CODEWITHSUNDEEP
c++
CantThinkOfAnything
CantThinkOfAnything

Reputation: 1179

difference between copy constructors?

I am reading C++ Primer and this piece of code confuses me a little. Maybe i have read before but forgotten what its about.

this code has 2 copy constructors but i dont know what the difference is between them

class Quote {
public:
    Quote() = default;
    Quote(const Quote&) = default;    // <<== this one
    Quote(Quote&&) = default;         // <<== and this one
    Quote& operator=(const Quote&) = default;
    Quote& operator=(Quote&&) = default;
    virtual ~Quote() = default;
}

what is the difference in general?

and what do the double "&" mean?

Upvotes: 0

Views: 85

Answers (1)

Ionut
Ionut

Reputation: 6866

They are not both copy constructors, only the first one: Quote(const Quote&) = default;. The second one is a move constructor, do some reading on move semantics and C++11.

Upvotes: 4

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