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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/locale/moneypunct/curr_symbol.html below:

std::moneypunct<CharT,International>::curr_symbol, do_curr_symbol - cppreference.com

public:
string_type curr_symbol() const;

(1)

protected:
virtual string_type do_curr_symbol() const;

(2)

1) Public member function, calls the member function do_curr_symbol of the most derived class.

2)

Returns the string used as the currency identifier by this locale. If

International

(the second template parameter of

std::moneypunct

) is

false

, the identifier is usually a single (wide) character, such as

"ï¿¥"

or

"$"

. If

International

is

true

, the identifier is usually a four-character string holding the three-character

ISO 4217

currency code followed by a space (

"JPY "

or

"USD "

).

[edit] Return value

The object of type string_type holding the currency symbol or code.

[edit] Example 
#include <iostream>
#include <locale>
 
void show_ccy(const char* locname)
{
    std::locale loc(locname);
    std::cout << locname << " currency symbol is "
              << std::use_facet<std::moneypunct<char, true>>(loc).curr_symbol()
              << "or " << std::use_facet<std::moneypunct<char>>(loc).curr_symbol()
              << " for short\n";
}
 
int main()
{
    show_ccy("en_US.utf8");
    show_ccy("ja_JP.utf8");
    show_ccy("sv_SE.utf8");
    show_ccy("ru_RU.utf8");
    show_ccy("vi_VN.utf8");
}

Output:

en_US.utf8 currency symbol is USD or $ for short
ja_JP.utf8 currency symbol is JPY or ï¿¥ for short
sv_SE.utf8 currency symbol is SEK or kr for short
ru_RU.utf8 currency symbol is RUB or руб for short
vi_VN.utf8 currency symbol is VND or ₫ for short
[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 666 C++98 the length of the identifier string was required to be 4 if International is true not required [edit] See also

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