protected virtual member function
<locale>
std::numpunct::do_thousands_sep
char_type do_thousands_sep() const;
Return thousands separator character [virtual]
Virtual protected member function called by numpunct::thousands_sep to obtain the character used to represent the digit group separator.
Polymorphic derived classes can overwrite the behavior of this function.
See numpunct::thousands_sep for its default behavior in numpunct's standard specializations.