device policy "dpcpp_fpga" not found in namespace

Hi @arnoecho,

Thanks for the details explanation and patients.

Based on the error mention my guess is just a missing definition cause the namespace not found.

You may refer to the link below which contain the guide to defined the required namespace based on the oneAPI execution policy.

https://oneapi-src.github.io/oneDPL/parallel_api/execution_policies.html

Hope that clarify.

Regards

BB