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std::locale::id(3) C++ Standard Libary std::locale::id(3) NAME std::locale::id - std::locale::id Synopsis Defined in header <locale> class locale::id; The class std::locale::id provides implementation-specific identifi- cation of a locale facet. Each class derived from std::locale::facet must have a public static member named id of type std::locale::id and each std::locale object maintains a list of facets it implements, indexed by their ids. Facets with the same id belong to the same facet category and re- place each other when added to a locale object. Member functions constructor 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. // Run this code #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::boolal- pha << 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 facet from this type (class) http://cppreference.com 2022.07.31 std::locale::id(3)
NAME | Synopsis | Member functions | Example | Output: | See also
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