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std::experimental::optional::emplace

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< cpp‎ | experimental‎ | optional
Revision as of 10:03, 19 March 2014 by 163.5.141.52 (Talk)

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template< class... Args >
void emplace( Args&&... args );
(library fundamentals TS)
template< class U, class... Args >
void emplace( std::initializer_list<U> ilist, Args&&... args );
(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) Initializes the contained value by calling its constructor with ilist and args... as parameters.

Contents

[edit] 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...
-
T must be constructible from std::initializer_list and Args...

[edit] Return value

(none)

[edit] Exceptions

Any exception thrown by the selected constructor of T. If an exception is thrown, *this is in disengaged state after the call.

[edit] See also

assigns contents
(public member function) [edit]