CODEWITHSUNDEEP
c++
Anycorn
Anycorn

Reputation: 51465

C++ constant temporary lifetime

Can you please tell me if such code is correct (according to standard):

struct array {
    int data[4];
    operator const int*() const { return data; }
};

void function(const int*) { ... }

function(array()); // is array data valid inside function?

Thank you

Upvotes: 7

Views: 261

Answers (2)

Mike Seymour
Mike Seymour

Reputation: 254431

Yes. The temporary object is valid until the end of the full expression in which it is created; that is, until after the function call returns.

I don't have my copy of the standard to hand, so I can't give the exact reference; but it's in 12.2 of the C++0x final draft.

Upvotes: 12

Tyler McHenry
Tyler McHenry

Reputation: 76660

Yes. Temporaries are valid until the end of the full expression in which they are created. Therefore the nameless array temporary would be valid until the call to function returns, and so its data member would be as well.

Upvotes: 6

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