Unordered_multimap ::swap() es una función integrada en C++ STL que intercambia el contenido de dos contenedores unordered_multimap. Los tamaños pueden diferir de ambos contenedores.
Sintaxis:
unordered_multimap_name1.swap(unordered_multimap_name2)
Parámetros: La función acepta un solo parámetro obligatorio unordered_multimap_name2 que especifica el unordered_multimap con el que se debe realizar el intercambio de unordered_multimap_name1 .
Valor devuelto: No devuelve nada.
Los siguientes programas ilustran la función anterior:
Programa 1:
// C++ program to illustrate the
// unordered_multimap::swap()
#include <bits/stdc++.h>
using namespace std;
int main()
{
// declaration
unordered_multimap<int, int> sample1, sample2;
// inserts key and element
// in sample1
sample1.insert({ 10, 100 });
sample1.insert({ 50, 500 });
// inserts key and element
// in sample1
sample2.insert({ 20, 200 });
sample2.insert({ 30, 300 });
sample2.insert({ 30, 150 });
cout << "Key and Elements of Sample1 before swap are:";
for (auto it = sample1.begin(); it != sample1.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
cout << "\nKey and Elements of Sample2 before swap are:";
for (auto it = sample2.begin(); it != sample2.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
// performs swap of two
// unordered_multimaps
sample1.swap(sample2);
cout << "\n\nKey and Elements of Sample1 after swap are:";
for (auto it = sample1.begin(); it != sample1.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
cout << "\nKey and Elements of Sample2 after swap are:";
for (auto it = sample2.begin(); it != sample2.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
return 0;
}
Producción:
Key and Elements of Sample1 before swap are:{50, 500} {10, 100}
Key and Elements of Sample2 before swap are:{20, 200} {30, 150} {30, 300}
Key and Elements of Sample1 after swap are:{20, 200} {30, 150} {30, 300}
Key and Elements of Sample2 after swap are:{50, 500} {10, 100}
Programa 2:
// C++ program to illustrate the
// unordered_multimap::swap()
#include <bits/stdc++.h>
using namespace std;
int main()
{
// declaration
unordered_multimap<char, char> sample1, sample2;
// inserts key and element
// in sample1
sample1.insert({ 'a', 'A' });
sample1.insert({ 'g', 'G' });
// inserts key and element
// in sample1
sample2.insert({ 'b', 'B' });
sample2.insert({ 'c', 'C' });
sample2.insert({ 'd', 'D' });
cout << "Key and Elements of Sample1 before swap are:";
for (auto it = sample1.begin(); it != sample1.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
cout << "\nKey and Elements of Sample2 before swap are:";
for (auto it = sample2.begin(); it != sample2.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
// performs swap of two
// unordered_multimaps
sample1.swap(sample2);
cout << "\n\nKey and Elements of Sample1 after swap are:";
for (auto it = sample1.begin(); it != sample1.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
cout << "\nKey and Elements of Sample2 after swap are:";
for (auto it = sample2.begin(); it != sample2.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
return 0;
}
Producción:
Key and Elements of Sample1 before swap are:{g, G} {a, A}
Key and Elements of Sample2 before swap are:{d, D} {b, B} {c, C}
Key and Elements of Sample1 after swap are:{d, D} {b, B} {c, C}
Key and Elements of Sample2 after swap are:{g, G} {a, A}