fl wrote:
> Hi,
> I browse through C++ primer. I have a question about the calling of
> copy constructor in the example of that book. Below, "item" is an
> associate container. In main func, there is a call of add_item. From
> debug, I see add_item calls "Sales_item(const Sales_item &i)". My
> question is: why add_item calls the copy constructor. To you, it may
> be very easy. For a beginner like me, I don't know now. Could you give
> me an explanation about that? Thanks in advance.
>
>
>
>
>
> .........................
> class Basket {
> ...
> public:
> ...
> void add_item(const Sales_item &item)
> {items.insert(item); }

'std::multiset' makes copies of things that you insert. That's
just how all standard containers work.

>
> private:
> std::multiset<Sales_item, Comp> items;
> };
> ...

V
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