.TH "std::locale::id" 3cxx "libstdc++" \" -*- nroff -*-
.ad l
.nh
.SH NAME
std::locale::id \- Facet ID class\&.  

.SH SYNOPSIS
.br
.PP
.PP
\fC#include <locale_classes\&.h>\fP
.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "\fBid\fP ()"
.br
.RI "Constructor\&. "
.ti -1c
.RI "size_t \fB_M_id\fP () \fBconst\fP  \fBthrow\fP ()"
.br
.in -1c
.SS "Friends"

.in +1c
.ti -1c
.RI "template<\fBtypename\fP \fB_Facet\fP > bool \fBhas_facet\fP (\fBconst\fP \fBlocale\fP &)  \fBthrow\fP ()"
.br
.RI "Test for the presence of a facet\&. "
.ti -1c
.RI "\fBclass\fP \fBlocale\fP"
.br
.ti -1c
.RI "\fBclass\fP \fBlocale::_Impl\fP"
.br
.ti -1c
.RI "template<\fBtypename\fP \fB_Facet\fP > \fBconst\fP \fB_Facet\fP & \fBuse_facet\fP (\fBconst\fP \fBlocale\fP &)"
.br
.RI "Return a facet\&. "
.in -1c
.SH "Detailed Description"
.PP 
Facet ID class\&. 

The ID class provides facets with an index used to identify them\&. Every facet class must define a public static member locale::id, or be derived from a facet that provides this member, otherwise the facet cannot be used in a locale\&. The locale::id ensures that each class type gets a unique identifier\&. 
.SH "Constructor & Destructor Documentation"
.PP 
.SS "std::locale::id::id ()\fC [inline]\fP"

.PP
Constructor\&. 
.SH "Friends And Related Symbol Documentation"
.PP 
.SS "template<\fBtypename\fP \fB_Facet\fP > bool has_facet (\fBconst\fP \fBlocale\fP &)\fC [friend]\fP"

.PP
Test for the presence of a facet\&. 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\&.
.PP
\fBTemplate Parameters\fP
.RS 4
\fI_Facet\fP The facet type to test the presence of\&. 
.RE
.PP
\fBParameters\fP
.RS 4
\fI__loc\fP The locale to test\&. 
.RE
.PP
\fBReturns\fP
.RS 4
true if \fC__loc\fP contains a facet of type _Facet, else false\&. 
.RE
.PP

.SS "template<\fBtypename\fP \fB_Facet\fP > \fBconst\fP \fB_Facet\fP & use_facet (\fBconst\fP \fBlocale\fP &)\fC [friend]\fP"

.PP
Return a facet\&. 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 std::bad_cast if the locale doesn't contain a facet of type Facet\&.
.PP
\fBTemplate Parameters\fP
.RS 4
\fI_Facet\fP The facet type to access\&. 
.RE
.PP
\fBParameters\fP
.RS 4
\fI__loc\fP The locale to use\&. 
.RE
.PP
\fBReturns\fP
.RS 4
Reference to facet of type Facet\&. 
.RE
.PP
\fBExceptions\fP
.RS 4
\fIstd::bad_cast\fP if \fC__loc\fP doesn't contain a facet of type _Facet\&. 
.RE
.PP


.SH "Author"
.PP 
Generated automatically by Doxygen for libstdc++ from the source code\&.