std::swap(std::array) - cppreference.com (original) (raw)
| Defined in header | | | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | ------------------------------------- | | template< class T, std::size_t N > void swap( std::array<T, N>& lhs, std::array<T, N>& rhs ); | | (since C++11) (until C++17) | | template< class T, std::size_t N > void swap( std::array<T, N>& lhs, std::array<T, N>& rhs ) noexcept(/* see below */); | | (since C++17) (constexpr since C++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 C++17) |
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[edit] Parameters
| lhs, rhs | - | containers whose contents to swap |
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[edit] Complexity
Linear in size of the containers.
Exceptions
| noexcept specification: noexcept(noexcept(lhs.swap(rhs))) | (since C++17) |
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[edit] Example
#include #include #include 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 << "\nBobby:"; 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 << "\nBobby:"; std::for_each(bob.begin(), bob.end(), print); std::cout << '\n'; }
Output:
Alice: 1 2 3 Bobby: 7 8 9 -- SWAP Alice: 7 8 9 Bobby: 1 2 3
[edit] See also
| | swaps the contents (public member function) [edit] | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |