use `Ref{Clong}` for the calling convention to pass an auto-allocated boxed
c-long.
it's usually best to avoid `pointer` and `pointer_from_objref`. memory is
not "guaranteed by julia": it will be cleaned up as soon as the gc detects
that you are no longer referencing the julia object. using
Thanks Jameson,
I want to later use `x` in auto-generated expressions, and if it's a Ref I
will have to use `x.x` to get the actual data which makes generating the
expressions more tricky, I thought I could perhaps avoid it.
Here's a more complete snippet:
~~~
type Foo
x::Int64
I still have no idea what you are trying to do, but punning on types like
your example shows is going to get you in deep trouble with both Julia and
C. (using Expr and quoted ASTs will also cause you issues, but for
completely different reasons).
```
type Foo
x::Clong
y::Vector{Clong}
end
