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

< cpp‎ | locale‎ | numpunct
Defined in header <locale>
char_type thousands_sep() const;
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.


[edit] Return value

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

[edit] 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';


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

[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 20 C++98 the return type was string_type changed to char_type

[edit] See also

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