[julia-users] missing const qualifier

[Carlo Lucibello]

It would be nice to annotate the return type of methods with a constant 
qualifier, in order to have 
an efficient and safe behaviour at the same time. 

I mean something like this:

type A
  data::Vector{Int}
end

# invalid but desiderable julia code
const function getdata(a::A)
  return a.data
end 

a = A(ones(10))
data = getdata(a)

data[1] = 2  # ERROR
a.data[1] = 2 # OK