20 General utilities library [utilities]

20.11 Smart pointers [smartptr]

20.11.1 Class template unique_ptr [unique.ptr]

20.11.1.7 I/O [unique.ptr.io]

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);

Constraints: os << p.get() is a valid expression.

Effects: Equivalent to: os << p.get();

Returns: os.