The newly added Standard default constructor and _Get_index function are templates to avoid alternating DLL interface. (I'm still unsure whether this is sufficient or necessary.)

When a class is separately compiled, as class _CRTIMP2_PURE_IMPORT id is, then any ordinary member functions will be separately compiled and dllexported.

As always, you can check by running dumpbin /exports on the DLL and comparing before-and-after.

Edit: This change is special because of the default argument (review comment incoming).

Thanks! 🐈 I pushed a commit to fix bincompat, plus a couple of minor commits. This is moderately risky but I'm willing to roll the dice.

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

Looks like we avoided rolling snake eyes!

⛔ 🐍 🎲 🎲