[julia-users] How to create a composite type of function pointers

[J Luis]

Hi,

I need to convert a structure of function pointers into a composite type. 
The struct looks like this

struct cdCanvas {
  void   (*cxPixel)(cdCtxCanvas* ctxcanvas, int x, int y, long color);
  void   (*cxLine)(cdCtxCanvas* ctxcanvas, int x1, int y1, int x2, int y2);
  void   (*cxPoly)(cdCtxCanvas* ctxcanvas, int mode, cdPoint* points, int 
n);
...

used Clang.jl but it converted it to

type cdCanvas
    cxPixel::Ptr{Void}
    cxLine::Ptr{Void}
    cxPoly::Ptr{Void}
...

which is not correct (ccall crash when using this type), but I don't know 
either how to write it manually.

Any advise?

Thanks