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| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.advanced.customize.store_value.push_back"></a><a class="link" href="push_back.html" title="Store a Parsed Attribute Value into a Container (Qi)">Store |
| a Parsed Attribute Value into a Container (Qi)</a> |
| </h5></div></div></div> |
| <a name="spirit.advanced.customize.store_value.push_back.push_back_container"></a><h6> |
| <a name="id1172176"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.push_back_container">push_back_container</a> |
| </h6> |
| <p> |
| The template <code class="computeroutput"><span class="identifier">push_back_container</span></code> |
| is a type used as an attribute customization point. It is invoked by |
| the <span class="emphasis"><em>Qi</em></span> repetitive parsers (<a class="link" href="../../../qi/reference/operator/kleene.html" title="Kleene (*a)">Kleene</a>, |
| <a class="link" href="../../../qi/reference/operator/plus.html" title="Plus (+a)">Plus</a>, <a class="link" href="../../../qi/reference/operator/list.html" title="List (a % b)">List</a>, and <a class="link" href="../../../qi/reference/directive/repeat.html" title="Repetition (repeat[])">Repeat</a>) |
| to store a parsed attribute value into a container. |
| </p> |
| <a name="spirit.advanced.customize.store_value.push_back.module_headers"></a><h6> |
| <a name="id1172225"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.module_headers">Module |
| Headers</a> |
| </h6> |
| <pre class="programlisting"><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">home</span><span class="special">/</span><span class="identifier">support</span><span class="special">/</span><span class="identifier">container</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> |
| <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> |
| This header file does not need to be included directly by any user |
| program as it is normally included by other Spirit header files relying |
| on its content. |
| </p></td></tr> |
| </table></div> |
| <a name="spirit.advanced.customize.store_value.push_back.namespace"></a><h6> |
| <a name="id1172315"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.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">traits</span></code> |
| </p> |
| </td></tr></tbody> |
| </table></div> |
| <a name="spirit.advanced.customize.store_value.push_back.synopsis"></a><h6> |
| <a name="id1172393"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.synopsis">Synopsis</a> |
| </h6> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Container</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attrib</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Enable</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">push_back_container</span> |
| <span class="special">{</span> |
| <span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">call</span><span class="special">(</span><span class="identifier">Container</span><span class="special">&</span> <span class="identifier">c</span><span class="special">,</span> <span class="identifier">Attrib</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">val</span><span class="special">);</span> |
| <span class="special">};</span> |
| </pre> |
| <a name="spirit.advanced.customize.store_value.push_back.template_parameters"></a><h6> |
| <a name="id1172534"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.template_parameters">Template |
| parameters</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <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">Container</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The type, <code class="computeroutput"><span class="identifier">Container</span></code> |
| needs to be tested whether it has to be treated as a container |
| </p> |
| </td> |
| <td> |
| <p> |
| none |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Attrib</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The type, <code class="computeroutput"><span class="identifier">Attrib</span></code> |
| is the one returned from the customization point <a class="link" href="container_value.html" title="Determine the Type to be Stored in a Container (Qi)"><code class="computeroutput"><span class="identifier">container_value</span></code></a> and |
| represents the attribute value to be stored in the container |
| of type <code class="computeroutput"><span class="identifier">Container</span></code>. |
| </p> |
| </td> |
| <td> |
| <p> |
| none |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Enable</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Helper template parameter usable to selectively enable or disable |
| certain specializations of <code class="computeroutput"><span class="identifier">push_back_container</span></code> |
| utilizing SFINAE (i.e. <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_if</span></code> |
| or <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">disable_if</span></code>). |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">void</span></code> |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.advanced.customize.store_value.push_back.notation"></a><h6> |
| <a name="id1172764"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.notation">Notation</a> |
| </h6> |
| <div class="variablelist"> |
| <p class="title"><b></b></p> |
| <dl> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">C</span></code></span></dt> |
| <dd><p> |
| A type to be used as a container to store attribute values in. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">c</span></code></span></dt> |
| <dd> |
| <p> |
| A container instance of type <code class="computeroutput"><span class="identifier">C</span></code>. |
| </p> |
| <p> |
| [<code class="computeroutput"><span class="identifier">Attrib</span></code> |
| </p> |
| <p> |
