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conversion from AbstractArray and converting constructors #13

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Apr 21, 2024
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conversion from AbstractArray and converting constructors #13

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26 changes: 26 additions & 0 deletions src/FixedSizeArrays.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -49,4 +49,30 @@ function Base.similar(
similar(FixedSizeArray{E}, axes(bc))
end

# one-based indexing check

axes_are_one_based(axes) = all(isone ∘ first, axes)

# converting constructors for copying other array types

function FixedSizeArray{T,N}(src::AbstractArray{S,N}) where {T,N,S}
axs = axes(src)
axes_are_one_based(axs) ||
throw(DimensionMismatch("source array has a non-one-based indexing axis"))
# Can't use `Base.size` because, according to it's doc string, it's not
# available for all `AbstractArray` types.
size = map(length, axs)
dst = FixedSizeArray{T,N}(undef, size)
copyto!(dst, src)::FixedSizeArray{T,N}
end

FixedSizeArray{T}(a::AbstractArray{<:Any,N}) where {T,N} = FixedSizeArray{T,N}(a)
FixedSizeArray{<:Any,N}(a::AbstractArray{T,N}) where {T,N} = FixedSizeArray{T,N}(a)
FixedSizeArray(a::AbstractArray{T,N}) where {T,N} = FixedSizeArray{T,N}(a)

# conversion

Base.convert(::Type{T}, a::T) where {T<:FixedSizeArray} = a
Base.convert(::Type{T}, a::AbstractArray) where {T<:FixedSizeArray} = T(a)::T

end # module FixedSizeArrays
32 changes: 32 additions & 0 deletions test/runtests.jl
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Expand Up @@ -16,6 +16,22 @@ using FixedSizeArrays
@test similar(FixedSizeVector{Int}, (2,)) isa FixedSizeVector{Int}
@test similar(FixedSizeArray{Int}, (2,)) isa FixedSizeVector{Int}
@test FixedSizeArray{Int}(undef, 2) isa FixedSizeVector{Int}
for T ∈ (FixedSizeArray, FixedSizeVector)
a = 1:3
@test convert(T, a) isa FixedSizeVector{Int}
@test convert(T, a) == a
@test convert(T, convert(T, a)) isa FixedSizeVector{Int}
@test convert(T, convert(T, a)) == a
end
for T ∈ (FixedSizeArray{Int}, FixedSizeVector{Int})
for S ∈ (Int, Float64)
a = map(S, 1:3)
@test convert(T, a) isa FixedSizeVector{Int}
@test convert(T, a) == a
@test convert(T, convert(T, a)) isa FixedSizeVector{Int}
@test convert(T, convert(T, a)) == a
end
end
end

@testset "FixedSizeMatrix" begin
Expand All @@ -32,6 +48,22 @@ using FixedSizeArrays
@test similar(FixedSizeMatrix{Int}, (2, 3)) isa FixedSizeMatrix{Int}
@test similar(FixedSizeArray{Int}, (2, 3)) isa FixedSizeMatrix{Int}
@test FixedSizeArray{Int}(undef, 2, 3) isa FixedSizeMatrix{Int}
for T ∈ (FixedSizeArray, FixedSizeMatrix)
a = reshape(1:9, (3, 3))
@test convert(T, a) isa FixedSizeMatrix{Int}
@test convert(T, a) == a
@test convert(T, convert(T, a)) isa FixedSizeMatrix{Int}
@test convert(T, convert(T, a)) == a
end
for T ∈ (FixedSizeArray{Int}, FixedSizeMatrix{Int})
for S ∈ (Int, Float64)
a = map(S, reshape(1:9, (3, 3)))
@test convert(T, a) isa FixedSizeMatrix{Int}
@test convert(T, a) == a
@test convert(T, convert(T, a)) isa FixedSizeMatrix{Int}
@test convert(T, convert(T, a)) == a
end
end
end

@testset "broadcasting" begin
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