FFI - memory management issues

[mantielero]

I did:
    
    
    proc `+`*(clip1:sink VSMapObj, clip2:sink VSMapObj):VSMapObj =
    
    
    Run

without success:
    
    
    /home/jose/src/nimlang/vs.nim/tests/ex06_adding.nim(6, 11) Error: '=dup' is 
not available for type <VSMapObj>, which is inferred from unavailable '=copy'; 
requires a copy because it's not the last read of 'c1'; routine: ex06_adding
    
    
    Run

Regarding option 2, I understand you mean something like:
    
    
    type
      VSMapRef = ref VSMapObj
    
    
    Run