Differences in API for Views and MultiViews

[rcarson3]

For an internal library I'm working to modernize, we've been transitioning over to either RAJA::View or RAJA::MultiView based on a compile time flag that our application codes would supply.

I've found this works relatively well as long as I'm only using the View::operator(...) function. Unfortunately, I do occasionally need to access the actual raw data from time to time as some of the older portions of the code still expect those. For the RAJA::View, this would be done using the get_data() but for the RAJA::MultiView type it appears that this function does not exist, and I would access the member data function directly. I was wondering if it might be possible to unify the behavior of these types so they have the same API for similar actions?

Also, I do realize that for the this raw pointer use case I'll still have to deal with the one fact one returns just a pointer and the other returns a pointer of pointers, but that's something I can work on internally within my library once I have a consistent API. I could probably have a free function deal with the differences before me in meantime though, but I just thought it was odd that the APIs between those two View types wasn't consistent for simple operations like the above.