Hello.
As I can see, there is no address type. The suggested conversion for C
pointers (POINTER : vol Conversion) converts a C pointer to "vol".
As follows from
http://www.polyml.org/docs/CInterface.html#17%20Volatile%20Implementation
, "vol" contains an address of a heap object. If its boolean field
"owns" is true, it garbage-collects its heap object.
If a C library requires that freeing a heap object be done explicitely,
managing an address to that heap object by "vol" is inefficient and
confusing. A "vol" value contains an index of the element of the "vols"
array which contains an address of a memory block which contains an
address of the heap object. What I really need is an ML integer type
that is wide enough to hold a C pointer; I called it "address type".
I'm trying to create a binding to the XCB library (
http://xcb.freedesktop.org/ ). Some functions from XCB don't manage
memory (so the Poly/ML garbage collector may be used); some functions
are allocating objects, and those objects must be freed by the function
"free" or "xcb_disconnect".
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