Difference between revisions of "cpp/container/deque/emplace front"
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Latest revision as of 17:54, 11 November 2021
template< class... Args > void emplace_front( Args&&... args ); |
(since C++11) (until C++17) |
|
| template< class... Args > reference emplace_front( Args&&... args ); |
(since C++17) | |
Inserts a new element to the beginning of the container. The element is constructed through std::allocator_traits::construct, which typically uses placement-new to construct the element in-place at the location provided by the container. The arguments args... are forwarded to the constructor as std::forward<Args>(args)....
All iterators (including the end() iterator) are invalidated. No references are invalidated.
Contents |
[edit] Parameters
| args | - | arguments to forward to the constructor of the element |
| Type requirements | ||
-T (the container's element type) must meet the requirements of EmplaceConstructible.
| ||
[edit] Return value
| (none) | (until C++17) |
| A reference to the inserted element. | (since C++17) |
[edit] Complexity
Constant.
[edit] Exceptions
If an exception is thrown for any reason, this function has no effect (strong exception safety guarantee).
[edit] See also
| inserts an element to the beginning (public member function) |
