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<a href="#pub-static-methods">Static Public Member Functions</a> </div>
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<div class="title">Wt::boost_any_traits< Type > Struct Template Reference<div class="ingroups"><a class="el" href="group__modelview.html">Model/view system</a></div></div> </div>
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<!-- doxytag: class="Wt::boost_any_traits" -->
<p>A traits class for a type stored in a boost::any.
<a href="structWt_1_1boost__any__traits.html#details">More...</a></p>
<p><a href="structWt_1_1boost__any__traits-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classWt_1_1WString.html">WString</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1boost__any__traits.html#aa9746e57608889b491fe29a22b0a77e6">asString</a> (const Type &value, const <a class="el" href="classWt_1_1WString.html">WString</a> &format)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Converts a value to a string. <a href="#aa9746e57608889b491fe29a22b0a77e6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1boost__any__traits.html#ae64c24bc95485379a81410eb025f376e">asNumber</a> (const Type &v)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Converts a value to a number. <a href="#ae64c24bc95485379a81410eb025f376e"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static int </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1boost__any__traits.html#ad8c7fbf1e2c414828a595eea76d7bf00">compare</a> (const Type &v1, const Type &v2)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Compares two values. <a href="#ad8c7fbf1e2c414828a595eea76d7bf00"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><h3>template<typename Type><br/>
struct Wt::boost_any_traits< Type ></h3>
<p>A traits class for a type stored in a boost::any. </p>
<p>The traits are used by Wt's view classes (such as <a class="el" href="classWt_1_1WTableView.html" title="An MVC View widget for tabular data.">Wt::WTableView</a> <a class="el" href="classWt_1_1WTreeView.html" title="A view class that displays a model as a tree or tree table.">Wt::WTreeView</a>, <a class="el" href="classWt_1_1Chart_1_1WCartesianChart.html" title="A cartesian chart.">Wt::Chart::WCartesianChart</a>) to deal with values in a <a class="el" href="classWt_1_1WAbstractItemModel.html" title="An abstract model for use with Wt's view classes.">Wt::WAbstractItemModel</a>:</p>
<ul>
<li>conversion to a string by <a class="el" href="group__modelview.html#ga57b5cadd177847f51eaeb0cee23782c1" title="Interprets a boost::any as a string value.">Wt::asString()</a></li>
<li>conversion to a number by <a class="el" href="group__modelview.html#ga2494f8093b2b8f2f9c0aa7699e7bfc2a" title="Interprets a boost::any as a number value.">Wt::asNumber()</a></li>
<li>sorting by <a class="el" href="classWt_1_1WSortFilterProxyModel.html" title="A proxy model for Wt's item models that provides filtering and/or sorting.">Wt::WSortFilterProxyModel</a> or <a class="el" href="classWt_1_1WStandardItemModel.html" title="A standard data model, which stores its data in memory.">WStandardItemModel</a>.</li>
</ul>
<p>This traits class provides a default implementation for supporting values <em>value</em> of a custom type <em>Type</em> in Wt's MVC system, which relies on:</p>
<ul>
<li>serializing to a stream (std::ostream << <em>value</em>) for converting the value to a string.</li>
<li>lexical interpretation as a number for converting the value to a number, using boost::lexical_cast<double>(value).</li>
<li>sorting using operator== and operator<</li>
</ul>
<p>You can specialize these traits if you need to customize one or more of these operations. </p>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="ae64c24bc95485379a81410eb025f376e"></a><!-- doxytag: member="Wt::boost_any_traits::asNumber" ref="ae64c24bc95485379a81410eb025f376e" args="(const Type &v)" -->
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template<typename Type > </div>
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<td class="memname">double <a class="el" href="structWt_1_1boost__any__traits.html">Wt::boost_any_traits</a>< Type >::asNumber </td>
<td>(</td>
<td class="paramtype">const Type & </td>
<td class="paramname"><em>v</em></td><td>)</td>
<td><code> [static]</code></td>
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<p>Converts a value to a number. </p>
<p>The default implementation returns: </p>
<div class="fragment"><pre class="fragment"> boost::lexical_cast<<span class="keywordtype">double</span>>(<a class="code" href="structWt_1_1boost__any__traits.html#aa9746e57608889b491fe29a22b0a77e6" title="Converts a value to a string.">asString</a>(v), <span class="stringliteral">""</span>)
</pre></div>
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<a class="anchor" id="aa9746e57608889b491fe29a22b0a77e6"></a><!-- doxytag: member="Wt::boost_any_traits::asString" ref="aa9746e57608889b491fe29a22b0a77e6" args="(const Type &value, const WString &format)" -->
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template<typename Type > </div>
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<td class="memname"><a class="el" href="classWt_1_1WString.html">WString</a> <a class="el" href="structWt_1_1boost__any__traits.html">Wt::boost_any_traits</a>< Type >::asString </td>
<td>(</td>
<td class="paramtype">const Type & </td>
<td class="paramname"><em>value</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="classWt_1_1WString.html">WString</a> & </td>
<td class="paramname"><em>format</em> </td>
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<td>)</td>
<td></td><td><code> [static]</code></td>
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<p>Converts a value to a string. </p>
<p>The default implementation uses a boost::lexical_cast, and thus an overloaded std::ostream<< operator for the value. </p>
</div>
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<a class="anchor" id="ad8c7fbf1e2c414828a595eea76d7bf00"></a><!-- doxytag: member="Wt::boost_any_traits::compare" ref="ad8c7fbf1e2c414828a595eea76d7bf00" args="(const Type &v1, const Type &v2)" -->
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template<typename Type > </div>
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<td class="memname">int <a class="el" href="structWt_1_1boost__any__traits.html">Wt::boost_any_traits</a>< Type >::compare </td>
<td>(</td>
<td class="paramtype">const Type & </td>
<td class="paramname"><em>v1</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const Type & </td>
<td class="paramname"><em>v2</em> </td>
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<td></td>
<td>)</td>
<td></td><td><code> [static]</code></td>
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<div class="memdoc">
<p>Compares two values. </p>
<p>The default implementation uses operator== and operator<. </p>
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