true c++ code?
i wouldn't say impossible, but improbable.

decompilers will deal with the lost of code due to optimizations, and of course, the user-defined tokens (ex. variables, function names).

reusable code should be the target of decompilers, and until someone creates a program to analyze algorithms, and properly name all of the variables and functions, not to mention profiling the programmer on his/her preferences in the use of variables, we're still a long way to go before seeing the original code from a compiled sample.