Function GxB_Matrix_export_FC64 

pub unsafe extern "C" fn GxB_Matrix_export_FC64(
    Ap: *mut GrB_Index,
    Ai: *mut GrB_Index,
    Ax: *mut GxB_FC64_t,
    Ap_len: *mut GrB_Index,
    Ai_len: *mut GrB_Index,
    Ax_len: *mut GrB_Index,
    format: GrB_Format,
    A: GrB_Matrix,
) -> GrB_Info