std::swap(std::forward_list)

Since C++17

Header: <forward_list>

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

# Declarations

template< class T, class Alloc >
void swap( std::forward_list<T, Alloc>& lhs,
std::forward_list<T, Alloc>& rhs );

(since C++11) (until C++17)

template< class T, class Alloc >
void swap( std::forward_list<T, Alloc>& lhs,
std::forward_list<T, Alloc>& rhs )
noexcept(/* see below */);

(since C++17)

# Parameters

lhs, rhs: containers whose contents to swap

# Return value

(none)

# Example

#include <algorithm>
#include <iostream>
#include <forward_list>
 
int main()
{
    std::forward_list<int> alice{1, 2, 3};
    std::forward_list<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';
}

# See also

swap