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Broadcast AbstractRNG like a scalar #33213

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Sep 23, 2019
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Broadcast AbstractRNG like a scalar #33213

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Broadcast AbstractRNG like a scalar
nickrobinson251 Sep 10, 2019
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Add PR link to NEWS
nickrobinson251 Sep 10, 2019
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Merge branch 'master' into npr/broadcast-rng-as-scalar
nickrobinson251 Sep 21, 2019
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6 changes: 4 additions & 2 deletions NEWS.md
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Expand Up @@ -41,11 +41,13 @@ Standard library changes

* `dot` now admits a 3-argument method `dot(x, A, y)` to compute generalized dot products `dot(x, A*y)`, but without computing and storing the intermediate result `A*y` ([#32739]).

#### SparseArrays
#### Random

* `AbstractRNG`s now behave like scalars when used in broadcasting ([#33213]).
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#### Dates
#### SparseArrays

#### Dates

#### Statistics

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2 changes: 2 additions & 0 deletions stdlib/Random/src/Random.jl
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Expand Up @@ -40,6 +40,8 @@ Supertype for random number generators such as [`MersenneTwister`](@ref) and [`R
"""
abstract type AbstractRNG end

Base.broadcastable(x::AbstractRNG) = Ref(x)

gentype(::Type{X}) where {X} = eltype(X)
gentype(x) = gentype(typeof(x))

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4 changes: 4 additions & 0 deletions stdlib/Random/test/runtests.jl
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Expand Up @@ -774,3 +774,7 @@ end
@test Sampler(GLOBAL_RNG, 2:4, Val(1)) isa SamplerRangeFast
@test Sampler(GLOBAL_RNG, 2:4, Val(Inf)) isa SamplerRangeFast
end

@testset "RNGs broadcast as scalars: T" for T in (MersenneTwister, RandomDevice)
@test length.(rand.(T(), 1:3)) == 1:3
end