Std::use_facet (3) Linux Manual Page

std::use_facet – std::use_facet

Synopsis

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

std::use_facet (3) Linux Manual Page