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Identical mutable struct `MutRange(1, 3) == MutRange(1, 3)` returns false about julia HOT 5 CLOSED

baiango commented on August 28, 2024

Identical mutable struct `MutRange(1, 3) == MutRange(1, 3)` returns false

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Comments (5)

baiango commented on August 28, 2024

I tried to write `complement_range()`, but then got distracted by a squirrel and left it in this state.

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baiango commented on August 28, 2024

Updated Minimal Reproducible Example

mutable struct MutRange
	start::Int
	finish::Int
end

struct Range # has to be mutable
	start::Int
	finish::Int
end

println(MutRange(1, 3) == MutRange(1, 3)) # false

println(Range(1, 3) == Range(1, 3)) # true

println((1, 3) == (1, 3)) # true

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julia> mutable struct MutRange
           start::Int
           finish::Int
       end

julia>

julia> struct Range # has to be mutable
           start::Int
           finish::Int
       end

julia>

julia> println(MutRange(1, 3) == MutRange(1, 3)) # false
false

julia>

julia> println(Range(1, 3) == Range(1, 3)) # true
true

julia>

julia> println((1, 3) == (1, 3)) # true
true

julia>

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fredrikekre commented on August 28, 2024

See https://docs.julialang.org/en/v1/base/math/#Base.:==. In particular

Falls back to ===.

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baiango commented on August 28, 2024

I have encountered an issue where the comparison of mutable structs with identical field values returns false, even when using the == and === operators.

Here's a minimal reproducible example:

mutable struct MutRange
	start::UInt32
	finish::UInt32
end

println(MutRange(1, 3) == MutRange(1, 3)) # false
println(MutRange(1, 3) === MutRange(1, 3)) # false

Based on the documentation at https://docs.julialang.org/en/v1/base/math/#Base.:==, the == operator falls back to === for structs. However, in this case, both comparisons return false.

Could you please investigate this issue and provide guidance on how to correctly compare mutable structs with identical field values?

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fredrikekre commented on August 28, 2024