c++ primer exercise 15.26

**frank67** · 09-18-2015

Hello everybody!

This is my first post here so I hope that all will be ok, otherwise please be patients

I've trouble defining the copy-control move assignment of a derived class, it should be trivial however I don't know how to call the base class move assignment (should I?) the code I wrote is here.
The concerned part is:

Code:

// Move assignment
Bulk_quote& Bulk_quote::operator=(Bulk_quote&& q) noexcept
{
    if(this != &q)
    {
        *this=Quote::operator=(q); // <---- !!!???
        min_qty=q.min_qty;    discount=q.discount;
        cout    << "Class: "    << (typeid(*this).name())    << ", Move assigment"    << endl;
    }
    return *this;
}

Could anybody give me some hints? Thank in advance

**Elysia** · 09-18-2015

To call the base class operator =, all you need to do this is write
BaseClass:

perator = (q);
In this case, BaseClass would be Quote. It tells the compiler to call operator =, but by default, it calls the one in the current class you're defining it in (e.g. Bulk_quote), so you need to prefix it with the base class's name to distinguish it.
If you want to call the base class's move assignment operator, you need to write
BaseClass:

perator = (std::move(q));

Do not assign the return value to *this. The base class's operator = already moves or copies the state into *this. That's its job.

**frank67** · 09-18-2015

Originally Posted by Elysia

The base class's operator = already moves or copies the state into *this. That's its job.

Yes, because Quote object is returned as reference in the copy/move assignment operator.

I apologize, it was really easy to understood. Thanks Elysia.

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