[util.smartptr.shared.mod]

constexpr void swap(shared_ptr& r) noexcept;

Effects: Exchanges the contents of *this and r.

constexpr void reset() noexcept;

Effects: Equivalent to shared_ptr().swap(*this).

template<class Y> constexpr void reset(Y* p);

Effects: Equivalent to shared_ptr(p).swap(*this).

template<class Y, class D> constexpr void reset(Y* p, D d);

Effects: Equivalent to shared_ptr(p, d).swap(*this).

template<class Y, class D, class A> constexpr void reset(Y* p, D d, A a);

Effects: Equivalent to shared_ptr(p, d, a).swap(*this).

20 Memory management library [mem]