C++ Randomly Generate UUID (Windows&Linux)

 

#include<random>
#include<sstream>

//随机生成UUID
std::string ToolImpls::GetUUID() {
     static std::random_device rd;
     static std::uniform_int_distribution<uint64_t> dist(0ULL, 0xFFFFFFFFFFFFFFFFULL);
     uint64_t ab = dist(rd);
     uint64_t cd = dist(rd);
     uint32_t a, b, c, d;
     std::stringstream ss;
     ab = ( ab & 0xFFFFFFFFFFFF0FFFULL ) | 0x0000000000004000ULL;
     cd = ( cd & 0x3FFFFFFFFFFFFFFFULL ) | 0x8000000000000000ULL;
     a  = ( ab >> 32U );
     b  = ( ab & 0xFFFFFFFFU);
     c  = ( cd >> 32U );
     d  = ( cd & 0xFFFFFFFFU);
     ss << std::hex << std::nouppercase << std::setfill('0');
     ss << std::setw(8) << (a) ;//<< '-';
     ss << std::setw(4) << (b >> 16U) ;//<< '-';
     ss << std::setw(4) << (b & 0xFFFFU);// << '-';
     ss << std::setw(4) << (c >> 16U) ;//<< '-';
     ss << std::setw(4) << (c & 0xFFFFU);
     ss << std::setw(8) << d;

return ss.str();
}