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| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="spirit.advanced.customize.is_container"></a><a class="link" href="is_container.html" title="Determine if a Type Should be Treated as a Container (Qi and Karma)">Determine if |
| a Type Should be Treated as a Container (Qi and Karma)</a> |
| </h4></div></div></div> |
| <a name="spirit.advanced.customize.is_container.is_container"></a><h6> |
| <a name="id1160173"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.is_container">is_container</a> |
| </h6> |
| <p> |
| The template <code class="computeroutput"><span class="identifier">is_container</span></code> |
| is a template meta-function used as an attribute customization point. It |
| is invoked by the <span class="emphasis"><em>Qi</em></span> <a class="link" href="../../qi/reference/operator/sequence.html" title="Sequence (a >> b)">Sequence</a> |
| (<code class="computeroutput"><span class="special">>></span></code>) and <span class="emphasis"><em>Karma</em></span> |
| <a class="link" href="../../karma/reference/operator/sequence.html" title="Sequences (a << b)">Sequence (<code class="computeroutput"><span class="special"><<</span></code>)</a> operators in order to determine |
| whether a supplied attribute can potentially be treated as a container. |
| </p> |
| <a name="spirit.advanced.customize.is_container.header"></a><h6> |
| <a name="id1160228"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.header">Header</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.is_container.namespace"></a><h6> |
| <a name="id1160335"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.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.is_container.synopsis"></a><h6> |
| <a name="id1160408"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.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">Enable</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">is_container</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> <span class="special"><</span><span class="identifier">unspecified</span><span class="special">></span> <span class="identifier">type</span><span class="special">;</span> |
| <span class="special">};</span> |
| </pre> |
| <a name="spirit.advanced.customize.is_container.template_parameters"></a><h6> |
| <a name="id1160507"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.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> |
| which 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">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">is_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.is_container.notation"></a><h6> |
| <a name="id1160680"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.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 tested whether it needs to be treated as a container. |
| </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.is_container.expression_semantics"></a><h6> |
| <a name="id1160748"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.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> |
| <code class="computeroutput"><span class="identifier">is_container</span><span class="special"><</span><span class="identifier">C</span><span class="special">>::</span><span class="identifier">type</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Result of the metafunction that evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code> |
| if a given type, <code class="computeroutput"><span class="identifier">C</span></code>, |
| is to be treated as a container, <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.advanced.customize.is_container.predefined_specializations"></a><h6> |
| <a name="id1160880"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.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 conditions for which the corresponding specializations |
| will evaluate to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code> (see <a href="../../../../../../../libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL |
| Boolean Constant</a>): |
| </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">T</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code> if <code class="computeroutput"><span class="identifier">T</span></code> |
| has the following embedded types defined: <code class="computeroutput"><span class="identifier">value_type</span></code>, |
| <code class="computeroutput"><span class="identifier">iterator</span></code>, <code class="computeroutput"><span class="identifier">size_type</span></code>, and<code class="computeroutput"><span class="identifier">reference</span></code>. Otherwise it will |
| return <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</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">T</span><span class="special">></span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns <code class="computeroutput"><span class="identifier">is_container</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span></code> |
| </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> |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code> if at least one of the |
| <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> |
| returns <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code> (where <code class="computeroutput"><span class="identifier">TN</span></code> is <code class="computeroutput"><span class="identifier">T1</span></code>, |
| <code class="computeroutput"><span class="identifier">T2</span></code>, ...). Otherwise |
| it will return <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">unused_type</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></code>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.advanced.customize.is_container.when_to_implement"></a><h6> |
| <a name="id1161299"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.when_to_implement">When |
| to implement</a> |
| </h6> |
| <p> |
| The customization point <code class="computeroutput"><span class="identifier">is_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>) and generators (<span class="emphasis"><em>Spirit.Karma</em></span>). |
| As a rule of thumb: it has to be implemented whenever a certain type is |
| to be passed as an attribute to a parser or a generator normally exposing |
| a STL container, <code class="computeroutput"><span class="identifier">C</span></code> and |
| if the type does not expose the interface of a STL container (i.e. <code class="computeroutput"><span class="identifier">is_container</span><span class="special"><</span><span class="identifier">C</span><span class="special">>::</span><span class="identifier">type</span></code> would normally return <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</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.is_container.related_attribute_customization_points"></a><h6> |
| <a name="id1161457"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.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="store_value/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> |
