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| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.lex.reference.lexer_concepts.unarylexer"></a><a class="link" href="unarylexer.html" title="UnaryLexer">UnaryLexer</a> |
| </h5></div></div></div> |
| <a name="spirit.lex.reference.lexer_concepts.unarylexer.description"></a><h6> |
| <a name="id1147113"></a> |
| <a class="link" href="unarylexer.html#spirit.lex.reference.lexer_concepts.unarylexer.description">Description</a> |
| </h6> |
| <p> |
| <span class="emphasis"><em>UnaryLexer</em></span> is a composite lexer component that has |
| a single subject. The UnaryLexer may change the behavior of its subject |
| following the Delegate Design Pattern. |
| </p> |
| <a name="spirit.lex.reference.lexer_concepts.unarylexer.refinement_of"></a><h6> |
| <a name="id1147138"></a> |
| <a class="link" href="unarylexer.html#spirit.lex.reference.lexer_concepts.unarylexer.refinement_of">Refinement |
| of</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| <a class="link" href="lexer.html" title="Lexer"><code class="computeroutput"><span class="identifier">Lexer</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">l</span></code></span></dt> |
| <dd><p> |
| A UnaryLexer. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">L</span></code></span></dt> |
| <dd><p> |
| A UnaryLexer type. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="spirit.lex.reference.lexer_concepts.unarylexer.valid_expressions"></a><h6> |
| <a name="id1147216"></a> |
| <a class="link" href="unarylexer.html#spirit.lex.reference.lexer_concepts.unarylexer.valid_expressions">Valid |
| Expressions</a> |
| </h6> |
| <p> |
| In addition to the requirements defined in <a class="link" href="lexer.html" title="Lexer"><code class="computeroutput"><span class="identifier">Lexer</span></code></a>, for any UnaryLexer 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">l</span><span class="special">.</span><span class="identifier">subject</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Subject lexer component. |
| </p> |
| </td> |
| <td> |
| <p> |
| <a class="link" href="lexer.html" title="Lexer"><code class="computeroutput"><span class="identifier">Lexer</span></code></a> |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <a name="spirit.lex.reference.lexer_concepts.unarylexer.type_expressions"></a><h6> |
| <a name="id1147338"></a> |
| <a class="link" href="unarylexer.html#spirit.lex.reference.lexer_concepts.unarylexer.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">L</span><span class="special">::</span><span class="identifier">subject_type</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The subject lexer component type. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_unary_lexer</span><span class="special"><</span><span class="identifier">L</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">L</span></code> |
| is a UnaryLexer, <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.lex.reference.lexer_concepts.unarylexer.invariants"></a><h6> |
| <a name="id1147512"></a> |
| <a class="link" href="unarylexer.html#spirit.lex.reference.lexer_concepts.unarylexer.invariants">Invariants</a> |
| </h6> |
| <p> |
| For any UnaryLexer, <code class="computeroutput"><span class="identifier">L</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_lexer</span><span class="special"><</span><span class="identifier">L</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.lex.reference.lexer_concepts.unarylexer.models"></a><h6> |
| <a name="id1147600"></a> |
| <a class="link" href="unarylexer.html#spirit.lex.reference.lexer_concepts.unarylexer.models">Models</a> |
| </h6> |
| <p> |
| The following lexer components conform to this model: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| action lexer component (allowing to attach semantic actions) |
| </li></ul></div> |
| <p> |
| <span class="bold"><strong>FIXME</strong></span> Add more links to models of UnaryLexer |
| concept |
| </p> |
| </div> |
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| <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>) |
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