[HP48] Memory Management

[David Hayden]

I don't think you can do this in userRPL. In systemRPL it may be possible to modify the data in place. However, if the size of the array changes, then it's definitely not possible.

RPL lets you have multiple pointers to objects, but then what happens if you change the object? You don't want to change the data that something else (like a stack level, or a local variable) is pointing to. RPL handles this in (at least) 3 ways: first, most operations create a new object, so objects are mostly "read only." Second, sometimes if will check to see if an object has multiple references to it and modify it in-place if not. Third, the words that do modify an object in-place usually start with "!" and are called "bang type" operators.