實(shí)現(xiàn)字符串split的6種方法

std::vector<std::string> stringSplit(const std::string& str, char delim) {    std::stringstream ss(str);    std::string item;    std::vector<std::string> elems;    while (std::getline(ss, item, delim)) {        if (!item.empty()) {            elems.push_back(item);        }    }    return elems;}

std::vector<std::string> stringSplit(const std::string& str, char delim) {    std::size_t previous = 0;    std::size_t current = str.find(delim);    std::vector<std::string> elems;    while (current != std::string::npos) {        if (current > previous) {            elems.push_back(str.substr(previous, current - previous));        }        previous = current + 1;        current = str.find(delim, previous);    }    if (previous != str.size()) {        elems.push_back(str.substr(previous));    }    return elems;}

std::vector<std::string> stringSplit(const std::string& str, char delim) {    std::size_t previous = 0;    std::size_t current = str.find_first_of(delim);    std::vector<std::string> elems;    while (current != std::string::npos) {        if (current > previous) {            elems.push_back(str.substr(previous, current - previous));        }        previous = current + 1;        current = str.find_first_of(delim, previous);    }    if (previous != str.size()) {        elems.push_back(str.substr(previous));    }    return elems;}

std::vector<std::string> stringSplit(const std::string& strIn, char delim) {    char* str = const_cast<char*>(strIn.c_str());    std::string s;    s.append(1, delim);    std::vector<std::string> elems;    char* splitted = strtok(str, s.c_str());    while (splitted != NULL) {        elems.push_back(std::string(splitted));        splitted = strtok(NULL, s.c_str());    }    return elems;}

std::vector<std::string> stringSplit(const std::string& str, char delim) {    std::vector<std::string> elems;    auto lastPos = str.find_first_not_of(delim, 0);    auto pos = str.find_first_of(delim, lastPos);    while (pos != std::string::npos || lastPos != std::string::npos) {        elems.push_back(str.substr(lastPos, pos - lastPos));        lastPos = str.find_first_not_of(delim, pos);        pos = str.find_first_of(delim, lastPos);    }    return elems;}

std::vector<std::string> stringSplit(const std::string& str, char delim) {    std::string s;    s.append(1, delim);    std::regex reg(s);    std::vector<std::string> elems(std::sregex_token_iterator(str.begin(), str.end(), reg, -1),                                   std::sregex_token_iterator());    return elems;}