20 Memory management library [mem]

20.4 Types for composite class design [mem.composite.types]

20.4.2 Class template polymorphic [polymorphic]

20.4.2.6 Observers [polymorphic.obs]

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constexpr const T& operator*() const noexcept; constexpr T& operator*() noexcept;
1
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Preconditions: *this is not valueless.
2
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Returns: A reference to the owned object.
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constexpr const_pointer operator->() const noexcept; constexpr pointer operator->() noexcept;
3
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Preconditions: *this is not valueless.
4
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Returns: A pointer to the owned object.
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constexpr bool valueless_after_move() const noexcept;
5
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Returns: true if *this is valueless, otherwise false.
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constexpr allocator_type get_allocator() const noexcept;
6
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Returns: alloc.