pub type clSetKernelExecInfo_fn = Option<unsafe extern "C" fn(*mut c_void, u32, usize, *const c_void) -> i32>;
pub enum clSetKernelExecInfo_fn { None, Some(unsafe extern "C" fn(*mut c_void, u32, usize, *const c_void) -> i32), }
No value.
Some value of type T.
T