copy-in Random.ltm52 which was deleted from Random (for shuffle) (#35)

Author: rfourquet

Project.toml

@@ -1,7 +1,7 @@
 name = "StableRNGs"
 uuid = "860ef19b-820b-49d6-a774-d7a799459cd3"
 authors = ["Rafael Fourquet <[email protected]>"]
-version = "1.0.3"
+version = "1.0.4"
 
 [deps]
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"

src/StableRNGs.jl

@@ -151,12 +151,17 @@ function _shuffle!(r::StableRNG, a::AbstractArray)
     mask = nextpow(2, n) - 1
     for i = n:-1:2
         (mask >> 1) == i && (mask >>= 1)
-        j = 1 + rand(r, Random.ltm52(i, mask))
+        j = 1 + rand(r, ltm52(i, mask))
         a[i], a[j] = a[j], a[i]
     end
     return a
 end
 
+# copied from Random, from which this was deleted in https://github.com/JuliaLang/julia/pull/50509
+"Return a sampler generating a random `Int` (masked with `mask`) in ``[0, n)``, when `n <= 2^52`."
+ltm52(n::Int, mask::Int=nextpow(2, n)-1) = LessThan(n-1, Masked(mask, Random.UInt52Raw(Int)))
+
+
 # https://github.com/JuliaRandom/StableRNGs.jl/issues/20
 @noinline function Random.randn_unlikely(rng::StableRNG, idx, rabs, x)
     @inbounds if idx == 0