Defined in header <locale> | ||
---|---|---|
class locale::id; |
The class std::locale::id
provides implementation-specific identification of a locale facet. Each class derived from std::locale::facet
must have a public static member of type std::locale::id
and each std::locale
object maintains a list of facets it implements, indexed by their id
s.
Facets with the same id
belong to the same facet category and replace each other when added to a locale object.
Member functions
constructs a new id (public member function) | |
operator= | copy assignment operator is deleted (public member function) |
Example
The following example shows how to construct a minimal custom facet.
#include <iostream> #include <locale> struct myfacet : std::locale::facet { myfacet(std::size_t refs = 0) : facet(refs) {} static std::locale::id id; }; std::locale::id myfacet::id; int main() { std::locale myloc(std::locale(), new myfacet); std::cout << "has_facet<myfacet>(myloc) returns " << std::boolalpha << std::has_facet<myfacet>(myloc) << '\n'; }
Output:
has_facet<myfacet>(myloc) returns true
See also
the base class for all facet categories: each facet of any category is derived from this type (class) |
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