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val t : t Ctypes.typ
A type representation for a function pointer type with explicit lifetime management.
val t_opt : t option Ctypes.typ
This behaves like
t, except that null pointers appear in OCaml as
val free : t -> unit
Indicate that the
fptr is no longer needed.
free has been called any C calls to this
Dynamic_funptr.t are unsafe. Only call
free once the callback is no longer used from C.
Turn an OCaml closure into a function pointer that can be passed to C.
The function pointer returned by
of_fun should be deallocated by a call to
free once it is no longer in use. Failure to call
free is an error.
with_fun encapsulates both allocation and deallocation.
Implementation detail: to avoid crashes, if
free is not called then the implementation will retain a reference to the OCaml closure and report a warning. See
with_fun fn (fun fptr -> e) - Turn an OCaml closure into a function pointer and perform simple life cycle management.
with_fun fn (fun fptr -> e) will call
free fptr after
with_fun is not safe to use if the C function ptr
fptr may still be used after