A basic random number generator implementing the Mersenne Twister algorithm, which is more random, but slower than the default random source.
SDKs
- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- tvOS 9.0+
Framework
- Gameplay
Kit
Declaration
class GKMersenneTwisterRandomSource : GKRandomOverview
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 init(seed:) initializer.
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 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.
For more information on choosing and using randomizers in GameplayKit, read Randomization in GameplayKit Programming Guide.