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std::swap(std::stack)

From cppreference.com
< cpp‎ | container‎ | stack
 
 
 
 
Defined in header <stack>
template< class T, class Container >

void swap( std::stack <T, Container>& lhs,

           std::stack <T, Container>& rhs );
(since C++11)
(until C++17)
template< class T, class Container >

void swap( std::stack <T, Container>& lhs,
           std::stack <T, Container>& rhs )

    noexcept(/* see below */);
(since C++17)
(constexpr since C++26)
Specializes the std::swap algorithm for std::stack . Swaps the contents of lhs and rhs. Calls lhs.swap(rhs).

This overload participates in overload resolution only if std::is_swappable_v <Container> is true.

(since C++17)

[edit] Parameters

lhs, rhs - containers whose contents to swap

[edit] Complexity

Same as swapping the underlying containers.

Exceptions

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

Notes

Although the overloads of std::swap for container adaptors are introduced in C++11, container adaptors can already be swapped by std::swap in C++98. Such calls to std::swap usually have linear time complexity, but better complexity may be provided.

[edit] Example

Run this code
#include <algorithm>
#include <iostream>
#include <stack>
 
int main()
{
 std::stack <int> alice;
 std::stack <int> bob;
 
 auto print = [](const auto& title, const auto& cont)
 {
 std::cout << title << " size=" << cont.size();
 std::cout << " top=" << cont.top() << '\n';
 };
 
 for (int i = 1; i < 4; ++i)
 alice.push(i);
 for (int i = 7; i < 11; ++i)
 bob.push(i);
 
 // Print state before swap
 print("Alice:", alice);
 print("Bobby:", bob);
 
 std::cout << "-- SWAP\n";
 std::swap (alice, bob);
 
 // Print state after swap
 print("Alice:", alice);
 print("Bobby:", bob);
}

Output:

Alice: size=3 top=3
Bobby: size=4 top=10
-- SWAP
Alice: size=4 top=10
Bobby: size=3 top=3

[edit] See also

(C++11)
swaps the contents
(public member function) [edit]
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