Sunshine/uuid.h

51 lines
1.1 KiB
C++

//
// Created by loki on 8-2-19.
//
#ifndef T_MAN_UUID_H
#define T_MAN_UUID_H
#include <random>
union uuid_t {
std::uint8_t b8[16];
std::uint16_t b16[8];
std::uint32_t b32[4];
std::uint64_t b64[2];
static uuid_t generate(std::default_random_engine &engine) {
std::uniform_int_distribution<std::uint8_t> dist(0, std::numeric_limits<std::uint8_t>::max());
uuid_t buf;
for(auto &el : buf.b8) {
el = dist(engine);
}
buf.b8[7] &= (std::uint8_t) 0b00101111;
buf.b8[9] &= (std::uint8_t) 0b10011111;
return buf;
}
static uuid_t generate() {
std::random_device r;
std::default_random_engine engine { r() };
return generate(engine);
}
constexpr bool operator==(const uuid_t &other) const {
return b64[0] == other.b64[0] && b64[1] == other.b64[1];
}
constexpr bool operator<(const uuid_t &other) const {
return (b64[0] < other.b64[0] || (b64[0] == other.b64[0] && b64[1] < other.b64[1]));
}
constexpr bool operator>(const uuid_t &other) const {
return (b64[0] > other.b64[0] || (b64[0] == other.b64[0] && b64[1] > other.b64[1]));
}
};
#endif //T_MAN_UUID_H