That's a great doc page. In the "Supported Code Changes" for C++ and C# it has a helpful list of what isn't supported too. Java also has the feature in the JVM (IDEs / mvn-hotswap plugin can hook into it), but it's similarly limited. There's a proprietary java agent called JRebel that significantly expands the support (https://jrebel.com/software/jrebel/features/comparison-matri...), and a couple open source versions I haven't tried, but it's still got some limitations.

It's worth a comparison to Common Lisp which thought about this feature a lot more and built it into the language rather than having it hacked in by external tools... e.g. if you redefine a class definition in Java say to add a new storage field, well you can't using default hotswap but with JRebel you can, but still any existing objects will continue to point to the "old class"'s code and the new field won't be available... Common Lisp defines a generic function 'update-instance-for-redefined-class that you extend before you do the class edit, and now your existing objects will work with the new code.

I had been exploring Lisp (in particular, Franz's Allegro Lisp and LispWorks Lisp) some years ago, and around the same time, came across the "edit and continue" feature in Visual C++ / Visual Studio (may have been 6 or other version). IIRC I blogged or tweeted about both, and that maybe that VC++ feature was inspired by something similar in Lisp.