Difference between revisions of "cpp/container/multimap/swap2"
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Latest revision as of 00:21, 4 November 2023
| Defined in header <map>
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template< class Key, class T, class Compare, class Alloc > void swap( std::multimap<Key, T, Compare, Alloc>& lhs, |
(until C++17) | |
| template< class Key, class T, class Compare, class Alloc > void swap( std::multimap<Key, T, Compare, Alloc>& lhs, |
(since C++17) | |
Specializes the std::swap algorithm for std::multimap. Swaps the contents of lhs and rhs. Calls lhs.swap(rhs).
Contents |
[edit] Parameters
| lhs, rhs | - | containers whose contents to swap |
[edit] Return value
(none)
[edit] Complexity
Constant.
Exceptions
|
noexcept specification:
noexcept(noexcept(lhs.swap(rhs))) |
(since C++17) |
[edit] Example
Run this code
#include <algorithm> #include <iostream> #include <map> int main() { std::multimap<int, char> alice{{1, 'a'}, {2, 'b'}, {3, 'c'}}; std::multimap<int, char> bob{{7, 'Z'}, {8, 'Y'}, {9, 'X'}, {10, 'W'}}; auto print = [](std::pair<const int, char>& n) { std::cout << ' ' << n.first << ':' << n.second; }; // 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:a 2:b 3:c Bobby: 7:Z 8:Y 9:X 10:W -- SWAP Alice: 7:Z 8:Y 9:X 10:W Bobby: 1:a 2:b 3:c
[edit] See also
| swaps the contents (public member function) |
