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<title>libstdc++: std::locale::id Class Reference</title>
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<a href="#pub-methods">Public Member Functions</a> |
<a href="#friends">Friends</a> </div>
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<div class="title">std::locale::id Class Reference<div class="ingroups"><a class="el" href="a01190.html">Locales</a></div></div> </div>
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<!-- doxytag: class="std::locale::id" -->
<p>Facet ID class.The ID class provides facets with an index used to identify them. Every facet class must define a public static member <a class="el" href="a00583.html" title="Facet ID class.The ID class provides facets with an index used to identify them. Every facet class mu...">locale::id</a>, or be derived from a facet that provides this member, otherwise the facet cannot be used in a locale. The <a class="el" href="a00583.html" title="Facet ID class.The ID class provides facets with an index used to identify them. Every facet class mu...">locale::id</a> ensures that each class type gets a unique identifier.
<a href="a00583.html#details">More...</a></p>
<p><a href="a02207.html">List of all members.</a></p>
<h2><a name="pub-methods"></a>
Public Member Functions</h2>
<ul>
<li><a class="el" href="a00583.html#a05733d8d1ad35f4fa4feef3313b1bce3">id</a> ()
<li><a class="anchor" id="af1c4c319debe9b1a90e219f0f6c446f2"></a><!-- doxytag: member="std::locale::id::_M_id" ref="af1c4c319debe9b1a90e219f0f6c446f2" args="() const " -->
size_t <b>_M_id</b> () const throw ()
</ul>
<h2><a name="friends"></a>
Friends</h2>
<ul>
<li>template<typename _Facet > bool <a class="el" href="a00583.html#ae49220e9bc66bb10e1ca224ad30ced8e">has_facet</a> (const <a class="el" href="a00581.html">locale</a> &) throw ()
<li><a class="anchor" id="a0a09223e17db306b813d8b07b4b344fc"></a><!-- doxytag: member="std::locale::id::locale" ref="a0a09223e17db306b813d8b07b4b344fc" args="" -->
class <b>locale</b>
<li><a class="anchor" id="ad6cc86eddbc65fb7e6d6d09b2c42d697"></a><!-- doxytag: member="std::locale::id::locale::_Impl" ref="ad6cc86eddbc65fb7e6d6d09b2c42d697" args="" -->
class <b>locale::_Impl</b>
<li>template<typename _Facet > const _Facet & <a class="el" href="a00583.html#ab3e92cb07fc76f241463323e6beb5bef">use_facet</a> (const <a class="el" href="a00581.html">locale</a> &)
</ul>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Facet ID class.</p>
<p>The ID class provides facets with an index used to identify them. Every facet class must define a public static member <a class="el" href="a00583.html" title="Facet ID class.The ID class provides facets with an index used to identify them. Every facet class mu...">locale::id</a>, or be derived from a facet that provides this member, otherwise the facet cannot be used in a locale. The <a class="el" href="a00583.html" title="Facet ID class.The ID class provides facets with an index used to identify them. Every facet class mu...">locale::id</a> ensures that each class type gets a unique identifier. </p>
<p>Definition at line <a class="el" href="a00926_source.html#l00437">437</a> of file <a class="el" href="a00926_source.html">locale_classes.h</a>.</p>
</div><hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="a05733d8d1ad35f4fa4feef3313b1bce3"></a><!-- doxytag: member="std::locale::id::id" ref="a05733d8d1ad35f4fa4feef3313b1bce3" args="()" -->
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<td class="memname">std::locale::id::id </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td><code> [inline]</code></td>
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<p>Constructor. </p>
<p>Definition at line <a class="el" href="a00926_source.html#l00468">468</a> of file <a class="el" href="a00926_source.html">locale_classes.h</a>.</p>
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<hr/><h2>Friends And Related Function Documentation</h2>
<a class="anchor" id="ae49220e9bc66bb10e1ca224ad30ced8e"></a><!-- doxytag: member="std::locale::id::has_facet" ref="ae49220e9bc66bb10e1ca224ad30ced8e" args="(const locale &)" -->
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template<typename _Facet > </div>
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<td class="memname">bool has_facet </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="a00581.html">locale</a> & </td>
<td class="paramname"></td><td>)</td>
<td> throw ()<code> [friend]</code></td>
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<p>Test for the presence of a facet. </p>
<p>has_facet tests the locale argument for the presence of the facet type provided as the template parameter. Facets derived from the facet parameter will also return true.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">Facet</td><td>The facet type to test the presence of. </td></tr>
<tr><td class="paramname">locale</td><td>The locale to test. </td></tr>
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</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>true if locale contains a facet of type Facet, else false. </dd></dl>
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<a class="anchor" id="ab3e92cb07fc76f241463323e6beb5bef"></a><!-- doxytag: member="std::locale::id::use_facet" ref="ab3e92cb07fc76f241463323e6beb5bef" args="(const locale &)" -->
<div class="memitem">
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template<typename _Facet > </div>
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<td class="memname">const _Facet& use_facet </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="a00581.html">locale</a> & </td>
<td class="paramname"></td><td>)</td>
<td><code> [friend]</code></td>
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<p>Return a facet. </p>
<p>use_facet looks for and returns a reference to a facet of type Facet where Facet is the template parameter. If has_facet(locale) is true, there is a suitable facet to return. It throws <a class="el" href="a00390.html" title="Thrown during incorrect typecasting.If you attempt an invalid dynamic_cast expression, an instance of this class (or something derived from this class) is thrown.">std::bad_cast</a> if the locale doesn't contain a facet of type Facet.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">Facet</td><td>The facet type to access. </td></tr>
<tr><td class="paramname">locale</td><td>The locale to use. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Reference to facet of type Facet. </dd></dl>
<dl><dt><b>Exceptions:</b></dt><dd>
<table class="exception">
<tr><td class="paramname"><a class="el" href="a00390.html" title="Thrown during incorrect typecasting.If you attempt an invalid dynamic_cast expression, an instance of this class (or something derived from this class) is thrown.">std::bad_cast</a></td><td>if locale doesn't contain a facet of type Facet. </td></tr>
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</dd>
</dl>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="a00926_source.html">locale_classes.h</a></li>
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