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# std::map::swap

From cppreference.com
< cpp‎ | container‎ | map

[edit template]

void swap( map& other ); |  | (until C++17)
void swap( map& other ) noexcept(/* see below */); |  | (since C++17)

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 `Pred` objects must be `Swappable`, and they are exchanged using unqualified call 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 of the `Compare` objects. | (until C++17)
`noexcept` specification: noexcept(std::allocator_traits<Allocator>::is_always_equal::value && std::is_nothrow_swappable<Compare>::value) | (since C++17)

### [edit] Complexity

Constant.

### [edit] See also

std::swap(std::map) | specializes the std::swap algorithm (function template) [edit]

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Category:

- conditionally noexcept