std::numpunct::thousands_sep,do_thousands_sep (3) Linux Manual Page

std::numpunct<CharT>::thousands_sep,do_thousands_sep – std::numpunct<CharT>::thousands_sep,do_thousands_sep

Synopsis

Defined in header<locale>

    public : (1)

                 char_type thousands_sep() const;

protected:
(2)

    virtual char_type do_thousands_sep() const;

1) Public member function, calls the member function do_thousands_sep of the most derived class.
2) Returns the character to be used as the separator between digit groups when parsing or formatting integers and integral parts of floating-point values.

Return value

The object of type char_type to use as the thousands separator. The standard specializations of std::numpunct return ‘,’ and L’,’.

Example

// Run this code

#include <iostream>

#include <locale>
struct space_out : std::numpunct<char> {
    char do_thousands_sep() const
    {
        return ' ';
    } // separate with spaces
    std::string do_grouping() const
    {
        return "\1";
    } // groups of 1 digit
};
int main()

{
    std::cout << "default locale: " << 12345678 << '\n';
    std::cout.imbue(std::locale(std::cout.getloc(), new space_out));
    std::cout << "locale with modified numpunct: " << 12345678 << '\n';
}

Output:

  default locale: 12345678
  locale with modified numpunct: 1 2 3 4 5 6 7 8

See also

do_grouping provides the numbers of digits between each pair of thousands separators
            (virtual protected member function)
[virtual]