22 General utilities library [utilities]

22.7 Storage for any type [any]

22.7.4 Class any [any.class]

22.7.4.3 Assignment [any.assign]

any& operator=(const any& rhs);
Effects: As if by any(rhs).swap(*this).
No effects if an exception is thrown.
Returns: *this.
Throws: Any exceptions arising from the copy constructor for the contained value.
any& operator=(any&& rhs) noexcept;
Effects: As if by any(std​::​move(rhs)).swap(*this).
Postconditions: The state of *this is equivalent to the original state of rhs.
Returns: *this.
template<class T> any& operator=(T&& rhs);
Let VT be decay_­t<T>.
Constraints: VT is not the same type as any and is_­copy_­constructible_­v<VT> is true.
Preconditions: VT meets the Cpp17CopyConstructible requirements.
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.
Returns: *this.
Throws: Any exception thrown by the selected constructor of VT.