Is there're a way to seed Swift 4.2 random number generator
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I like the new Swift 4.2 RandomNumberGenerator thing, but I don't see a seed possibility there. Am I missing something, or is there any way at all to seed these generators, by maybe calling an underlying low-level function? I have a lot of code, which uses default number generators on default number types, and I now need to make sure that everything behaves exactly the same between launches with as little code changes as possible.
ios swift random random-seed swift4.2
asked Nov 17 '18 at 4:56
user3537411user3537411
70421021
add a comment |
I like the new Swift 4.2 RandomNumberGenerator thing, but I don't see a seed possibility there. Am I missing something, or is there any way at all to seed these generators, by maybe calling an underlying low-level function? I have a lot of code, which uses default number generators on default number types, and I now need to make sure that everything behaves exactly the same between launches with as little code changes as possible.
ios swift random random-seed swift4.2
asked Nov 17 '18 at 4:56
user3537411user3537411
70421021
add a comment |
I like the new Swift 4.2 RandomNumberGenerator thing, but I don't see a seed possibility there. Am I missing something, or is there any way at all to seed these generators, by maybe calling an underlying low-level function? I have a lot of code, which uses default number generators on default number types, and I now need to make sure that everything behaves exactly the same between launches with as little code changes as possible.
ios swift random random-seed swift4.2
asked Nov 17 '18 at 4:56
user3537411user3537411
70421021
I like the new Swift 4.2 RandomNumberGenerator thing, but I don't see a seed possibility there. Am I missing something, or is there any way at all to seed these generators, by maybe calling an underlying low-level function? I have a lot of code, which uses default number generators on default number types, and I now need to make sure that everything behaves exactly the same between launches with as little code changes as possible.
ios swift random random-seed swift4.2
ios swift random random-seed swift4.2
asked Nov 17 '18 at 4:56
user3537411user3537411
70421021
asked Nov 17 '18 at 4:56
user3537411user3537411
70421021
asked Nov 17 '18 at 4:56
user3537411user3537411
70421021
asked Nov 17 '18 at 4:56
user3537411user3537411
70421021
asked Nov 17 '18 at 4:56
user3537411user3537411
70421021
70421021
add a comment |
add a comment |
2 Answers
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The whole idea of the new architecture is that any generator can be substituted just by adopting the RandomNumberGenerator protocol. So if you need a repeatable seed, use your own random generator algorithm.
answered Nov 17 '18 at 5:05
mattmatt
337k48553751
add a comment |
If you want reproducibility via explicit seeding you can use the GameplayKit implementation of Mersenne Twister:
import Cocoa
import GameplayKit
let mt = GKMersenneTwisterRandomSource.init(seed: 12345)
for _ in (1...5) {
print(mt.nextUniform())
}
answered Nov 17 '18 at 20:21
pjspjs
13.4k41641
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The whole idea of the new architecture is that any generator can be substituted just by adopting the RandomNumberGenerator protocol. So if you need a repeatable seed, use your own random generator algorithm.
answered Nov 17 '18 at 5:05
mattmatt
337k48553751
add a comment |
The whole idea of the new architecture is that any generator can be substituted just by adopting the RandomNumberGenerator protocol. So if you need a repeatable seed, use your own random generator algorithm.
answered Nov 17 '18 at 5:05
mattmatt
337k48553751
add a comment |
The whole idea of the new architecture is that any generator can be substituted just by adopting the RandomNumberGenerator protocol. So if you need a repeatable seed, use your own random generator algorithm.
answered Nov 17 '18 at 5:05
mattmatt
337k48553751
The whole idea of the new architecture is that any generator can be substituted just by adopting the RandomNumberGenerator protocol. So if you need a repeatable seed, use your own random generator algorithm.
answered Nov 17 '18 at 5:05
mattmatt
337k48553751
edited Nov 17 '18 at 5:21
answered Nov 17 '18 at 5:05
mattmatt
337k48553751
answered Nov 17 '18 at 5:05
mattmatt
337k48553751
answered Nov 17 '18 at 5:05
mattmatt
337k48553751
337k48553751
add a comment |
add a comment |
If you want reproducibility via explicit seeding you can use the GameplayKit implementation of Mersenne Twister:
import Cocoa
import GameplayKit
let mt = GKMersenneTwisterRandomSource.init(seed: 12345)
for _ in (1...5) {
print(mt.nextUniform())
}
answered Nov 17 '18 at 20:21
pjspjs
13.4k41641
add a comment |
If you want reproducibility via explicit seeding you can use the GameplayKit implementation of Mersenne Twister:
import Cocoa
import GameplayKit
let mt = GKMersenneTwisterRandomSource.init(seed: 12345)
for _ in (1...5) {
print(mt.nextUniform())
}
answered Nov 17 '18 at 20:21
pjspjs
13.4k41641
add a comment |
If you want reproducibility via explicit seeding you can use the GameplayKit implementation of Mersenne Twister:
import Cocoa
import GameplayKit
let mt = GKMersenneTwisterRandomSource.init(seed: 12345)
for _ in (1...5) {
print(mt.nextUniform())
}
answered Nov 17 '18 at 20:21
pjspjs
13.4k41641
If you want reproducibility via explicit seeding you can use the GameplayKit implementation of Mersenne Twister:
import Cocoa
import GameplayKit
let mt = GKMersenneTwisterRandomSource.init(seed: 12345)
for _ in (1...5) {
print(mt.nextUniform())
}
answered Nov 17 '18 at 20:21
pjspjs
13.4k41641
answered Nov 17 '18 at 20:21
pjspjs
13.4k41641
answered Nov 17 '18 at 20:21
pjspjs
13.4k41641
answered Nov 17 '18 at 20:21
pjspjs
13.4k41641
13.4k41641
add a comment |
add a comment |
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