how can is solve this problem?
mutable struct Parent
name::String
children::Vector{Child}
function Parent(name)
return new(name)
end
end
mutable struct Child
name::String
parent::Parent
function Child(name)
return new(name)
end
end
parent = Parent("father")
child = Child("son")
Produces an error
LoadError: UndefVarError: Child not defined
Is there some way to handle this case?
As far as I know the only way to handle this currently is via a parametric type (I know it is not perfect). Here is an example which additionally restricts the parameter so that you get almost what you want:
abstract type AbstractChild end
mutable struct Parent{T<:AbstractChild}
name::String
children::Vector{T}
function Parent{T}(name) where {T<:AbstractChild}
return new{T}(name)
end
end
mutable struct Child <: AbstractChild
name::String
parent::Parent
function Child(name)
return new(name)
end
end
Parent(name) = Parent{Child}(name)
parent = Parent("father")
child = Child("son")