>>6
Wrong. It's all about representations. You can access any objects representation (in C or C++) via (unsigned char *).
You can write these unsigned chars, and you can read them back, yes.

No, you can't replace read with fread or readv.

The standard does not describe any behavior of 'const void *' access? (wtf) to structures (wtf #2) and the (struct data *) + sizeof (struct data) (wtf #3, that's a constraint violation requiring a diagnostic message)

Both C and C++ guarantee that you can write and then read back bytes. (unsigned chars)

Operating systems have nothing to do with C or C++.

You stupid motherfucking piece of shit uselesss cocksucker.