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Add keytype+valtype method for AbstractArray and AbstractVector #27749

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Add keytype method for AbstractArray and AbstractVector
The function `keytype(a)` returns `eltype(keys(a))` for associative
structures; it should do the same for `Abstract{Array, Vector}`.
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tkluck committed Jun 23, 2018
commit a6b2f976f5e7a5680871f7227cfddff3a61ee071
3 changes: 3 additions & 0 deletions base/abstractarray.jl
Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,9 @@ unsafe_indices(r::AbstractRange) = (OneTo(unsafe_length(r)),) # Ranges use check
keys(a::AbstractArray) = CartesianIndices(axes(a))
keys(a::AbstractVector) = LinearIndices(a)

keytype(a::AbstractArray) = CartesianIndex{ndims(a)}
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keytype(a::AbstractVector) = Int
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prevind(::AbstractArray, i::Integer) = Int(i)-1
nextind(::AbstractArray, i::Integer) = Int(i)+1

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