C++分割字符串

C++没有提供专门用于分割字符串的函数，参考网上提供的方法，给出代码如下：

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

std::vector<std::string> split(const std::string& str, const std::string& delim) {
    std::vector<std::string> res;
    if (str.empty()) return res;
    char * strs = new char[str.length() + 1];
    strcpy_s(strs, str.length() + 1, str.c_str());

    char * d = new char[delim.length() + 1];
    strcpy_s(d, delim.length() + 1, delim.c_str());

    char *next_token = nullptr;
    char *p = strtok_s(strs, d, &next_token);
    while (p) {
        std::string s = p; 
        res.push_back(s); 
        p = strtok_s(NULL, d, &next_token);
    }
    return res;
}

测试代码如下：
int main()
{
    std::string mac_str = "74:72:B0:46:0C:1C;00:DB:DF:54:2F:0E";

    std::vector<std::string> mac_vec = split(mac_str, ";");
    if (mac_vec.empty())
        std::cout << "empty" << std::endl;

    for (size_t i = 0; i < mac_vec.size(); ++i) {
        std::cout << mac_vec[i] << std::endl;
    }

    sort(mac_vec.begin(), mac_vec.end());
    for (size_t i = 0; i < mac_vec.size(); ++i) {
        std::cout << mac_vec[i] << std::endl;
    }

    int a;
    std::cin >> a;
}