[julia-users] Write immutable with variable-length array field to a stream

[Andrei Zh]

I work on implementing a binary protocol for a service. This protocol is 
based on messages - structs that support integer numbers, variable-length 
arrays and other structs, i.e. something we could implement in Julia as:

immutable Message1
    version::Int16
    length::Int32
    payload::Array{Message2,1}
end

Creating a serializer for any such message is trivial, but I have about 50 
of them and would like to automate it, i.e. I'd like a generic way to write 
an immutable structure to a stream. So far the closest candidate is 
StrPack.jl <https://strpackjl.readthedocs.io/en/latest/>, but it doesn't 
support variable-length array, which is the must for me. 

Do we have something for this or I should come up with my own 
function/macro?