| A type to be used as a container to store attribute values in. |
| </p> |
| </dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">attr</span></code></span></dt> |
| <dd><p> |
| A attribute instance of type <code class="computeroutput"><span class="identifier">Attrib</span></code>. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">T1</span></code>, <code class="computeroutput"><span class="identifier">T2</span></code>, ...</span></dt> |
| <dd><p> |
| Arbitrary types |
| </p></dd> |
| </dl> |
| </div> |
| <a name="spirit.advanced.customize.store_value.push_back.expression_semantics"></a><h6> |
| <a name="id1172899"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.expression_semantics">Expression |
| Semantics</a> |
| </h6> |
| <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> |
| |
| </p> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">push_back_container</span><span class="special"><</span><span class="identifier">C</span><span class="special">,</span> <span class="identifier">Attrib</span><span class="special">>::</span><span class="identifier">call</span><span class="special">(</span><span class="identifier">c</span><span class="special">,</span> <span class="identifier">attr</span><span class="special">)</span></pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| <p> |
| Static function that is invoked whenever an attribute value, |
| <code class="computeroutput"><span class="identifier">attr</span></code> needs |
| to be stored into the container instance <code class="computeroutput"><span class="identifier">c</span></code>. |
| This function should return <code class="computeroutput"><span class="keyword">true</span></code> |
| on success and <code class="computeroutput"><span class="keyword">false</span></code> |
| otherwise. Returning <code class="computeroutput"><span class="keyword">false</span></code> |
| causes the corresponding parser to fail. |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <a name="spirit.advanced.customize.store_value.push_back.predefined_specializations"></a><h6> |
| <a name="id1173050"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.predefined_specializations">Predefined |
| Specializations</a> |
| </h6> |
| <p> |
| <a href="http://boost-spirit.com" target="_top">Spirit</a> predefines specializations |
| of this customization point for several types. The following table lists |
| those types together with the types exposed and the corresponding semantics: |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Template Parameters |
| </p> |
| </th> |
| <th> |
| <p> |
| Value |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">C</span></code>, <code class="computeroutput"><span class="identifier">Attrib</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Store the provided attribute instance <code class="computeroutput"><span class="identifier">attr</span></code> |
| into the given container <code class="computeroutput"><span class="identifier">c</span></code> |
| using the function call <code class="computeroutput"><span class="identifier">c</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">attr</span><span class="special">)</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">C</span><span class="special">></span></code>, |
| <code class="computeroutput"><span class="identifier">Attrib</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| If the provided instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><></span></code> is not initialized, |
| invoke the appropriate initialization and afterwards apply |
| the customization point <code class="computeroutput"><span class="identifier">push_back_container</span><span class="special"><</span><span class="identifier">C</span><span class="special">,</span> <span class="identifier">Attrib</span><span class="special">></span></code>, treating the instance |
| held by the optional (of type <code class="computeroutput"><span class="identifier">C</span></code>) |
| as the container to store the attribute in. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">variant</span><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> |
| <span class="identifier">T2</span><span class="special">,</span> |
| <span class="special">...></span></code>, <code class="computeroutput"><span class="identifier">Attrib</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| If the instance of the variant currently holds a value with |
| a type, <code class="computeroutput"><span class="identifier">TN</span></code>, |
| for which <code class="computeroutput"><span class="identifier">is_container</span><span class="special"><</span><span class="identifier">TN</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>, |
| this customization point specialization will apply <code class="computeroutput"><span class="identifier">push_back_container</span><span class="special"><</span><span class="identifier">TN</span><span class="special">,</span> |
| <span class="identifier">Attrib</span><span class="special">></span></code>, |
| treating the instance held by the variant (of type <code class="computeroutput"><span class="identifier">TN</span></code>) as the container to store |
| the attribute in. Otherwise it will raise an assertion. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">unused_type</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Do nothing. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.advanced.customize.store_value.push_back.when_to_implement"></a><h6> |
| <a name="id1174148"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.when_to_implement">When |
| to Implement</a> |
| </h6> |
| <p> |
| The customization point <code class="computeroutput"><span class="identifier">push_back_container</span></code> |
| needs to be implemented for a specific type whenever this type is to |
