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Shortcut findfirst for empty arrays. #610

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Shortcut findfirst for empty arrays. #610

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1 change: 1 addition & 0 deletions src/host/indexing.jl
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Expand Up @@ -191,6 +191,7 @@ Base.getindex(ei::EachIndex, i::Int) = ei.indices[i]
Base.IndexStyle(::Type{<:EachIndex}) = Base.IndexLinear()

function Base.findfirst(f::Function, A::AnyGPUArray)
isempty(A) && return nothing
indices = EachIndex(A)
dummy_index = first(indices)

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1 change: 1 addition & 0 deletions test/testsuite.jl
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Expand Up @@ -16,6 +16,7 @@ using Test

using Adapt

test_result(a, b; kwargs...) = a == b
test_result(a::Number, b::Number; kwargs...) = ≈(a, b; kwargs...)
test_result(a::Missing, b::Missing; kwargs...) = true
test_result(a::Number, b::Missing; kwargs...) = false
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4 changes: 4 additions & 0 deletions test/testsuite/indexing.jl
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Expand Up @@ -170,6 +170,10 @@ end
let x = rand(Float32, 10, 10)
@test findfirst(>(0.5f0), x) == findfirst(>(0.5f0), AT(x))
end

# emtpy
@test compare(findfirst, AT, Bool[])
@test compare(x->findfirst(>(0.5f0), x), AT, Float32[])
end

@testset "findmax & findmin" begin
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