class A {
    string name;
    size_t num;
    unique_ptr<char[]> p;
public:
    void write(ostream& os) {
        os.write((char*)this, sizeof(a));
        os.write((char*))p.get(), num);
    }

There is a file made by write().

I open the file with ios::binary, and i try to get a lot of A with read().

void read(istream& is) {
    is.read(reinterpret_cast<char*>(this), sizeof(A));
    p = make_unique<char>(num);
    is.read(p.get(), num)
}

I can’t get any data with read() and program return abort() error.

I’d appreciate it if you could help me.