std::swap(std::vector)
From cppreference.com
| Defined in header <vector>
|
||
template< class T, class Alloc > void swap( std::vector<T, Alloc>& lhs, std::vector<T, Alloc>& rhs ); |
(until C++17) | |
template< class T, class Alloc > void swap( std::vector<T, Alloc>& lhs, std::vector<T, Alloc>& rhs ) noexcept(/* see below */); |
(since C++17) (constexpr since C++20) |
|
Specializes the std::swap algorithm for std::vector. Swaps the contents of lhs and rhs. Calls lhs.swap(rhs).
Parameters
| lhs, rhs | - | containers whose contents to swap |
Return value
(none)
Complexity
Constant.
Exceptions
|
noexcept specification:
noexcept(noexcept(lhs.swap(rhs))) |
(since C++17) |
Example
Run this code
#include <algorithm>
#include <iostream>
#include <vector>
int main()
{
std::vector<int> alice{1, 2, 3};
std::vector<int> bob{7, 8, 9, 10};
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 10
-- SWAP
Alice: 7 8 9 10
Bobby: 1 2 3
See also
| swaps the contents (public member function) |