decompiling back to C++?

Certainly, it would be impossible to get the exact code, just as the programmers had written it. The code optimizations made by the compiler make this impossible.

You may get a C/C++ code, but it would be impossible to read. Have you tried to read a simple program written by a bad programmer? I'm a student and I had got to check some codes from other students, on their first programming course. Even if you know what the code should do, it's really hard to understand everything.

I think this would happen if you get something from ASM to C++. It would be a big mess. Maybe everything got sense thinking about classes, with functions making specific tasks. Now think the compiler will make a "few" changes. Then put it into assembler. Taking it back to C would complicate the things even more.

Why would you want to get SOME (and not THE) C code from a program? I still don't see what is the idea behind this.