23 General utilities library [utilities]

23.8 Storage for any type [any]

23.8.3 Class any [any.class]

23.8.3.2 Assignment [any.assign]

any& operator=(const any& rhs);

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Effects: As if by any(rhs).swap(*this). No effects if an exception is thrown.

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Returns: *this.

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Throws: Any exceptions arising from the copy constructor for the contained value.

any& operator=(any&& rhs) noexcept;

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Effects: As if by any(std​::​move(rhs)).swap(*this).

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Returns: *this.

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Postconditions: The state of *this is equivalent to the original state of rhs and rhs is left in a valid but otherwise unspecified state.

template<class T> any& operator=(T&& rhs);

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Let VT be decay_­t<T>.

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Requires: VT shall satisfy the CopyConstructible requirements.

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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.

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Returns: *this.

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Remarks: This operator shall not participate in overload resolution unless VT is not the same type as any and is_­copy_­constructible_­v<VT> is true.

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Throws: Any exception thrown by the selected constructor of VT.