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| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.qi.reference.directive.as"></a><a class="link" href="as.html" title="Parser Directives Forcing Atomic Assignment (as<T>, as_string[], as_wstring[])">Parser Directives |
| Forcing Atomic Assignment (<code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">>,</span> <span class="identifier">as_string</span><span class="special">[],</span> <span class="identifier">as_wstring</span><span class="special">[]</span></code>)</a> |
| </h5></div></div></div> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h0"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.description"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.description">Description</a> |
| </h6> |
| <p> |
| The <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> |
| class forces the atomic assignment of it's subject's synthesized attribute. |
| Usually, repetitive parsers (such as <a class="link" href="../operator/kleene.html" title="Kleene Parser (*a)">Kleene</a>, |
| etc) or sequences exposing a <code class="computeroutput"><span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span></code> will assign elements to the container |
| supplied as their synthesized attribute by calling <a class="link" href="../../../advanced/customize/store_value/push_back.html" title="Store a Parsed Attribute Value into a Container (Qi)"><code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">push_back_container</span></code></a> repeatedly. |
| In some cases, this may be undesirable. The <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> class creates a directive that will |
| pass a temporary object of type <code class="computeroutput"><span class="identifier">T</span></code> |
| to it's subject. If the subject parser passes, the temporary object will |
| be assigned to the directive's supplied attribute with a single call |
| to <a class="link" href="../../../advanced/customize/assign_to.html" title="Store a Parsed Attribute Value (Qi)"><code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">assign_to</span></code></a>. If the subject parser |
| fails, the directive's attribute is not mutated. |
| </p> |
| <div class="note"><table border="0" summary="Note"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| <code class="computeroutput"><span class="identifier">T</span></code> is required to be |
| a container type. If <a class="link" href="../../../advanced/customize/is_container.html" title="Determine if a Type Should be Treated as a Container (Qi and Karma)"><code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_container</span></code></a> does not return |
| true for <code class="computeroutput"><span class="identifier">T</span></code>, a compile-time |
| error will occur. |
| </p></td></tr> |
| </table></div> |
| <div class="note"><table border="0" summary="Note"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| The <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> |
| implicitly causes commit/rollback semantics similar in nature to the |
| <a class="link" href="hold.html" title="Parser Directive for Attribute Commit/Rollback (hold[])"><code class="computeroutput"><span class="identifier">hold</span></code></a> |
| directive. |
| </p></td></tr> |
| </table></div> |
| <div class="caution"><table border="0" summary="Caution"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../../../../images/caution.png"></td> |
| <th align="left">Caution</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| The <a class="link" href="../../../advanced/customize/assign_to.html" title="Store a Parsed Attribute Value (Qi)"><code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">assign_to</span></code></a> customization point |
| may end up using <a class="link" href="../../../advanced/customize/store_value/push_back.html" title="Store a Parsed Attribute Value into a Container (Qi)"><code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">push_back_container</span></code></a> to assign |
| the temporary object to the supplied attribute by default, depending |
| on the types involved. Use the interface described in <a class="link" href="../../../advanced/customize.html" title="Customization of Spirit's Attribute Handling">Customization |
| of Attribute Handling</a> to manipulate the semantics of this assignment |
| operation. |
| </p></td></tr> |
| </table></div> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h1"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.header"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.header">Header</a> |
| </h6> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/directive/as.hpp></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">spirit</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_as</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <p> |
| Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>. |
| </p> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h2"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.namespace"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.namespace">Namespace</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup><col></colgroup> |
| <thead><tr><th> |
| <p> |
| Name |
| </p> |
| </th></tr></thead> |
| <tbody> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">as</span> <span class="comment">// alias: |
| boost::spirit::qi::as</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">as_string</span> <span class="comment">// |
| alias: boost::spirit::qi::as_string</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">as_wstring</span> <span class="comment">// |
| alias: boost::spirit::qi::as_wstring</span></code> |
| </p> |
| </td></tr> |
| </tbody> |
| </table></div> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h3"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.synopsis"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.synopsis">Synopsis</a> |
| </h6> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">as</span><span class="special">;</span> |
| </pre> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h4"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.template_parameters"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.template_parameters">Template |
| parameters</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| <th> |
| <p> |
| Default |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">T</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A container type. [none |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h5"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.model_of"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.model_of">Model |
| of</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| <a class="link" href="../parser_concepts/unaryparser.html" title="UnaryParser"><code class="computeroutput"><span class="identifier">UnaryParser</span></code></a> |
| </p></blockquote></div> |
| <div class="variablelist"> |
| <p class="title"><b>Notation</b></p> |
| <dl class="variablelist"> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">a</span></code></span></dt> |
| <dd><p> |
| A <a class="link" href="../parser_concepts/parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">t</span></code></span></dt> |
| <dd><p> |
| A container of type <code class="computeroutput"><span class="identifier">T</span></code>. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">attr</span></code></span></dt> |
| <dd><p> |
| The attribute supplied to the directive. |
| </p></dd> |
| </dl> |
| </div> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h6"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.expression_semantics"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.expression_semantics">Expression |
| Semantics</a> |
| </h6> |
| <p> |
| Semantics of an expression is defined only where it differs from, or |
| is not defined in <a class="link" href="../parser_concepts/unaryparser.html" title="UnaryParser"><code class="computeroutput"><span class="identifier">UnaryParser</span></code></a>. |
| </p> |
| <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> |
| <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">>()[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Create a temporary object of <code class="computeroutput"><span class="identifier">t</span></code> |
| of type <code class="computeroutput"><span class="identifier">T</span></code>, |
| and invoke the subject parser <code class="computeroutput"><span class="identifier">a</span></code>, |
| supplying <code class="computeroutput"><span class="identifier">t</span></code> |
