pub unsafe extern "C" fn GxB_init(
mode: GrB_Mode,
user_malloc_function: Option<unsafe extern "C" fn(arg1: usize) -> *mut c_void>,
user_calloc_function: Option<unsafe extern "C" fn(arg1: usize, arg2: usize) -> *mut c_void>,
user_realloc_function: Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: usize) -> *mut c_void>,
user_free_function: Option<unsafe extern "C" fn(arg1: *mut c_void)>,
) -> GrB_Info