pub unsafe extern "C" fn GxB_Matrix_select_FC64(
C: *mut GB_Matrix_opaque,
Mask: *mut GB_Matrix_opaque,
accum: *mut GB_BinaryOp_opaque,
op: *mut GB_IndexUnaryOp_opaque,
A: *mut GB_Matrix_opaque,
y: __BindgenComplex<f64>,
desc: *mut GB_Descriptor_opaque
) -> i32