20 General utilities library [utilities]

20.8 Storage for any type [any]

20.8.3 Class any [any.class]

20.8.3.2 Assignment [any.assign]

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any& operator=(const any& rhs);
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Effects: As if by any(rhs).swap(*this).
No effects if an exception is thrown.
2
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Returns: *this.
3
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Throws: Any exceptions arising from the copy constructor for the contained value.
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any& operator=(any&& rhs) noexcept;
4
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Effects: As if by any(std​::​move(rhs)).swap(*this).
5
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Returns: *this.
6
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Postconditions: The state of *this is equivalent to the original state of rhs.
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template<class T> any& operator=(T&& rhs);
7
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Let VT be decay_­t<T>.
8
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Constraints: VT is not the same type as any and is_­copy_­constructible_­v<VT> is true.
9
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Preconditions: VT meets the Cpp17CopyConstructible requirements.
10
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Effects: Constructs an object tmp of type any that contains an object of type VT direct-initialized with std​::​forward<T>(rhs), and tmp.swap(*this).
No effects if an exception is thrown.
11
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Returns: *this.
12
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Throws: Any exception thrown by the selected constructor of VT.