Hello,
I'd like to ask a naive question about Rust/C FFI. Say I have a C struct
which, among other things, has a function pointer:
#[repr(C)]
struct CStruct {
data: libc::c_int,
callback: extern fn(libc::uint8_t)
}
And I would like to create an instance of this struct, but I would like to
make that function pointer be NULL. How should I set the callback field of
the struct so that C functions see a NULL pointer there? I have tried:
let cs = CStruct {
data: 0,
callback: ptr::null(),
};
As well as:
let cs = CStruct {
data: 0,
callback: mem::transmute(ptr::null()),
};
But both give compile errors. Any pointers (heh) about this problem?
Thanks for your help!
Frank
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