std::use_facet (3) - Linux Manuals

std::use_facet: std::use_facet

NAME

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