Question

I have a structure, that contain string. Something like that:

struct Chunk {
int a;
string b;
int c;
};

So, i suppose, that i cannot write and read this structure from file using fread and fwrite functions. Because string may reserve different memory capacity.
But such code works correctly.

Chunk var;

fwrite(&var, sizeof(Chunk), 1, file);

fread(&var, sizeof(Chunk), 1, file);

Is there really some problems in it?

Answer 1

You are justified in doubting this. You should only stream POD types with fwrite and fread and string is not POD.