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std::vector::emplace

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< cpp‎ | container‎ | vector
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template< class... Args >
iterator emplace( const_iterator pos, Args&&... args );
(since C++11)

Inserts a new element into the container directly before pos. The element is constructed in-place, i.e. no copy or move operations are performed. The constructor of the element is called with the arguments std::forward<Args>(args).... The element type must be EmplaceConstructible, MoveInsertable and MoveAssignable.

If the new size() is greater than capacity(), all iterators and references are invalidated. Otherwise, only the iterators and references before the insertion point remain valid. The past-the-end iterator is also invalidated.

Contents

[edit] Parameters

pos - iterator before which the new element will be constructed
args - arguments to forward to the constructor of the element

[edit] Return value

Iterator pointing to the emplaced element.

[edit] Complexity

Linear in the distance between pos and end of the container.

[edit] Exceptions

If an exception is thrown (e.g. by the constructor), the container is left unmodified, as if this function was never called (strong exception guarantee).

Notes

The specialization std::vector<bool> did not have emplace() member until C++14.

[edit] See also

inserts elements
(public member function) [edit]