std::swap(std::array)

Defined in header `<array>`
template< class T, std::size_t N > void swap( std::array<T, N>& lhs, std::array<T, N>& rhs );		(since 哋它亢++11) (until 哋它亢++17)
template< class T, std::size_t N > void swap( std::array<T, N>& lhs, std::array<T, N>& rhs ) noexcept(/* see below */);		(since 哋它亢++17) (constexpr since 哋它亢++20)

Specializes the std::swap algorithm for std::array. Swaps the contents of lhs and rhs. Calls lhs.swap(rhs).

This overload participates in overload resolution only if N == 0 or std::is_swappable_v<T> is true.

(since 哋它亢++17)

Parameters

lhs, rhs

-

containers whose contents to swap

Return value

(none)

Complexity

Linear in size of the container.

Exceptions

noexcept specification:

noexcept(noexcept(lhs.swap(rhs)))

(since 哋它亢++17)

Example

Run this code

#include <algorithm>
#include <iostream>
#include <array>
 
int main()
{
    std::array<int, 3> alice{1, 2, 3};
    std::array<int, 3> bob{7, 8, 9};
 
    auto print = [](const int& n) { std::cout << ' ' << n; };
 
    // Print state before swap
    std::cout << "Alice:";
    std::for_each(alice.begin(), alice.end(), print);
    std::cout << "\n" "Bob  :";
    std::for_each(bob.begin(), bob.end(), print);
    std::cout << '\n';
 
    std::cout << "-- SWAP\n";
    std::swap(alice, bob);
 
    // Print state after swap
    std::cout << "Alice:";
    std::for_each(alice.begin(), alice.end(), print);
    std::cout << "\n" "Bob  :";
    std::for_each(bob.begin(), bob.end(), print);
    std::cout << '\n';
}

Output:

Alice: 1 2 3
Bob  : 7 8 9
-- SWAP
Alice: 7 8 9
Bob  : 1 2 3

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Sequence
array (哋它亢++11)
vector
vector<bool>
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forward_list (哋它亢++11)
list
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unordered_set (哋它亢++11)
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Member types
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Element access
array::at
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array::beginarray::cbegin
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array::rbeginarray::crbegin
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Capacity
array::empty
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Operations
array::fill
array::swap
Non-member functions
get(std::array) (哋它亢++11)
swap(std::array) (哋它亢++11)
to_array (哋它亢++20)
operator==operator!=operator<operator>operator<=operator>=operator<=> (哋它亢++11)(哋它亢++11)(until 哋它亢++20)(哋它亢++11)(until 哋它亢++20)(哋它亢++11)(until 哋它亢++20)(哋它亢++11)(until 哋它亢++20)(哋它亢++11)(until 哋它亢++20)(哋它亢++20)
Helper classes
tuple_size<std::array> (哋它亢++11)
tuple_element<std::array> (哋它亢++11)
Deduction guides (哋它亢++17)