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

std::numpunct<CharT>::thousands_sep, do_thousands_sep - cppreference.com

public:
char_type thousands_sep() const;

protected:
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.

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

#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

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

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