| be used as an attribute in place of a STL container. It is applicable |
| for parsers (<span class="emphasis"><em>Spirit.Qi</em></span>) only. As a rule of thumb: |
| it has to be implemented whenever a certain type is to be passed as an |
| attribute to a parser normally exposing a STL container and if the type |
| does not expose the interface of a STL container (i.e. no function being |
| equivalent to <code class="computeroutput"><span class="identifier">c</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">attr</span><span class="special">)</span></code>. |
| These components have an attribute propagation rule in the form: |
| </p> |
| <pre class="programlisting"><span class="identifier">a</span><span class="special">:</span> <span class="identifier">A</span> <span class="special">--></span> <span class="identifier">Op</span><span class="special">(</span><span class="identifier">a</span><span class="special">):</span> <span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span> |
| </pre> |
| <p> |
| where <code class="computeroutput"><span class="identifier">Op</span><span class="special">(</span><span class="identifier">a</span><span class="special">)</span></code> |
| stands for any meaningful operation on the component <code class="computeroutput"><span class="identifier">a</span></code>. |
| </p> |
| <a name="spirit.advanced.customize.store_value.push_back.related_attribute_customization_points"></a><h6> |
| <a name="id1174298"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.related_attribute_customization_points">Related |
| Attribute Customization Points</a> |
| </h6> |
| <p> |
| If this customization point is implemented, the following other customization |
| points might need to be implemented as well. |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Name |
| </p> |
| </th> |
| <th> |
| <p> |
| When to implement |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="container_value.html" title="Determine the Type to be Stored in a Container (Qi)"><code class="computeroutput"><span class="identifier">container_value</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Qi: <a class="link" href="../../../qi/reference/operator/list.html" title="List (a % b)">List</a>, |
| <a class="link" href="../../../qi/reference/operator/kleene.html" title="Kleene (*a)">Kleene</a>, |
| <a class="link" href="../../../qi/reference/operator/plus.html" title="Plus (+a)">Plus</a>, |
| <a class="link" href="../../../qi/reference/directive/repeat.html" title="Repetition (repeat[])">Repeat</a>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="../clear_value.html" title="Re-Initialize an Attribute Value before Parsing (Qi)"><code class="computeroutput"><span class="identifier">clear_value</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Qi: <a class="link" href="../../../qi/reference/operator/list.html" title="List (a % b)">List</a>, |
| <a class="link" href="../../../qi/reference/operator/kleene.html" title="Kleene (*a)">Kleene</a>, |
| <a class="link" href="../../../qi/reference/operator/plus.html" title="Plus (+a)">Plus</a>, |
| <a class="link" href="../../../qi/reference/directive/repeat.html" title="Repetition (repeat[])">Repeat</a>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.advanced.customize.store_value.push_back.example"></a><h6> |
| <a name="id1174444"></a> |
| <a class="link" href="push_back.html#spirit.advanced.customize.store_value.push_back.example">Example</a> |
| </h6> |
| <p> |
| Here is an example showing the default implementation of the <a class="link" href="container_value.html" title="Determine the Type to be Stored in a Container (Qi)"><code class="computeroutput"><span class="identifier">container_value</span></code></a> customization |
| point provided by the library: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Container</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Enable</span><span class="comment">/* = void*/</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">push_back_container</span> |
| <span class="special">{</span> |
| <span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">call</span><span class="special">(</span><span class="identifier">Container</span><span class="special">&</span> <span class="identifier">c</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">val</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">c</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">val</span><span class="special">);</span> |
| <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> |
| <span class="special">}</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| This template is instantiated by the library at the appropriate places |
| while using the supplied container and element types as the template |
| arguments. The member function <code class="computeroutput"><span class="identifier">call</span><span class="special">()</span></code> will be called whenever an element |
| has to be added to the supplied container |
| </p> |
| <p> |
| The following example shows the predefined specialization for <code class="computeroutput"><span class="identifier">unused_type</span></code>: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Container</span><span class="special">></span> |
| <span class="keyword">bool</span> <span class="identifier">push_back</span><span class="special">(</span><span class="identifier">Container</span><span class="special">&,</span> <span class="identifier">unused_type</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| which defines an empty member function <code class="computeroutput"><span class="identifier">call</span><span class="special">()</span></code>. |
| </p> |
| <p> |
| More examples: TBD |
| </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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