Classes
struct	uuid

Functions
uuid	uuid4 ()

uuid	rebuild (uint64_t ab, uint64_t cd)

uuid	rebuild (const std::string &uustr)

Detailed Description

Modified version of sole (https://github.com/r-lyeh-archived/sole) C++11 library to only generate UUID v4.

Sole is a lightweight C++11 library to generate universally unique identificators. Sole provides interface for UUID versions 0, 1 and 4.

Based on code by Dmitri Bouianov, Philip O'Toole, Poco C++ libraries and anonymous code found on the net. Thanks guys!

Theory: (see Hoylen's answer at [1])

UUID version 1 (48-bit MAC address + 60-bit clock with a resolution of 100ns) Clock wraps in 3603 A.D. Up to 10000000 UUIDs per second. MAC address revealed.
UUID Version 4 (122-bits of randomness) See [2] or other analysis that describe how very unlikely a duplicate is.
Use v1 if you need to sort or classify UUIDs per machine. Use v1 if you are worried about leaving it up to probabilities (e.g. your are the type of person worried about the earth getting destroyed by a large asteroid in your lifetime). Just use a v1 and it is guaranteed to be unique till 3603 AD.
Use v4 if you are worried about security issues and determinism. That is because v1 UUIDs reveal the MAC address of the machine it was generated on and they can be predictable. Use v4 if you need more than 10 million uuids per second, or if your application wants to live past 3603 A.D. Additionally a custom UUID v0 is provided:
16-bit PID + 48-bit MAC address + 60-bit clock with a resolution of 100ns since Unix epoch
Format is EPOCH_LOW-EPOCH_MID-VERSION(0)|EPOCH_HI-PID-MAC
Clock wraps in 3991 A.D.
Up to 10000000 UUIDs per second.
MAC address and PID revealed. References:
[1] http://stackoverflow.com/questions/1155008/how-unique-is-uuid
[2] http://en.wikipedia.org/wiki/UUID#Random%5FUUID%5Fprobability%5Fof%5Fduplicates
http://en.wikipedia.org/wiki/Universally_unique_identifier
http://en.cppreference.com/w/cpp/numeric/random/random_device
http://www.itu.int/ITU-T/asn1/uuid.html f81d4fae-7dec-11d0-a765-00a0c91e6bf6
rlyeh ~~ listening to Hedon Cries / Until The Sun Goes up

Classes

Functions

Detailed Description