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<TITLE>use_facet()</TITLE>
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<H2>use_facet()</H2>
<P><B>Library:</B>&nbsp;&nbsp;<A HREF="2-6.html">Localization</A></P>

<PRE><HR><B><I>Function</I></B><HR></PRE>

<UL>
<LI><A HREF="#sec1">Local Index</A></LI>
<LI><A HREF="#sec2">Summary</A></LI>
<LI><A HREF="#sec3">Synopsis</A></LI>
<LI><A HREF="#sec4">Description</A></LI>
<LI><A HREF="#sec5">Example</A></LI>
<LI><A HREF="#sec6">See Also</A></LI>
<LI><A HREF="#sec7">Standards Conformance</A></LI>
</UL>
<A NAME="sec1"><H3>Local Index</H3></A>
No Entries
<A NAME="sec2"><H3>Summary</H3></A>
<P>A template  function used to obtain a facet from a specific <B><I><A HREF="locale.html">locale</A></I></B> </P>
<A NAME="sec3"><H3>Synopsis</H3></A>

<PRE>#include &lt;locale&gt;

namespace std {
  template&lt;class Facet&gt; const Facet&amp; use_facet(const locale&amp;);
}
</PRE>
<A NAME="sec4"><H3>Description</H3></A>
<P><SAMP>use_facet()</SAMP> returns a reference to the corresponding facet contained in the <SAMP>locale</SAMP> argument. You specify the facet type by explicitly including the template parameter (see the example below). If that facet is not present, then <SAMP>use_facet()</SAMP> throws <B><I><A HREF="bad-cast.html">bad_cast</A></I></B>. Otherwise, the reference remains valid for as long as any copy of the locale exists.</P>
<A NAME="sec5"><H3>Example</H3></A>

<UL><PRE>//
//  usefacet.cpp
//
 
#include &lt;iostream&gt;

int main () {

  std::locale loc;

  // Get a ctype facet
  const std::ctype&lt;char&gt;&amp;
      ct = std::use_facet&lt;std::ctype&lt;char&gt; &gt;(loc); 

  std::cout &lt;&lt; 'a' &lt;&lt; ct.toupper('c') &lt;&lt; std::endl;
 
  return 0;
}


Program Output:
</PRE></UL>
<UL><PRE>aC
</PRE></UL>
<A NAME="sec6"><H3>See Also</H3></A>
<P><B><I><A HREF="locale.html">locale</A></I></B>, <A HREF="facets.html">Facets</A>, <SAMP><A HREF="has-facet.html">has_facet()</A></SAMP></P>
<A NAME="sec7"><H3>Standards Conformance</H3></A>
<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 22.1.1</I></P>

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