20 Memory management library [mem]

20.3 Smart pointers [smartptr]

20.3.1 Unique-ownership pointers [unique.ptr]

20.3.1.7 I/O [unique.ptr.io]

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template<class E, class T, class Y, class D> basic_ostream<E, T>& operator<<(basic_ostream<E, T>& os, const unique_ptr<Y, D>& p);
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Constraints: os << p.get() is a valid expression.
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Effects: Equivalent to: os << p.get();
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Returns: os.