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Showing content from https://cplusplus.github.io/LWG/issue2551 below:

[fund.ts.v2] "Exception safety" cleanup in library fundamentals required

template<class Y> explicit shared_ptr(Y* p);

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-3- Effects: When T is not an array type, constructs a shared_ptr object that owns the pointer p. Otherwise, constructs a shared_ptr that owns p and a deleter of an unspecified type that calls delete[] p. If an exception is thrown, delete p is called when T is not an array type, delete[] p otherwise. […] -6- Exception safety: If an exception is thrown, delete p is called when T is not an array type, delete[] p otherwise.

template<class Y, class D> shared_ptr(Y* p, D d);
template<class Y, class D, class A> shared_ptr(Y* p, D d, A a);
template <class D> shared_ptr(nullptr_t p, D d);
template <class D, class A> shared_ptr(nullptr_t p, D d, A a);

[…]

-9- Effects: Constructs a shared_ptr object that owns the object p and the deleter d. The second and fourth constructors shall use a copy of a to allocate memory for internal use. If an exception is thrown, d(p) is called. […] -12- Exception safety: If an exception is thrown, d(p) is called.

[…]

template<class Y> explicit shared_ptr(const weak_ptr<Y>& r);

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-28- Effects: Constructs a shared_ptr object that shares ownership with r and stores a copy of the pointer stored in r. If an exception is thrown, the constructor has no effect. […] -31- Exception safety: If an exception is thrown, the constructor has no effect.

template <class Y, class D> shared_ptr(unique_ptr<Y, D>&& r);

[…]

-34- Effects: Equivalent to shared_ptr(r.release(), r.get_deleter()) when D is not a reference type, otherwise shared_ptr(r.release(), ref(r.get_deleter())). If an exception is thrown, the constructor has no effect. -35- Exception safety: If an exception is thrown, the constructor has no effect.

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