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How can it has a output

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Reference no: EM131103294

Here is a struct clarification:

struct Target {

std::ostream &out;

std:: string name;

Target(const std::string &name, std ::ostream &out = std::cout;

bool isLeaf() const;
....
};

I wonder what is the field "out" use for? Instructors comment it "// stream where Target will prints its output". Target is not a function, how can it has a output? I also confused about "std::ostream &out = std::cout", don't understand what is it doing.

Reference no: EM131103294

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