I can confirm this works as described by milktrader on 0.4.0-dev+5860
(2015-07-08 20:57 UTC) Commit 7fa43ed (7 days old master).
julia> unique(foos)
1-element Array{Foo,1}:
Foo(4)
On Thursday, July 16, 2015 at 7:52:03 AM UTC-7, Stefan Karpinski wrote:
>
> I don't see that on 0.4-dev – it also doesn't seem possible without having
> defined a hash method since unique is implemented with a dict.
>
> On Thu, Jul 16, 2015 at 10:29 AM, milktrader <[email protected]
> <javascript:>> wrote:
>
>> Julia 0.4- has different behavior ...
>>
>> First, with 0.3.9
>>
>> julia> versioninfo()
>> Julia Version 0.3.9
>> Commit 31efe69 (2015-05-30 11:24 UTC)
>> Platform Info:
>> System: Darwin (x86_64-apple-darwin13.4.0)
>> CPU: Intel(R) Core(TM)2 Duo CPU P7350 @ 2.00GHz
>> WORD_SIZE: 64
>> BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Penryn)
>> LAPACK: libopenblas
>> LIBM: libopenlibm
>> LLVM: libLLVM-3.3
>>
>> julia> type Foo
>> x::Int
>> end
>>
>> julia> import Base: ==
>>
>> julia> ==(f1::Foo, f2::Foo) = f1.x == f2.x
>> == (generic function with 80 methods)
>>
>> julia> foos = [Foo(4), Foo(4)]
>> 2-element Array{Foo,1}:
>> Foo(4)
>> Foo(4)
>>
>> julia> unique(foos)
>> 2-element Array{Foo,1}:
>> Foo(4)
>> Foo(4)
>>
>> julia> unique(foos)[1] == unique(foos)[2]
>> true
>>
>> And now 0.4-dev
>>
>> julia> versioninfo()
>> Julia Version 0.4.0-dev+5587
>> Commit 78760e2 (2015-06-25 14:27 UTC)
>> Platform Info:
>> System: Darwin (x86_64-apple-darwin13.4.0)
>> CPU: Intel(R) Core(TM)2 Duo CPU P7350 @ 2.00GHz
>> WORD_SIZE: 64
>> BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Penryn)
>> LAPACK: libopenblas
>> LIBM: libopenlibm
>> LLVM: libLLVM-3.3
>>
>> julia> type Foo
>> x::Int
>> end
>>
>> julia> import Base: ==
>>
>> julia> ==(f1::Foo, f2::Foo) = f1.x == f2.x
>> == (generic function with 108 methods)
>>
>> julia> foos = [Foo(4), Foo(4)]
>> 2-element Array{Foo,1}:
>> Foo(4)
>> Foo(4)
>>
>> julia> unique(foos)
>> 1-element Array{Foo,1}:
>> Foo(4)
>>
>> julia> unique(foos)[1] == unique(foos)[2]
>> ERROR: BoundsError: attempt to access 1-element Array{Foo,1}:
>> Foo(4)
>> at index [2]
>> in getindex at array.jl:292
>>
>>
>>
>> On Thursday, July 16, 2015 at 9:36:21 AM UTC-4, Stefan Karpinski wrote:
>>>
>>> You need to also define a hash method for this type.
>>>
>>>
>>> On Jul 16, 2015, at 9:16 AM, Marc Gallant <[email protected]> wrote:
>>>
>>> The unique function doesn't appear to work using iterables of custom
>>> composite types, e.g.,
>>>
>>> julia> type Foo
>>> x::Int
>>> end
>>>
>>> julia> import Base: ==
>>>
>>> julia> ==(f1::Foo, f2::Foo) = f1.x == f2.x
>>> == (generic function with 85 methods)
>>>
>>> julia> unique(foos)
>>> 2-element Array{Foo,1}:
>>> Foo(4)
>>> Foo(4)
>>>
>>> julia> unique(foos)[1] == unique(foos)[2]
>>> true
>>>
>>>
>>> Is this the intended behaviour?
>>>
>>>
>
