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ebb300d0b4
This used to work for non-class types (e.g. raw function pointers) in Eigen 3.3. This was changed in commit 11f55b29 to optimize the evaluator: > `sizeof((A-B).cwiseAbs2())` with A,B Vector4f is now 16 bytes, instead of 48 before this optimization. though I cannot reproduce the 16 byte result. Both before the change and after, with multiple compilers/versions, I always get a result of 40 bytes. https://godbolt.org/z/MsjTc1PGe This change modifies the code slightly to allow non-class types. The final generated code is identical, and the expression remains 40 bytes for the `abs2` sample case. Fixes #2251