template <class T, class... Args> T& emplace(Args&&... args);
Let I be the zero-based index of T in Types....
Effects: Equivalent to: return emplace<I>(std::forward<Args>(args)...);
Remarks: This function shall not participate in overload resolution unless is_constructible_v<T, Args...> is true, and T occurs exactly once in Types....
template <class T, class U, class... Args> T& emplace(initializer_list<U> il, Args&&... args);
Let I be the zero-based index of T in Types....
Effects: Equivalent to: return emplace<I>(il, std::forward<Args>(args)...);
Remarks: This function shall not participate in overload resolution unless is_constructible_v<T, initializer_list<U>&, Args...> is true, and T occurs exactly once in Types....
template <size_t I, class... Args> variant_alternative_t<I, variant<Types...>>& emplace(Args&&... args);
Requires: I < sizeof...(Types).
Effects: Destroys the currently contained value if valueless_by_exception() is false. Then initializes the contained value as if direct-non-list-initializing a value of type TI with the arguments std::forward<Args>(args)....
Postconditions: index() is I.
Returns: A reference to the new contained value.
Throws: Any exception thrown during the initialization of the contained value.
Remarks: This function shall not participate in overload resolution unless is_constructible_v<TI, Args...> is true. If an exception is thrown during the initialization of the contained value, the variant might not hold a value.
template <size_t I, class U, class... Args> variant_alternative_t<I, variant<Types...>>& emplace(initializer_list<U> il, Args&&... args);
Requires: I < sizeof...(Types).
Effects: Destroys the currently contained value if valueless_by_exception() is false. Then initializes the contained value as if direct-non-list-initializing a value of type TI with the arguments il, std::forward<Args>(args)....
Postconditions: index() is I.
Returns: A reference to the new contained value.
Throws: Any exception thrown during the initialization of the contained value.
Remarks: This function shall not participate in overload resolution unless is_constructible_v<TI, initializer_list<U>&, Args...> is true. If an exception is thrown during the initialization of the contained value, the variant might not hold a value.
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