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| <TITLE>has_facet()</TITLE> |
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| <H2>has_facet()</H2> |
| <P><B>Library:</B> <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 function template used to determine if a locale has a given facet</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <locale> |
| |
| namespace std { |
| template <class Facet> |
| bool has_facet(const locale&) throw(); |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <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> |
| <A NAME="sec5"><H3>Example</H3></A> |
| |
| <UL><PRE>// |
| // hasfacet.cpp |
| // |
| |
| #include <iostream> // for cout, endl |
| #include <locale> // for has_facet |
| |
| |
| |
| // dummy facet, must derive from locale::facet |
| // and define a static member of type locale::id |
| struct my_facet: public std::locale::facet |
| { |
| static std::locale::id id; |
| }; |
| |
| std::locale::id my_facet::id; |
| |
| |
| int main () |
| { |
| // see if ctype<char> is contained in the locale |
| // imbued in cout |
| std::cout << std::boolalpha |
| << std::has_facet<std::ctype<char> >(std::cout.getloc ()) |
| << std::endl; |
| |
| // see if my_facet is contained in the locale |
| // imbued in cout |
| std::cout << std::has_facet<my_facet>(std::cout.getloc ()) |
| << std::endl; |
| |
| return 0; |
| } |
| |
| |
| Program Output: |
| </PRE></UL> |
| <UL><PRE>false |
| false |
| </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="use-facet.html">use_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</I></P> |
| |
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