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<title>Parser Directives Forcing Atomic Assignment (as<T>, as_string[], as_wstring[])</title>
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<div class="section">
<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><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><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><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><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><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><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>
<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><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><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><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><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>
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