1) Public member function, calls the member function do_grouping of the most derived class.
This function returns a string, vec, which is used as a vector of integer values. (For example, "\003" specifies groups of 3 digits each, while "3" implies groups of 51 digits each.). Each element vec[i] represents the number of digits in the ith digit group of the integer part of the number, counting from the right: vec[0] holds the number of digits in the rightmost group, vec[1] - in the second group from the right, etc. The grouping indicated by the last character, vec[vec.size()-1], is repeatedly reused to group all remaining digits in the (left part of) the number. If vec[i] is non-positive or equals CHAR_MAX the size of the corresponding digit group is unlimited.
The object of type std::string holding the groups. The standard specializations of std::numpunct return an empty string, indicating no grouping. Typical groupings (e.g. the en_US locale) return "\003".
Output:
Default locale: 12345678 Locale with modified numpunct: 1 2 3 4 5 6 7 8 Locale with \1\2\3 grouping: 18,446,744,073,709,551,61,5 Same, for a floating-point number: 123,456,78,9.123457[edit] See also provides the character to use as thousands separator
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