Writing and reading objects with virtual methods to a binary file?

Every time your program gets compiled it puts functions in different places in memory. Also, on some operating system configurations, functions might even move around every time you restart the program. It's a security feature called address space layout randomization.

If you know for sure that you will be reading and writing an object from the exact same binary, you might be able to do what you want by putting your read and write functions in the same program instead of two different ones. However, even this is fraught with the problem that if you make a change and recompile, you can no longer read your old data files anymore.

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