unordered_multimap max_size() function in C++ STL

The unordered_multimap::max_size() is a built-in function in C++ STL which returns the maximum number of elements that the unordered_multimap container can hold.

Syntax:

unordered_multimap_name.max_size()

Parameters: The function does not accepts any parameters.

Return Value: It returns an integral values which denotes the maximum size of elements that the container can hold.

Below programs illustrates the above function:

Program 1:

// C++ program to illustrate the 
// unordered_multimap::max_size() 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // declaration 
    unordered_multimap<int, int> sample1; 
  
    // inserts key and element 
    // in sample1 
    sample1.insert({ 10, 100 }); 
    sample1.insert({ 50, 500 }); 
  
    cout << "The max number of elements that sample1 can hold: "
         << sample1.size(); 
  
    cout << "\nKey and Elements of Sample1 are:"; 
    for (auto it = sample1.begin(); it != sample1.end(); it++) { 
        cout << "{" << it->first << ", " << it->second << "} "; 
    } 
  
    return 0; 
} 

Output:

The max number of elements that sample1 can hold: 2
Key and Elements of Sample1 are:{50, 500} {10, 100}

Program 2:

// C++ program to illustrate the 
// unordered_multimap::max_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' }); 
  
    cout << "The max number of elements that sample1 can hold: "
         << sample1.size(); 
  
    cout << "\nKey and Elements of Sample1 are:"; 
    for (auto it = sample1.begin(); it != sample1.end(); it++) { 
        cout << "{" << it->first << ", " << it->second << "} "; 
    } 
  
    return 0; 
} 

Output:

The max number of elements that sample1 can hold: 2
Key and Elements of Sample1 are:{g, G} {a, A}

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