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std::swap(std::set)

From cppreference.com
< cpp‎ | container‎ | set

[edit template]
 
C++
 
Containers library
 
std::set
Member functions
Non-member functions
(C++20)
std::swap(std::set)
(C++20)  

(until C++20)(until C++20)(until C++20)(until C++20)(until C++20)
Deduction guides(C++17)
 
Defined in header <set>
template< class Key, class Compare, class Alloc >

void swap( std::set<Key, Compare, Alloc>& lhs,

           std::set<Key, Compare, Alloc>& rhs );
 (until C++17)
template< class Key, class Compare, class Alloc >

void swap( std::set<Key, Compare, Alloc>& lhs,
           std::set<Key, Compare, Alloc>& rhs )

    noexcept(/* see below */);
 (since C++17)
(constexpr since C++26)

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

Contents

[edit] Parameters

lhs, rhs - containers whose contents to swap

[edit] Complexity

Constant.

Exceptions

noexcept specification:  
noexcept(noexcept(lhs.swap(rhs))
 (since C++17)

[edit] Example

Run this code
#include <algorithm>
#include <iostream>
#include <set>
 
int main()
{
    std::set<int> alice{1, 2, 3};
    std::set<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

[edit] See also

 swaps the contents
(public member function) [edit]
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/container/set/swap2&oldid=135941"

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