std::experimental::optional<T>::emplace
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template< class... Args >
void emplace( Args&&... args );
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(library fundamentals TS) | |
template< class U, class... Args >
void emplace( std::initializer_list<U> ilist, Args&&... args );
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(library fundamentals TS) | |
Constructs the contained value in-place. If *this is in engaged state before the call, the contained value is destroyed by calling its destructor.
1) Initializes the contained value by calling its constructor with
args... as parameters.2) Inilializes the contained value by calling its constructor with
ilist and args... as parameters.Parameters
| args... | - | the arguments to pass to the constructor |
| ilist | - | the initializer list to pass to the constructor |
| Type requirements | ||
-T must be constructible from Args...
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-T must be constructible from std::initializer_list and Args...
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Return value
(none)
Exceptions
Any exception thrown by the selected constructor of T. If an exception is thrown, *this is in disengaged state after the call.
See also
| assigns contents (public member function) |