pub unsafe extern "C" fn GrB_Matrix_extract(
C: *mut GB_Matrix_opaque,
Mask: *mut GB_Matrix_opaque,
accum: *mut GB_BinaryOp_opaque,
A: *mut GB_Matrix_opaque,
I: *const u64,
ni: u64,
J: *const u64,
nj: u64,
desc: *mut GB_Descriptor_opaque
) -> i32