[C++知识库]c++/c-获取随机长度的字符串

实现跨平台的实现随机长度的字符串获取，两种方法：

随机字符串实现1：??

std::random_device rd;
std::mt19937 generator(rd());

std::string get_uuid(int len)
{
    std::string  out;

    int flag = 0, i = 0;
    for (i = 0; i < len - 1; i++)
    {
        flag = get_rand_num() % 3;
        switch (flag)
        {
        case 0:
            out+= 'A' + get_rand_num() % 26;
            break;
        case 1:
            out += 'a' + get_rand_num() % 26;
            break;
        case 2:
            out += '0' + get_rand_num() % 10;
            break;
        default:
            out += 'x';
            break;
        }
    }
    return out;
}

unsigned int get_rand_num()
{
    return generator();
}

int get_rand_range(int i_min, int i_max)
{
    if (i_min >= i_max)
    {
        return get_rand_num();
    }
    return i_min + (int)(get_rand_num() % (i_max - i_min));
}

随机字符串实现2：?

std::random_device rd;
std::mt19937 generator(rd());

std::string  get_random_string(const int randomStringLength)
{
    const std::string possibleCharacters("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
     

    std::string randomString;
    for (int i = 0; i < randomStringLength; ++i)
    {
        int index = generator() % possibleCharacters.length();
        char nextChar = possibleCharacters.at(index);
        randomString = randomString + nextChar;
    }
    return randomString;
}