| Needs to be implemented whenever <code class="computeroutput"><span class="identifier">is_container</span></code> |
| is implemented. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="store_value/push_back.html" title="Store a Parsed Attribute Value into a Container (Qi)"><code class="computeroutput"><span class="identifier">push_back_container</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="iterate/container_iterator.html" title="Determine the Type of the Iterator of a Container (Karma)"><code class="computeroutput"><span class="identifier">container_iterator</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Karma: <a class="link" href="../../karma/reference/operator/list.html" title="Lists (a % b)">List |
| (<code class="computeroutput"><span class="special">%</span></code>)</a>, <a class="link" href="../../karma/reference/operator/kleene.html" title="Kleene Star (*a)">Kleene (unary |
| <code class="computeroutput"><span class="special">*</span></code>)</a>, <a class="link" href="../../karma/reference/operator/plus.html" title="Plus (+a)">Plus (unary <code class="computeroutput"><span class="special">+</span></code>)</a>, <a class="link" href="../../karma/reference/directive/repeat.html" title="Repetition Directive (repeat[])">Repeat</a>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="iterate/begin_container.html" title="Get the Iterator pointing to the Begin of a Container Attribute"><code class="computeroutput"><span class="identifier">begin_container</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Karma: <a class="link" href="../../karma/reference/operator/list.html" title="Lists (a % b)">List |
| (<code class="computeroutput"><span class="special">%</span></code>)</a>, <a class="link" href="../../karma/reference/operator/kleene.html" title="Kleene Star (*a)">Kleene (unary |
| <code class="computeroutput"><span class="special">*</span></code>)</a>, <a class="link" href="../../karma/reference/operator/plus.html" title="Plus (+a)">Plus (unary <code class="computeroutput"><span class="special">+</span></code>)</a>, <a class="link" href="../../karma/reference/directive/repeat.html" title="Repetition Directive (repeat[])">Repeat</a>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="iterate/end_container.html" title="Get the Iterator pointing to the End of a Container Attribute"><code class="computeroutput"><span class="identifier">end_container</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Karma: <a class="link" href="../../karma/reference/operator/list.html" title="Lists (a % b)">List |
| (<code class="computeroutput"><span class="special">%</span></code>)</a>, <a class="link" href="../../karma/reference/operator/kleene.html" title="Kleene Star (*a)">Kleene (unary |
| <code class="computeroutput"><span class="special">*</span></code>)</a>, <a class="link" href="../../karma/reference/operator/plus.html" title="Plus (+a)">Plus (unary <code class="computeroutput"><span class="special">+</span></code>)</a>, <a class="link" href="../../karma/reference/directive/repeat.html" title="Repetition Directive (repeat[])">Repeat</a>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="iterate/deref_iterator.html" title="Dereference the Iterator pointing into a Container Attribute"><code class="computeroutput"><span class="identifier">deref_iterator</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Karma: <a class="link" href="../../karma/reference/operator/list.html" title="Lists (a % b)">List |
| (<code class="computeroutput"><span class="special">%</span></code>)</a>, <a class="link" href="../../karma/reference/operator/kleene.html" title="Kleene Star (*a)">Kleene (unary |
| <code class="computeroutput"><span class="special">*</span></code>)</a>, <a class="link" href="../../karma/reference/operator/plus.html" title="Plus (+a)">Plus (unary <code class="computeroutput"><span class="special">+</span></code>)</a>, <a class="link" href="../../karma/reference/directive/repeat.html" title="Repetition Directive (repeat[])">Repeat</a>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="iterate/next_iterator.html" title="Increment the Iterator pointing into a Container Attribute"><code class="computeroutput"><span class="identifier">next_iterator</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Karma: <a class="link" href="../../karma/reference/operator/list.html" title="Lists (a % b)">List |
| (<code class="computeroutput"><span class="special">%</span></code>)</a>, <a class="link" href="../../karma/reference/operator/kleene.html" title="Kleene Star (*a)">Kleene (unary |
| <code class="computeroutput"><span class="special">*</span></code>)</a>, <a class="link" href="../../karma/reference/operator/plus.html" title="Plus (+a)">Plus (unary <code class="computeroutput"><span class="special">+</span></code>)</a>, <a class="link" href="../../karma/reference/directive/repeat.html" title="Repetition Directive (repeat[])">Repeat</a>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="iterate/compare_iterators.html" title="Compare two Iterator pointing into a Container Attribute for Equality"><code class="computeroutput"><span class="identifier">compare_iterators</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Karma: <a class="link" href="../../karma/reference/operator/list.html" title="Lists (a % b)">List |
| (<code class="computeroutput"><span class="special">%</span></code>)</a>, <a class="link" href="../../karma/reference/operator/kleene.html" title="Kleene Star (*a)">Kleene (unary |
| <code class="computeroutput"><span class="special">*</span></code>)</a>, <a class="link" href="../../karma/reference/operator/plus.html" title="Plus (+a)">Plus (unary <code class="computeroutput"><span class="special">+</span></code>)</a>, <a class="link" href="../../karma/reference/directive/repeat.html" title="Repetition Directive (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.is_container.example"></a><h6> |
| <a name="id1162049"></a> |
| <a class="link" href="is_container.html#spirit.advanced.customize.is_container.example">Example</a> |
| </h6> |
| <p> |
| For examples of how to use the customization point <code class="computeroutput"><span class="identifier">is_container</span></code> |
| please see here: <a class="link" href="iterate/container_iterator.html#spirit.advanced.customize.iterate.container_iterator.example">embedded_container_example</a>, |
| <a class="link" href="iterate/next_iterator.html#spirit.advanced.customize.iterate.next_iterator.example">use_as_container</a>, |
| and <a class="link" href="iterate/deref_iterator.html#spirit.advanced.customize.iterate.deref_iterator.example">counter_example</a>. |
| </p> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <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> |
| </tr></table> |
| <hr> |
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