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Make similar faster and safer #18107

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Aug 19, 2016
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Make similar faster and safer #18107

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ac0367b
Make similar faster and safer
timholy Aug 18, 2016
c338485
Test that similar throws a MethodError for unsupported dims types
timholy Aug 18, 2016
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15 changes: 8 additions & 7 deletions base/abstractarray.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ typealias RangeIndex Union{Int, Range{Int}, AbstractUnitRange{Int}, Colon}
typealias DimOrInd Union{Integer, AbstractUnitRange}
typealias IntOrInd Union{Int, AbstractUnitRange}
typealias DimsOrInds{N} NTuple{N,DimOrInd}
typealias NeedsShaping Union{Tuple{Integer,Vararg{Integer}}, Tuple{OneTo,Vararg{OneTo}}}

macro _inline_pure_meta()
Expr(:meta, :inline, :pure)
Expand Down Expand Up @@ -420,14 +421,14 @@ different element type it will create a regular `Array` instead:
2.18425e-314 2.18425e-314 2.18425e-314 2.18425e-314

"""
similar{T}(a::AbstractArray{T}) = similar(a, T)
similar( a::AbstractArray, T::Type) = similar(a, T, to_shape(indices(a)))
similar{T}(a::AbstractArray{T}, dims::Tuple) = similar(a, T, to_shape(dims))
similar{T}(a::AbstractArray{T}, dims::DimOrInd...) = similar(a, T, to_shape(dims))
similar( a::AbstractArray, T::Type, dims::DimOrInd...) = similar(a, T, to_shape(dims))
similar( a::AbstractArray, T::Type, dims) = similar(a, T, to_shape(dims))
similar{T}(a::AbstractArray{T}) = similar(a, T)
similar{T}(a::AbstractArray, ::Type{T}) = similar(a, T, to_shape(indices(a)))
similar{T}(a::AbstractArray{T}, dims::Tuple) = similar(a, T, to_shape(dims))
similar{T}(a::AbstractArray{T}, dims::DimOrInd...) = similar(a, T, to_shape(dims))
similar{T}(a::AbstractArray, ::Type{T}, dims::DimOrInd...) = similar(a, T, to_shape(dims))
similar{T}(a::AbstractArray, ::Type{T}, dims::NeedsShaping) = similar(a, T, to_shape(dims))
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is this now a MethodError or handled elsewhere for dims not in this new Union?

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@timholy timholy Aug 18, 2016 •
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Anything that's not ::Dims or ::NeedsShaping definitely has to be handled elsewhere. That's been the design all along (see CustomUnitRanges.jl), but it turns out that if you mess up and fail to "catch" the similar method then it resulted in a StackOverflowError. This can't do that anymore.

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should this add a test_throws MethodError for such a case?

# similar creates an Array by default
similar{N}(a::AbstractArray, T::Type, dims::Dims{N}) = Array{T,N}(dims)
similar{T,N}(a::AbstractArray, ::Type{T}, dims::Dims{N}) = Array{T,N}(dims)

to_shape(::Tuple{}) = ()
to_shape(dims::Dims) = dims
Expand Down