| as an attribute. If the subject parser passes, assign <code class="computeroutput"><span class="identifier">t</span></code> to <code class="computeroutput"><span class="identifier">attr</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">as_string</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Equivalent to <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>()[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">as_wstring</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Equivalent to <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span><span class="special">>()[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h7"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.attributes"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.attributes">Attributes</a> |
| </h6> |
| <p> |
| See <a class="link" href="../../quick_reference/compound_attribute_rules.html#spirit.qi.quick_reference.compound_attribute_rules.notation">Compound |
| Attribute Notation</a>. |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Attribute |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">>()[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">a</span><span class="special">:</span> |
| <span class="identifier">A</span> <span class="special">--></span> |
| <span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">>()[</span><span class="identifier">a</span><span class="special">]:</span> |
| <span class="identifier">T</span></code> |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h8"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.complexity"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.complexity">Complexity</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| The complexity is defined by the complexity of the subject parser, |
| <code class="computeroutput"><span class="identifier">a</span></code>, and the complexity |
| of the assignment of the container <code class="computeroutput"><span class="identifier">t</span></code> |
| to the supplied attribute <code class="computeroutput"><span class="identifier">attr</span></code>. |
| </p></blockquote></div> |
| <h6> |
| <a name="spirit.qi.reference.directive.as.h9"></a> |
| <span class="phrase"><a name="spirit.qi.reference.directive.as.example"></a></span><a class="link" href="as.html#spirit.qi.reference.directive.as.example">Example</a> |
| </h6> |
| <div class="note"><table border="0" summary="Note"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| The test harness for the example(s) below is presented in the <a class="link" href="../basics.html#spirit.qi.reference.basics.examples">Basics Examples</a> |
| section. |
| </p></td></tr> |
| </table></div> |
| <p> |
| Some using declarations: |
| </p> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">utree</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">utree_type</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">utf8_symbol_type</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">as</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">as_string</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">char_</span><span class="special">;</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| Simple usage of <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code>, |
| <code class="computeroutput"><span class="identifier">as_string</span></code> and <code class="computeroutput"><span class="identifier">as_wstring</span></code>: |
| </p> |
| <p> |
| To properly handle string concatenation with <a class="link" href="../../../support/utree.html" title="The utree data structure"><code class="computeroutput"><span class="identifier">utree</span></code></a>, we make use of <code class="computeroutput"><span class="identifier">as_string</span><span class="special">[]</span></code>. |
| We also use <code class="computeroutput"><span class="identifier">as</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> |
| to explicitly create a <a class="link" href="../../../support/utree.html" title="The utree data structure"><code class="computeroutput"><span class="identifier">utree</span></code></a> symbol node. |
| </p> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="identifier">utree</span> <span class="identifier">ut</span><span class="special">;</span> |
| |
| <span class="keyword">typedef</span> <span class="identifier">as</span><span class="special"><</span><span class="identifier">utf8_symbol_type</span><span class="special">></span> <span class="identifier">as_symbol_type</span><span class="special">;</span> |
| <span class="identifier">as_symbol_type</span> <span class="keyword">const</span> <span class="identifier">as_symbol</span> <span class="special">=</span> <span class="identifier">as_symbol_type</span><span class="special">();</span> |
| |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"foo"</span><span class="special">,</span> <span class="identifier">as_string</span><span class="special">[*</span><span class="identifier">char_</span><span class="special">],</span> <span class="identifier">ut</span><span class="special">);</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">ut</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// will output >"foo"<</span> |
| <span class="identifier">BOOST_ASSERT</span><span class="special">(</span><span class="identifier">ut</span><span class="special">.</span><span class="identifier">which</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">utree_type</span><span class="special">::</span><span class="identifier">string_type</span><span class="special">);</span> |
| <span class="identifier">ut</span><span class="special">.</span><span class="identifier">clear</span><span class="special">();</span> |
| |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"foo"</span><span class="special">,</span> <span class="identifier">as</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>()[*</span><span class="identifier">char_</span><span class="special">],</span> <span class="identifier">ut</span><span class="special">);</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">ut</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// will output >"foo"<</span> |
| <span class="identifier">BOOST_ASSERT</span><span class="special">(</span><span class="identifier">ut</span><span class="special">.</span><span class="identifier">which</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">utree_type</span><span class="special">::</span><span class="identifier">string_type</span><span class="special">);</span> |
| <span class="identifier">ut</span><span class="special">.</span><span class="identifier">clear</span><span class="special">();</span> |
| |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"foo"</span><span class="special">,</span> <span class="identifier">as_symbol</span><span class="special">[*</span><span class="identifier">char_</span><span class="special">],</span> <span class="identifier">ut</span><span class="special">);</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">ut</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// will output >foo<</span> |
| <span class="identifier">BOOST_ASSERT</span><span class="special">(</span><span class="identifier">ut</span><span class="special">.</span><span class="identifier">which</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">utree_type</span><span class="special">::</span><span class="identifier">symbol_type</span><span class="special">);</span> |
| <span class="identifier">ut</span><span class="special">.</span><span class="identifier">clear</span><span class="special">();</span> |
| |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"foo"</span><span class="special">,</span> <span class="identifier">as</span><span class="special"><</span><span class="identifier">utf8_symbol_type</span><span class="special">>()[*</span><span class="identifier">char_</span><span class="special">],</span> <span class="identifier">ut</span><span class="special">);</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">ut</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// will output >foo<</span> |
| <span class="identifier">BOOST_ASSERT</span><span class="special">(</span><span class="identifier">ut</span><span class="special">.</span><span class="identifier">which</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">utree_type</span><span class="special">::</span><span class="identifier">symbol_type</span><span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2001-2011 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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