The source project of this merge request has been removed.
Bug #1788: Fix rule-of-three violations.
Actually, protecting the destructors (of MatrixBase and ArrayBase) lets the boost_multiprecision unit tests fail. I guess this part of the patch could just be removed (it only adds a tiny bit of extra security).
The #pragma GCC diagnostic ignored "-Wdeprecated-copy" could also be put into the global DisableStupidWarnings header.
For the 3.3 branch, I would just add the #pragma