[julia-users] How can I do something when an object is deallocated?

[Dawei Si]

I'm writing a program in julia with an C library that provides "new" and 
"free" function, and I want to store a pointer in my custom type in julia. 
When an instance of the type is created it will create an object in the C 
library, but how can I free it when the object in julia is deallocated?