C++ Primer Plus

Assignment

The same considerations that make move semantics appropriate for constructors make them appropriate for assignment. Here, for example, is how you could code the copy assignment and the move assignment operators for the Useless class:

Useless & Useless::operator=(const Useless & f)  // copy assignment{    if (this == &f)        return *this;    delete [] pc;    n = f.n;    pc = new char[n];    for (int i = 0; i < n; i++)        pc[i] = f.pc[i];    return *this;}Useless & Useless::operator=(Useless && f)       // move assignment{    if (this == &f)        return *this;    delete [] pc;    n = f.n;    pc = f.pc;    f.n = 0;    f.pc = nullptr;    return *this;}

The copy assignment operator follows the usual pattern given in Chapter 12 ...