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

Header: <locale>

Public member function, calls the member function do_thousands_sep of the most derived class.

# Declarations

public:
char_type thousands_sep() const;

protected:
virtual char_type do_thousands_sep() const;

# Return value

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

# Example

#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';
}

# Defect reports

DR	Applied to	Behavior as published	Correct behavior
LWG 20	C++98	the return type was string_type	changed to char_type

# See also

do_grouping