Function rocks_sys::rocks_writebatch_merge_cf

pub unsafe extern "C" fn rocks_writebatch_merge_cf(
    b: *mut rocks_writebatch_t, 
    column_family: *mut rocks_column_family_handle_t, 
    key: *const c_char, 
    klen: usize, 
    val: *const c_char, 
    vlen: usize
)