It's not possible in Julia at the moment. There's an issue for it.
<https://github.com/JuliaLang/julia/issues/269> I think the main options
are:
- Don't declare the types. This may make it slower, but depending on the
use case it might not be a big deal
- Use parametric types, i.e.
type Node{T}
edges::Vector{T}
end
type Edge{T}
node::T
end
On Friday, August 26, 2016 at 1:38:38 PM UTC-4, [email protected] wrote:
>
> Hello all,
>
> I'm making a transition from Python to Julia and in the process, I've
> encountered a small difficulty. While in python, i declared three classes
> as follows:
>
> class PHY_NODES:
> def __init__(self, nodeID, nodenum, x, y, demands):
> self.id = nodeID
> self.nodenum = nodenum
> self.x = x
> self.y = y
> self.inEdges = []
> self.outEdges = []
> self.demands = demands
>
> def __str__(self):
> return "Physical Node ID: nodenum: %4d x: %.3f y: %.3f" %(self.id,
> self.nodenum, self.x, self.y )
>
> def addInEdge(self, edge):
> self.inEdges.append( edge )
>
> def addOutEdge(self, edge):
> self.outEdges.append( edge )
>
>
> class PHY_LINKS:
> def __init__(self, linkID, source, destination, SourceID,
> DestinationID,):
> self.linkID = linkID
> self.source = source
> self.destination = destination
> self.SourceID = SourceID
> self.DestinationID = DestinationID
>
>
> def __str__(self):
> return "Physical Link ID: %4d source: %s destination: %s SourceID:
> %4d DestinationID: %4d " %(self.linkID, self.source, self.destination,
> self.SourceID, self.DestinationID, )
>
>
> class DEMAND:
> def __init__(self, PoP_bdw_up, PoP_stor, PoP_pro, MME_bdw_up,
> MME_stor, MME_pro,demandID):
> self.PoP_bdw_up = PoP_bdw_up
> self.PoP_stor = PoP_stor
> self.PoP_pro = PoP_pro
> self.MME_bdw_up = MME_bdw_up
> self.MME_stor = MME_stor
> self.MME_pro = MME_pro
> self.demandID = demandID
>
>
> def __str__(self):
> return " PoPbdwup: %.3f PoPstor: %.3f PoPpro: %.3f MMEbdwup: %.3f
> MMEstor: %.3f MMEpro: %.3f, self.demandID )
>
> However, I have some trouble when replicating the same in Julia especially
> due to the nested classes in PHY_NODES (self.inEdges as well as
> self,demands)
>
> The Julia version of the Phy_Node class is as below:
>
> type PhysicalNodes
> ID:Int
> name:String
> x: Float
> y:Float
> inEdges: ?
> outEdges: ?
> demands: ?
> end
>
> I don't how to declare the inEdges, outEdges and demands here. Could you
> please help me with this?
>
>
