如何使用cpp对中文字符串进行分隔

其实不只是中文，英文，emoji都可以分隔开来

代码如下：

// https://stackoverflow.com/questions/40054732/c-iterate-utf-8-string-with-mixed-length-of-characters
// C++ iterate utf-8 string with mixed length of characters
#include <iostream>
#include <string>
#include <vector>

std::vector <std::string> split_chinese(std::string s) {
    std::vector <std::string> t;
    for (size_t i = 0; i < s.length();) {
        int cplen = 1;
        // 以下的几个if，要参考这里 https://en.wikipedia.org/wiki/UTF-8#Description
        if ((s[i] & 0xf8) == 0xf0)      // 11111000, 11110000
            cplen = 4;
        else if ((s[i] & 0xf0) == 0xe0) // 11100000
            cplen = 3;
        else if ((s[i] & 0xe0) == 0xc0) // 11000000
            cplen = 2;
        if ((i + cplen) > s.length())
            cplen = 1;
        t.push_back(s.substr(i, cplen));
        i += cplen;
    }
    return t;
}

int main(int argc, char *argv[]) {
    std::string s = "我爱中文，我爱coding🤪";
    std::vector <std::string> t = split_chinese(s);
    for (auto a: t) {
        std::cout << a << std::endl;
    }
    return 0;
}

运行

build

clang++ SplitString.cpp -o splitString -std=c++17

run

./splitString