More extras to make your programs safer and quicker and easier to write.
Defaulted constructors and =
Earlier I avoided using the defaults for constructors and operator=, because sometimes C++’s guess is wildly wrong; specifically, it copies array addresses rather than their contents.
But sometimes it’s exactly right. Defaults can save us a little time writing the Card class from Chapter 19 (see Example 26-1).
class Card
{
public:
Card () : rank_(Rank(0)), suit_(Suit(0)) {}
Card (const Card& other) = default;
Card& operator= (const Card& other) = default;
