c++ - What is not thread safe about this function?

Question

I have this function that takes a string, and gets the text in between 2 given delimiters/texts.

std::vector<std::string> StandardFunctions::split_given_string_two_delimiters(const std::string& str, const std::string& start_delimiter, const std::string& end_delimiter) {
    std::vector<std::string> split_vector;
    std::string::size_type start = 0, end;
    while ((start = str.find(start_delimiter, start)) != std::string::npos)
    {
        start += start_delimiter.size();
        if ((end = str.find(end_delimiter, start)) == std::string::npos) {
            break;
        }
        split_vector.push_back(str.substr(start, end - start));
        start = end + end_delimiter.size();
    }
    return split_vector;
}

I don't see any modification/writing to a global variable taking place. Each thread has their own strings that are passed to the function as well. Am I missing something?

Answer 1

等待大神解答