struct passed between algorithms cannot contain an enum

[wddgit]

While implementing a version of the GausHitFinder algorithm, I tried to pass a type out of an unfold that contained an enum defined in LArSoft as a data member. This caused a static_assert in phlex to fail:

Line 232 in phlex/model/type_id.hpp

static_assert(std::is_fundamental_v<basic> || std::is_array_v<basic> ||
                      std::is_class_v<basic>,
                    "Taking type_id of an unsupported type");

I worked around this by making the data member an int and using a cast a couple places.

Is this an intentional restriction or something that needs to be improved in a future development?

[knoepfel]

Is this an intentional restriction or something that needs to be improved in a future development?

We should not be placing such constraints on the user's data model. I suspect the static_assert(...) can be adjusted to also include std::is_enum_v<basic>.