Function cusparseZgtsv2_bufferSizeExt 

pub unsafe extern "C" fn cusparseZgtsv2_bufferSizeExt(
    handle: cusparseHandle_t,
    m: c_int,
    n: c_int,
    dl: *const cuDoubleComplex,
    d: *const cuDoubleComplex,
    du: *const cuDoubleComplex,
    B: *const cuDoubleComplex,
    ldb: c_int,
    bufferSizeInBytes: *mut size_t,
) -> cusparseStatus_t