Julia, type interdependencies

1
votes

How would I resolve something like this:

type Foo
    x::Goo
    end

type Goo
    y::Foo
    end

I feel like this is a compile vs run-time issue, is there a way to pre-declare types so that the interpreter/compiler/whatever doesn't throw a LoadError?

1
julia

1 Answers

3
votes

One way is to use an abstract type

abstract GooLike

type Foo
     x::GooLike
end

type Goo <: GooLike
     y::Foo
end

or parametric version

type Foo{T<:GooLike}
    x::T
end

There is an open issue (as of the 2014-08-08) about circular dependencies.