El multimap::swap() es una función integrada en C++ STL que intercambia dos contenedores multimapa. El contenido de multimap1 está en multimap2 y el contenido de multimap2 está en multimap1 después de llamar a la función swap().
Sintaxis:
multimap1_name.swap(multimap2_name)
Parámetros: esta función acepta un parámetro que debe intercambiarse con multimap1_name,
Valor devuelto: la función no devuelve nada.
// C++ function for illustration
// multimap::swap() function
#include <bits/stdc++.h>
using namespace std;
int main()
{
// initialize container
multimap<int, int> mp1, mp2;
// insert elements in random order
mp1.insert({ 2, 30 });
mp1.insert({ 1, 40 });
mp2.insert({ 10, 60 });
mp2.insert({ 9, 20 });
cout << "\nThe multimap1 before applying swap() is : \n";
cout << "KEY\tELEMENT\n";
for (auto itr = mp1.begin(); itr != mp1.end(); ++itr) {
cout << itr->first
<< '\t' << itr->second << '\n';
}
cout << "\nThe multimap2 before applying swap() is : \n";
cout << "KEY\tELEMENT\n";
for (auto itr = mp2.begin(); itr != mp2.end(); ++itr) {
cout << itr->first
<< '\t' << itr->second << '\n';
}
// performs swap operation of two multimap
mp1.swap(mp2);
cout << "\nThe multimap1 after applying swap() is : \n";
cout << "KEY\tELEMENT\n";
for (auto itr = mp1.begin(); itr != mp1.end(); ++itr) {
cout << itr->first
<< '\t' << itr->second << '\n';
}
cout << "\nThe multimap2 after applying swap() is : \n";
cout << "KEY\tELEMENT\n";
for (auto itr = mp2.begin(); itr != mp2.end(); ++itr) {
cout << itr->first
<< '\t' << itr->second << '\n';
}
return 0;
}