string that have both comma and space

struct tokens: std::ctype<char>{

    tokens(): std::ctype<char>(get_table()){}static std::ctype_base::mask const* get_table(){typedef std::ctype<char> cctype;staticconst cctype::mask *const_rc= cctype::classic_table();static cctype::mask rc[cctype::table_size];

        std::memcpy(rc, const_rc, cctype::table_size *sizeof(cctype::mask));

        rc[',']= std::ctype_base::space;

        rc[' ']= std::ctype_base::space;return&rc[0];}};

std::string s ="right way, wrong way, correct way";

std::stringstream ss(s);

ss.imbue(std::locale(std::locale(),new tokens()));

std::istream_iterator<std::string> begin(ss);

std::istream_iterator<std::string> end;

std::vector<std::string> vstrings(begin, end);

std::copy(vstrings.begin(), vstrings.end(), std::ostream_iterator<std::string>(std::cout,"\n"));

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只有空格：
tring s ="What is the right way to split a string into a vector of strings";

std::stringstream ss(s);

std::istream_iterator<std::string> begin(ss);

std::istream_iterator<std::string> end;

std::vector<std::string> vstrings(begin, end);

std::copy(vstrings.begin(), vstrings.end(), std::ostream_iterator<std::string>(std::cout,"\n"));