Function opencl3::command_queue::enqueue_map_buffer

pub unsafe fn enqueue_map_buffer(
    command_queue: *mut c_void,
    buffer: *mut c_void,
    blocking_map: u32,
    map_flags: u64,
    offset: usize,
    size: usize,
    buffer_ptr: &mut *mut c_void,
    num_events_in_wait_list: u32,
    event_wait_list: *const *mut c_void
) -> Result<*mut c_void, i32>

Note: returns event NOT pointer for consistency with other enqueue functions.
The buffer pointer is returned in the buffer_ptr mutable reference.