20 Memory management library [mem]

20.3 Smart pointers [smartptr]

20.3.2 Shared-ownership pointers [util.sharedptr]

20.3.2.2 Class template shared_ptr [util.smartptr.shared]

20.3.2.2.8 Comparison [util.smartptr.shared.cmp]

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template<class T, class U> constexpr bool operator=(const shared_ptr<T>& a, const shared_ptr<U>& b) noexcept;
1
#
Returns: a.get() == b.get().
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template<class T> constexpr bool operator=(const shared_ptr<T>& a, nullptr_t) noexcept;
2
#
Returns: !a.
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template<class T, class U> constexpr strong_ordering operator<=>(const shared_ptr<T>& a, const shared_ptr<U>& b) noexcept;
3
#
[Note 1: 
Defining a comparison operator function allows shared_ptr objects to be used as keys in associative containers.
— end note]
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template<class T> constexpr strong_ordering operator<=>(const shared_ptr<T>& a, nullptr_t) noexcept;
5
#
Returns: compare_three_way()(a.get(), static_cast<typename shared_ptr<T>::element_type*>(nullptr)

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