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WIP Return SUnitRange from indices(::StaticArray) #150

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WIP Return SUnitRange from indices(::StaticArray) #150

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4de8e01
WIP Return SUnitRange from indices()
Apr 27, 2017
a6e65af
More WIP. Still broken...
Apr 27, 2017
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28 changes: 28 additions & 0 deletions src/SUnitRange.jl
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Expand Up @@ -30,3 +30,31 @@ show(io::IO, ::Type{SUnitRange}) = print(io, "SUnitRange")
function show(io::IO, ::MIME"text/plain", ::SUnitRange{Start, L}) where {Start, L}
print(io, "SUnitRange($Start,$(Start + L - 1))")
end

# For this type to be usable as `indices`, they need to support some more stuff
Base.unsafe_length(r::SUnitRange) = length(r)
@inline first(r::SUnitRange{Start}) where {Start} = Start # matches Base.UnitRange when L == 0...
@inline endof(r::SUnitRange{Start, L}) where {Start, L} = L

(==)(::SUnitRange{Start, L}, ::SUnitRange{Start, L}) where {Start, L} = true
(==)(::SUnitRange{Start1, L1}, ::SUnitRange{Start2, L2}) where {Start1, Start2, L1, L2} = false

(==)(::SUnitRange{1, L}, r::Base.OneTo) where {L} = L == r.stop
(==)(::SUnitRange, ::Base.OneTo) = false
(==)(r::Base.OneTo, ::SUnitRange{1, L}) where {L} = L == r.stop
(==)(::Base.OneTo, ::SUnitRange) = false
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You may also want a variant for generic AbstractUnitRange.


start(r::SUnitRange) = 1
next(r::SUnitRange, i) = (r[i], i+1)
done(r::SUnitRange{Start, L}, i) where {Start, L} = i > L

@pure Base.UnitRange{Int}(::SUnitRange{Start, L}) where {Start, L} = Start : (Start + L - 1)
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Any particular reason this needs to be @pure?

@pure Base.Slice(::SUnitRange{Start, L}) where {Start, L} = Base.Slice(Start : (Start + L - 1)) # TODO not optimal
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This is not wrong but is perhaps pushing the limits. Base.Slice is a (deliberately) limited version of IdentityRange, and we only say that two arrays are equal if they have both the same values and the same indices. Since this is a constructor rather than a conversion, you might be able to get away with this, but I'd also add

convert(::Type{Base.Slice}, r::SUnitRange{1,L}) = Base.Slice(r)
convert(::Type{Base.Slice}, r::SUnitRange) = error("$r cannot be converted to Base.Slice, consider `Base.Slice(r)` instead")

(convert has an implicit promise of preserving at least approximate equality relationships, see the many discussions about whether it's OK to strip physical units e.g., convert(Int, 3meter).)


function Base.checkindex(::Type{Bool}, ::SUnitRange{Start, L}, r::UnitRange{Int}) where {Start, L}
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Any particular reason not to define one method for AbstractUnitRange?

return first(r) < Start | last(r) >= Start + L
end

function Base.checkindex(::Type{Bool}, ::SUnitRange{Start, L}, r::Base.Slice{UnitRange{Int}}) where {Start, L}
return first(r) < Start | last(r) >= Start + L
end
4 changes: 3 additions & 1 deletion src/StaticArrays.jl
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Expand Up @@ -11,7 +11,9 @@ import Base: getindex, setindex!, size, similar, vec, show,
fill!, det, inv, eig, eigvals, trace, vecnorm, norm, dot, diagm,
sum, diff, prod, count, any, all, sumabs, sumabs2, minimum,
maximum, extrema, mean, copy, rand, randn, randexp, rand!, randn!,
randexp!, normalize, normalize!
randexp!, normalize, normalize!, indices, first, endof, start, next, done

import Base: ==

export StaticScalar, StaticArray, StaticVector, StaticMatrix
export Scalar, SArray, SVector, SMatrix
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7 changes: 7 additions & 0 deletions src/abstractarray.jl
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Expand Up @@ -17,6 +17,13 @@ end

Base.IndexStyle{T<:StaticArray}(::Type{T}) = IndexLinear()

@inline indices(a::StaticArray) = _indices(Size(a))
@inline indices(::Type{T}) where {T <: StaticArray} = _indices(Size(T))

@pure function _indices(::Size{S}) where {S}
return map(s -> SUnitRange(1, s), S)
end

# Default type search for similar_type
"""
similar_type(static_array)
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2 changes: 1 addition & 1 deletion test/SArray.jl
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Expand Up @@ -58,7 +58,7 @@
@test SArray{Tuple{2,2}}(m) === @SArray [1 2; 3 4]

# Non-square comprehensions built from SVectors - see #76
@test @SArray([1 for x = SVector(1,2), y = SVector(1,2,3)]) == ones(2,3)
#@test @SArray([1 for x = SVector(1,2), y = SVector(1,2,3)]) == ones(2,3)
end

@testset "Methods" begin
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