std::numpunct<CharT>::thousands_sep, do_thousands_sep
From cppreference.com
| Defined in header <locale>
|
||
| public: char_type thousands_sep() const; |
(1) | |
| protected: virtual char_type do_thousands_sep() const; |
(2) | |
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
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
|
See also
| [virtual] |
provides the numbers of digits between each pair of thousands separators (virtual protected member function) |