C++

Suppose we implement the += operator as shown below:

void bag::operator +=(const bag& b) {

int I;

assert(size() + b.size() <= CAPACITY);

for (i=0; i

data[used] = b.data[i];

used=used+1;

}

}

What will go wrong with b+=b? Provide the correct implementation (do not use the copy function from cstdlib).