Is it possible to have out params / replace type and data referenced by sol::object? about sol2

[Rochet2]

What you want to do in your example may be possible, but not exactly supported by lua.
You would need to use the debug library to replace the value of local variables.
See https://www.lua.org/manual/5.1/manual.html#pdf-debug.setlocal

For some alternative approaches see #1323 (comment)

[shohnwal]

Oh, dumb me, I totally forgot that primitives get passed by value.
Never mind then, I'll just use the variadic_results approach then.

Thank you for the links! :)