Unordered_multimap ::size() es una función integrada en C++ STL que devuelve el tamaño de unordered_multimap. Indica el número de elementos en ese contenedor.
Sintaxis:
unordered_multimap_name.size()
Parámetros: La función no acepta ningún parámetro.
Valor devuelto: Devuelve un valor integral que denota el tamaño de los contenedores.
Los siguientes programas ilustran la función anterior:
Programa 1:
// C++ program to illustrate the
// unordered_multimap::size()
#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 << "The size of Sample1 is: " << sample1.size();
cout << "\nKey and Elements of Sample1 are:";
for (auto it = sample1.begin(); it != sample1.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
cout << "\n\nThe size of Sample2 is: " << sample2.size();
cout << "\nKey and Elements of Sample2 are:";
for (auto it = sample2.begin(); it != sample2.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
return 0;
}
Producción:
The size of Sample1 is: 2
Key and Elements of Sample1 are:{50, 500} {10, 100}
The size of Sample2 is: 3
Key and Elements of Sample2 are:{20, 200} {30, 150} {30, 300}
Programa 2:
// C++ program to illustrate the
// unordered_multimap::size()
#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 << "The size of Sample1 is: " << sample1.size();
cout << "\nKey and Elements of Sample1 are:";
for (auto it = sample1.begin(); it != sample1.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
cout << "\n\nThe size of Sample2 is: " << sample2.size();
cout << "\nKey and Elements of Sample2 are:";
for (auto it = sample2.begin(); it != sample2.end(); it++) {
cout << "{" << it->first << ", " << it->second << "} ";
}
return 0;
}
Producción:
The size of Sample1 is: 2
Key and Elements of Sample1 are:{g, G} {a, A}
The size of Sample2 is: 3
Key and Elements of Sample2 are:{d, D} {b, B} {c, C}