template< class T, class... Args > void emplace( Args&&... args ); | (1) | (since C++17) |
template< class T, class U, class... Args > void emplace( std::initializer_list<U> il, Args&&... args ); | (2) | (since C++17) |
Changes the contained object to one of type T constructed from the arguments.
First destroys the current contained object (if any) by reset(), then:
T, direct-non-list-initialized from std::forward<Args>(args)..., as the contained object. If std::is_constructible_v<T, Args...> is false, the behavior is undefined.T, direct-non-list-initialized from il, std::forward<Args>(args)..., as the contained object. This overload only participates in overload resolution if std::is_constructible_v<T, std::initializer_list<U>&, Args...> is true. Throws any exception thrown by T's constructor. If an exception is thrown, the previously contained object (if any) has been destroyed, and *this does not contain a value.
constructs an any object (public member function) |
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| destroys contained object (public member function) |
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