# Exporting structs and functions

**URL:** <https://discourse.julialang.org/t/exporting-structs-and-functions/78133>\
**Category:** New to Julia\
**Created:** [March 19, 2022, 3:51pm UTC](https://discourse.julialang.org/t/exporting-structs-and-functions/78133 "2022-03-19T15:51:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![imantha](https://avatars.discourse-cdn.com/v4/letter/i/6a8cbe/32.png) [@imantha](https://discourse.julialang.org/u/imantha)\
**Post date:** [March 19, 2022, 3:51pm UTC](https://discourse.julialang.org/t/exporting-structs-and-functions/78133/1 "2022-03-19T15:51:16Z")

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Hi,  
I am having a little trouble when exporting Structs and functions across several julia files.

Here is an example

```julia
# --- agent_type.jl ---
module Agent_Type

using Agents: AbstractAgent

export Casualty
mutable struct Casualty <: AbstractAgent
    id :: Int
    pos :: Tuple{Int,Int}
    trauma :: Int
    rescued :: Bool

    function Casualty(id,pos;trauma=2,rescued=false)
        new(id,pos,trauma,rescued)
    end

end
end

```

```julia
# --- ammend_props.jl ---
module Ammend_Props
    include("agent_type.jl")
    using .Agent_Type: Casualty

    function ammend_cas_properties(cas::Casualty, val::Any)
        cas.rescued = val
        return cas
    end

end

```

```julia
# -- main.jl ---
begin
    using Pkg
    Pkg.activate(joinpath(homedir(),"workspace","julia","envs","agentsenv"))
end

include("agent_type.jl")
include("ammend_props.jl")

using .Agent_Type: Casualty
using .Ammend_Props: ammend_cas_properties

cas1 = Casualty(1, (7,7), trauma = 3)

ammend_cas_properties(cas1, true)
>>>
ERROR: MethodError: no method matching ammend_cas_properties(::Casualty, ::Bool)
Closest candidates are:
  ammend_cas_properties(::Main.Ammend_Props.Agent_Type.Casualty, ::Any) at ~/github/CRTT-lite/test/ammend_props.jl:5
Stacktrace:
 [1] top-level scope
   @ ~/github/CRTT-lite/test/test_main.jl:15

```

Any particular way I can avoid this by exporting `Casualty` instead of `Main.Ammend_Props.Agent_Type.Casualty`

---

<div class="post-metadata">

**Author:** ![rdeits](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rdeits/32/286_2.png) [@rdeits](https://discourse.julialang.org/u/rdeits)\
**Post date:** [March 19, 2022, 4:46pm UTC](https://discourse.julialang.org/t/exporting-structs-and-functions/78133/2 "2022-03-19T16:46:41Z")

</div>

The short answer is that you need to `include` each file _exactly once_. Including a file multiple times (once via `ammend_props.jl` and again via `main.jl`) creates completely different types and functions that happen to have the same names, which is never what you want. I posted a few relevant answers back on this older thread that might be helpful: [Modules and namespaces - #5 by rdeits](https://discourse.julialang.org/t/modules-and-namespaces/45027/5)

In your case, you could delete `include("agent_type.jl")` from `Ammend_Props` and instead just do `using ..AgentType: Causality` (note the `..` instead of `.` since you’d be referring to the `AgentType` module in the _parent_ `Main`.