# std::use_facet

From cppreference.com
< cpp‎ | locale

Defined in header `<locale>` |  |
template< class Facet > const Facet& use_facet( const std::locale& loc ); |  |

Obtains a reference to a facet implemented by `loc`.

### Parameters

loc | - | the locale object to query

### Return value

Returns a reference to the facet. The reference returned by this function is valid as long as any std::locale object exists that implements `Facet`.

### Exceptions

std::bad_cast if std::has_facet<Facet>(loc) == false.

### Example

Display the 3-letter currency name used by the user's preferred locale

Run this code

    #include <iostream>
    #include <locale>

    int main()
    {
        std::locale loc = std::locale(""); // user's preferred locale
        std::cout << "Your currency string is "
                  << std::use_facet<std::moneypunct<char, true>>(loc).curr_symbol() << '\n';
    }

Output:

    Your currency string is USD

### See also

locale | set of polymorphic facets that encapsulate cultural differences (class)
has_facet | checks if a locale implements a specific facet (function template)

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