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extern/stdcxx/4.2.1/doc/stdlibref/has-facet.html
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extern/stdcxx/4.2.1/doc/stdlibref/has-facet.html
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<HTML>
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<HEAD>
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<TITLE>has_facet()</TITLE>
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<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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<BODY BGCOLOR=#FFFFFF>
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<A HREF="gslice-array.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="heapoperations.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library Reference Guide</B></DIV>
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<H2>has_facet()</H2>
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<P><B>Library:</B> <A HREF="2-6.html">Localization</A></P>
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<PRE><HR><B><I>Function</I></B><HR></PRE>
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<UL>
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<LI><A HREF="#sec1">Local Index</A></LI>
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<LI><A HREF="#sec2">Summary</A></LI>
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<LI><A HREF="#sec3">Synopsis</A></LI>
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<LI><A HREF="#sec4">Description</A></LI>
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<LI><A HREF="#sec5">Example</A></LI>
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<LI><A HREF="#sec6">See Also</A></LI>
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<LI><A HREF="#sec7">Standards Conformance</A></LI>
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</UL>
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<A NAME="sec1"><H3>Local Index</H3></A>
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No Entries
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<A NAME="sec2"><H3>Summary</H3></A>
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<P>A function template used to determine if a locale has a given facet</P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <locale>
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namespace std {
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template <class Facet>
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bool has_facet(const locale&) throw();
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}
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</PRE>
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<A NAME="sec4"><H3>Description</H3></A>
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<P>The function <SAMP>has_facet()</SAMP> returns <SAMP>true</SAMP> if the requested facet is available in the locale. Otherwise, it returns <SAMP>false</SAMP>. You specify the facet type by explicitly including the template parameter (see the example below).</P>
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<A NAME="sec5"><H3>Example</H3></A>
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<UL><PRE>//
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// hasfacet.cpp
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//
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#include <iostream> // for cout, endl
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#include <locale> // for has_facet
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// dummy facet, must derive from locale::facet
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// and define a static member of type locale::id
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struct my_facet: public std::locale::facet
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{
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static std::locale::id id;
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};
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std::locale::id my_facet::id;
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int main ()
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{
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// see if ctype<char> is contained in the locale
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// imbued in cout
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std::cout << std::boolalpha
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<< std::has_facet<std::ctype<char> >(std::cout.getloc ())
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<< std::endl;
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// see if my_facet is contained in the locale
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// imbued in cout
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std::cout << std::has_facet<my_facet>(std::cout.getloc ())
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<< std::endl;
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return 0;
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}
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Program Output:
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</PRE></UL>
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<UL><PRE>false
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false
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</PRE></UL>
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<A NAME="sec6"><H3>See Also</H3></A>
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<P><B><I><A HREF="locale.html">locale</A></I></B>, <A HREF="facets.html">Facets</A>, <SAMP><A HREF="use-facet.html">use_facet()</A></SAMP></P>
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<A NAME="sec7"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 22.1</I></P>
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<BR>
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