C's offsetof in julia

offsetof_julia.jl

type ABC a::Int64; b::Int64; c::Int64 end

function offsetof(type_, member::Symbol)
  for (i, item) in enumerate(fieldnames(type_))
    if item == member
      return fieldoffset(type_, i)
    end
    #print(typeof(i))
  end
  # what to do when symbol not in type_?
  throw("$type_ has no member named $member")
end

#@code_native offsetof(ABC, :c)
offsetof(ABC, :a) # 0
offsetof(ABC, :b) # 8
offsetof(ABC, :c) # 16