Function GrB_Matrix_export_FP64 

pub unsafe extern "C" fn GrB_Matrix_export_FP64(
    Ap: *mut GrB_Index,
    Ai: *mut GrB_Index,
    Ax: *mut f64,
    Ap_len: *mut GrB_Index,
    Ai_len: *mut GrB_Index,
    Ax_len: *mut GrB_Index,
    format: GrB_Format,
    A: GrB_Matrix,
) -> GrB_Info