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make vector cmp match axes #59500

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Merged
adienes merged 5 commits into from
Sep 29, 2025
Merged

make vector cmp match axes #59500

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dc1167b
max vector `cmp` match axes
adienes Sep 6, 2025
3d6b496
oops
adienes Sep 12, 2025
728253b
Merge branch 'master' into lex_arr_cmp
adienes Sep 12, 2025
56ce1d6
Merge branch 'master' into lex_arr_cmp
adienes Sep 29, 2025
c5eced1
add docs
adienes Sep 29, 2025
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5 changes: 4 additions & 1 deletion base/abstractarray.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -3020,6 +3020,8 @@ function isequal(A::AbstractArray, B::AbstractArray)
end

function cmp(A::AbstractVector, B::AbstractVector)
ai1, bi1 = firstindex(A), firstindex(B)
isequal(ai1, bi1) || return cmp(ai1, bi1)
for (a, b) in zip(A, B)
if !isequal(a, b)
return isless(a, b) ? -1 : 1
Expand All @@ -3040,7 +3042,8 @@ end
"""
isless(A::AbstractVector, B::AbstractVector)

Return `true` when `A` is less than `B` in lexicographic order.
Return `true` when `A` is less than `B`. Vectors are first compared by
their starting indices, and then lexicographically by their elements.
"""
isless(A::AbstractVector, B::AbstractVector) = cmp(A, B) < 0

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12 changes: 12 additions & 0 deletions test/arrayops.jl
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Expand Up @@ -1465,6 +1465,18 @@ end
@test cmp([UInt8(1), UInt8(0)], [UInt8(0), UInt8(0)]) == 1
@test cmp([UInt8(1), UInt8(0)], [UInt8(1), UInt8(0)]) == 0
@test cmp([UInt8(0), UInt8(0)], [UInt8(1), UInt8(1)]) == -1

x = [1, 2, 3]
y = OffsetVector(x, -1)
@test cmp(x, y) == 1
@test cmp(y, x) == -1
@test !isless(x, y)
@test isless(y, x)

y2 = OffsetVector([1, 2, 3], 0)
@test cmp(x, y2) == 0
@test !isless(x, y2)
@test !isless(y2, x)
end

@testset "sort on arrays" begin
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