[julia-users] Mutate in place packages

[Brandon Taylor]

I think I saw something about a mutate in place package. Specifically, I'm 
looking for a package to automatically create safe versions of functions 
like push! I've got a tiny macro if it doesn't exist elsewhere.


macro safe(f)
  esc(safe(f))
end

function safe(f::Symbol)
  f_string = string(f)
  if f_string[length(f_string)] != '!'
    error("Function must end in !")
  end
  f_chop = symbol(chop(f_string))
  :(function $f_chop(x, args...)
      x = copy(x)
      $f(x, args...)
    end)
end

@safe unshift!
Test.@test unshift([1, 2, 3], 1) == [1, 1, 2, 3]