A basic random number generator implementing the Mersenne Twister algorithm, which is more random, but slower than the default random source.
- iOS 9.0+
- macOS 10.11+
- tvOS 9.0+
To generate basic random values with this random source, use the methods defined in the
GKRandom protocol. To generate random values with a specific range and distribution, use this random source with the
GKRandom class or one of its subclasses.
When you create an instance of this class, the resulting random source is both independent and deterministic—that is, the sequence of numbers generated by one instance has no effect on the sequence generated by any other instance, and that sequence can be replicated when necessary. For details on replicating sequences, see the
seed property and
The Mersenne Twister random source uses a common 64-bit variant of the algorithm originally described by Matsumoto and Nishimura in 2000, based on the Mersenne prime power 19937. This random source is therefore compatible with other implementations of that algorithm, including the
mt19937_64 type from the
std:: template in C++11. That is, if you initialize a
GKMersenne instance and a compatible implementation using the same seed value, both generate the same sequence of numbers.