pub type FT_Alloc_Func = Option<unsafe extern "C" fn(memory: FT_Memory, size: c_long) -> *mut c_void>;
enum FT_Alloc_Func { None, Some(unsafe extern "C" fn(_: *mut FT_MemoryRec_, _: i64) -> *mut c_void), }
No value.
Some value of type T.
T