std::moneypunct::grouping,do_grouping(3)

NAME
std::moneypunct::grouping,do_grouping - std::moneypunct::grouping,do_grouping

Synopsis
   Defined in header <locale>
   public: (1)
   std::string grouping() const;
   protected: (2)
   virtual std::string do_grouping() const;
   1) Public member function, calls the member function do_grouping of the most derived
   class.
   2) Returns the pattern that determines the grouping of the digits in the monetary
   output, with the same exact meaning as std::numpunct::do_grouping.

Return value
   The object of type std::string holding the groups. The standard specializations of
   std::moneypunct return an empty string, indicating no grouping. Typical groupings
   (e.g. the en_US locale) return "\003".

Example
// Run this code
 #include <iomanip>
 #include <iostream>
 #include <iterator>
 #include <locale>
 struct space_out : std::moneypunct<char>
 {
     pattern do_pos_format() const { return {value, none, none, none}; }
     int do_frac_digits() const { return 0; }
     char_type do_thousands_sep() const { return ' '; }
     string_type do_grouping() const { return "\002"; }
 };
 int main()
 {
     std::cout.imbue(std::locale("en_US.UTF-8"));
     std::cout << "american locale: " << std::showbase
               << std::put_money(12345678.0) << '\n';
     std::cout.imbue(std::locale(std::cout.getloc(), new space_out));
     std::cout << "locale with modified moneypunct: "
               << std::put_money(12345678.0) << '\n';
 }

Output:
 american locale: $123,456.78
 locale with modified moneypunct: 12 34 56 78

See also
   do_thousands_sep provides the character to use as thousands separator
   [virtual] (virtual protected member function)
   do_decimal_point provides the character to use as decimal point
   [virtual] (virtual protected member function)