unordered_multimap max_load_factor() function in C++ STL

The unordered_multimap::max_load_factor() is a built-in function in C++ STL which returns the maximum load factor of the unordered_multimap container. This function also provides with an option of setting the maximum load factor.

  1. Syntax (To return the maximum load factor) :
    unordered_multimap_name.max_load_factor()

    Parameters: The function does not accept any parameters.

    Return Value: It returns an integral values which denotes the maximum load factor of the container.

    Below programs illustrates the above function:

    Program 1:

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    // 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 });
      
        // prints the max load factor
        cout << "The max load factor  of sample1: "
             << sample1.max_load_factor();
      
        cout << "\nKey and Elements of Sample1 are:";
        for (auto it = sample1.begin(); it != sample1.end(); it++) {
            cout << "{" << it->first << ", " << it->second << "} ";
        }
      
        return 0;
    }

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    Output:

    The max load factor  of sample1: 1
    Key and Elements of Sample1 are:{50, 500} {10, 100}
    
  2. Syntax (To set the maximum load factor):
    unordered_multimap_name.max_load_factor(N)

    Parameters: The function accepts a single mandatory parameter N which specifies the load factor to be set. This N will be the maximum load factor of the container.

    Return Value: The function does not returns anything.

    Below program illustrates the above function:

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    // 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 load factor of elements of sample1: "
             << sample1.max_load_factor();
      
        // sets the load factor
        sample1.max_load_factor(100);
      
        cout << "\nThe max load factor of sample1 after setting it: "
             << sample1.max_load_factor();
      
        cout << "\nKey and Elements of Sample1 are:";
        for (auto it = sample1.begin(); it != sample1.end(); it++) {
            cout << "{" << it->first << ", " << it->second << "} ";
        }
      
        return 0;
    }

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    Output:

    The max load factor of elements of sample1: 1
    The max load factor of sample1 after setting it: 100
    Key and Elements of Sample1 are:{50, 500} {10, 100}
    


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