[julia-users] eval in function scope (accessing function args)

[Phil Tomson]

Given:

    abstract ABSGene
    type NuGene <: Genetic.ABSGene
         fqnn::ANN
         dcqnn::ANN
         score::Float32
     end

     function mutate_copy{T<:ABSGene}(gene::T)
         all_fields_except_score = filter(x->x != :score, names(T))
         all_fields_except_score =  map(x->("mutate_copy(*gene*
.$x)"),all_fields_except_score)
         eval(parse("$(T)("*join(all_fields_except_score,",")*")"))
     end

     ng = NuGene()

     mutated_ng = mutate_copy(ng)


results in:
      
    ERROR: gene not defined
    in mutate_copy at none:4

If I just look at it as a string (prior to running parse and eval)  it 
looks fine:

    "NuGene(mutate_copy(gene.fqnn),mutate_copy(gene.dcqnn))"

However, eval doesn't seem to know about gene that has been passed into the 
mutate_copy function.

How do I access the gene argument that's been passed into the mutate copy?

I tried this:

function mutate_copy{T<:ABSGene}(gene::T)
  all_fields_except_score = filter(x->x != :score, names(T))
  all_fields_except_score =  map(x->("mutate_copy(*$gene*
.$x)"),all_fields_except_score)
  #eval(parse("$(T)("*join(all_fields_except_score,",")*")"))
  (("$(T)("*join(all_fields_except_score,",")*")"))
end

But that expands the gene in the string which is not what I want.