C++二进制文件中读写bitset

bitset< 32> *b = new bitset<32>(255);
bitset< 32> *c = new bitset<32>(0);
ofstream out("I:\\test.dat",ios::binary);
out.write((char *)b,4);
out.close();
ifstream in("I:\\test.dat", ios::binary);
for (int i = 0; i < c[0].size();)
{
    char temp = 0;
    in.read(&temp, sizeof(char));
    for (int j = 0; j < 8; j++)
    {
        bool flag = (bool)((temp >> j) & 1);
        if (flag)
            c[0].set(i + j);
    }
    i = i + 8;
}
cout << "位图读取就位" << endl;
cout << c[0] << endl;
in.close();

delete b;
delete c;