Buffering (buffer[])"><code class="computeroutput"><span class="identifier">buffer</span></code></a> directive,
</li>
<li class="listitem">
<a class="link" href="../directive/omit.html" title="Consume Attribute (omit[] and skip[])"><code class="computeroutput"><span class="identifier">omit</span></code></a> directive.
</li>
</ul></div>
<p>
<span class="bold"><strong>FIXME</strong></span> Add more links to models of UnaryGenerator
concept
</p>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2010 Joel de Guzman, Hartmut Kaiser<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>)
</p>
</div></td>
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