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std::has_facet(3) C++ Standard Libary std::has_facet(3) NAME std::has_facet - std::has_facet Synopsis Defined in header <locale> template< class Facet > (until C++11) bool has_facet( const locale& loc ) throw(); template< class Facet > (since C++11) bool has_facet( const locale& loc ) noexcept; Checks if the locale loc implements the facet Facet. Parameters loc - the locale object to query Return value Returns true if the facet Facet was installed in the locale loc, false otherwise. Example // Run this code #include <iostream> #include <locale> // minimal custom facet struct myfacet : public std::locale::facet { static std::locale::id id; }; std::locale::id myfacet::id; int main() { // loc is a "C" locale with myfacet added std::locale loc(std::locale::classic(), new myfacet); std::cout << std::boolalpha << "Can loc classify chars? " << std::has_facet<std::ctype<char>>(loc) << '\n' << "Can loc classify char32_t? " << std::has_facet<std::ctype<char32_t>>(loc) << '\n' << "Does loc implement myfacet? " << std::has_facet<myfacet>(loc) << '\n'; } Output: Can loc classify chars? true Can loc classify char32_t? false Does loc implement myfacet? true See also locale set of polymorphic facets that encapsulate cultural dif- ferences (class) use_facet obtains a facet from a locale (function template) http://cppreference.com 2022.07.31 std::has_facet(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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