std::locale::id(3)

NAME
std::locale::id - Facet ID class.

SYNOPSIS

  Public Member Functions
size_t _M_id () const
id ()

  Friends
template<typename _Facet > bool has_facet (const locale &) throw ()
class locale
class locale::_Impl
template<typename _Facet > const _Facet & use_facet (const locale &)

Detailed Description

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.

Definition at line 431 of file locale_classes.h.

Constructor & Destructor Documentation

  std::locale::locale::id::id () [inline]

Constructor.

Definition at line 462 of file locale_classes.h.

Friends And Related Function Documentation

  template<typename _Facet > bool has_facet (const locale &) throw () [friend]

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.

Parameters:
    Facet The facet type to test the presence of.
    locale The locale to test.

Returns:
    true if locale contains a facet of type Facet, else false.

  template<typename _Facet > const _Facet& use_facet (const locale &) [friend]

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.

Parameters:
    Facet The facet type to access.
    locale The locale to use.

Returns:
    Reference to facet of type Facet.

Exceptions:
    std::bad_cast if locale doesn't contain a facet of type Facet.

Author

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