std::unordered_set::swap - cppreference.com

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# std::unordered_set::swap

From cppreference.com
< cpp‎ | container‎ | unordered set

[edit template]

void swap( unordered_set& other ); |  | (since C++11)

Exchanges the contents of the container with those of `other`. Does not invoke any move, copy, or swap operations on individual elements.

All iterators and references remain valid. The past-the-end iterator is invalidated.

The `Hash` and `KeyEqual` objects must be `Swappable`, and they are exchanged using unqualified calls to non-member `swap`. If std::allocator_traits<allocator_type>::propagate_on_container_swap::value is true, then the allocators are exchanged using an unqualified call to non-member `swap`. Otherwise, they are not swapped (and if get_allocator() != other.get_allocator(), the behavior is undefined). (since C++11)

### [edit] Parameters

other | - | container to exchange the contents with

### [edit] Return value

(none)

### [edit] Exceptions

Any exception thrown by the swap `Hash` or `KeyEqual` objects.

### [edit] Complexity

Constant.

### [edit] See also

std::swap(std::unordered_set) (C++11) | specializes the std::swap algorithm (function template) [edit]

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