Hi,
When using deepcopy() to copy an immutable type it does not copy everything
recursively.
There is a discussion here
<https://groups.google.com/d/msg/julia-users/kug8rdy5JYo/0d9014DugOgJ> in
which Stefan Karpinski requests a bug be filed resulting in #3301.
But the behavior seems to be the same. So, is deepcopy() supposed to copy
inner arrays or not?
Here is an example:
First using an non-immutable type
type foo
myArr::Array{Int64,1}
end
f1 = foo([1,1])
f2 = f1
f3 = deepcopy(f1)
f4 = foo(copy(f1.myArr))
println("f1: $(f1) \nf2: $(f2) \nf3: $(f3) \nf4: $(f4)\n")
# prints...
# f1: foo([1,1])
# f2: foo([1,1])
# f3: foo([1,1])
# f4: foo([1,1])
f2.myArr[1]= 2
f3.myArr[1]= 3
f4.myArr[1]= 4
println("f1: $(f1) \nf2: $(f2) \nf3: $(f3) \nf4: $(f4)\n")
#prints:
# f1: foo([2,1])
# f2: foo([2,1])
# f3: foo([3,1])
# f4: foo([4,1])
The above non-immutable type functions exactly as expected.
Now, the same using immutable types
immutable Immfoo
myArr::Array{Int64,1}
end
Imm1 = Immfoo([1,1])
Imm2 = Imm1
Imm3 = deepcopy(Imm1)
Imm4 = Immfoo(copy(Imm1.myArr))
println("Imm1: $(Imm1) \nImm2: $(Imm2) \nImm3: $(Imm3) \nImm4: $(Imm4)\n")
# prints...
# Imm1: Immfoo([1,1])
# Imm2: Immfoo([1,1])
# Imm3: Immfoo([1,1])
# Imm4: Immfoo([1,1])
Imm2.myArr[1]= 2
Imm3.myArr[1]= 3
Imm4.myArr[1]= 4
println("Imm1: $(Imm1) \nImm2: $(Imm2) \nImm3: $(Imm3) \nImm4: $(Imm4)\n")
# prints...
# Imm1: Immfoo([3,1])
# Imm2: Immfoo([3,1])
# Imm3: Immfoo([3,1])
# Imm4: Immfoo([4,1])
Here, Imm3 is pointing at the same array as Imm1 and Imm2.
Is this as intended?
Andre
