template <class T, class... Args> decay_t<T>& emplace(Args&&... args);
Requires: VT shall satisfy the CopyConstructible requirements.
Effects: Calls reset(). Then initializes the contained value as if direct-non-list-initializing an object of type VT with the arguments std::forward<Args>(args)....
Postconditions: *this contains a value.
Returns: A reference to the new contained value.
Throws: Any exception thrown by the selected constructor of VT.
Remarks: If an exception is thrown during the call to VT's constructor, *this does not contain a value, and any previously contained value has been destroyed. This function shall not participate in overload resolution unless is_copy_constructible_v<VT> is true and is_constructible_v<VT, Args...> is true.
template <class T, class U, class... Args> decay_t<T>& emplace(initializer_list<U> il, Args&&... args);
Requires: VT shall satisfy the CopyConstructible requirements.
Effects: Calls reset(). Then initializes the contained value as if direct-non-list-initializing an object of type VT with the arguments il, std::forward<Args>(args)....
Postconditions: *this contains a value.
Returns: A reference to the new contained value.
Throws: Any exception thrown by the selected constructor of VT.
Remarks: If an exception is thrown during the call to VT's constructor, *this does not contain a value, and any previously contained value has been destroyed. The function shall not participate in overload resolution unless is_copy_constructible_v<VT> is true and is_constructible_v<VT, initializer_list<U>&, Args...> is true.
void reset() noexcept;
Effects: If has_value() is true, destroys the contained value.
Postconditions: has_value() is false.
void swap(any& rhs) noexcept;
Effects: Exchanges the states of *this and rhs.
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