multimap rend in C++ STL

multimap::rend() is a built-in function in C++ STL which returns a reverse iterator pointing to the theoretical element preceding to the first element of the multimap container.

Syntax

multimap_name.rend()

Parameters: The function does not take any parameter.



Return ValueThe function returns a reverse iterator pointing to the reverse end of the multimap container i.e a reverse iterator pointing to the position right before the first element of the multimap.

The iterator returned by multimap::rend() cannot be dereferenced.

The following 2 programs illustrates the function

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// CPP program to illustrate
// multimap::rend()
#include <iostream>
#include <map>
using namespace std;
  
int main()
{
    multimap<char, int> sample;
  
    // Insert pairs in the multimap
    sample.insert(make_pair('a', 10));
    sample.insert(make_pair('b', 20));
    sample.insert(make_pair('c', 30));
    sample.insert(make_pair('c', 40));
  
    // Show content
    for (auto it = sample.rbegin(); it != sample.rend(); it++)
        cout << it->first << " = " << it->second << endl;
}

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Output

c = 40
c = 30
b = 20
a = 10

Program 2

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// CPP program to illustrate
// multimap::rend()
  
#include <iostream>
#include <map>
using namespace std;
  
int main()
{
    multimap<char, int> sample;
  
    // Insert pairs in the multimap
    sample.insert(make_pair('a', 10));
    sample.insert(make_pair('b', 20));
    sample.insert(make_pair('c', 30));
    sample.insert(make_pair('c', 40));
  
    // Get the iterator pointing to
    // the preceding position of 1st element of the multimap
    auto it = sample.rend();
  
    // Get the iterator pointing to
    // the 1st element of the multimap
    it--;
    cout << it->first << " = " << it->second;
}

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Output

a = 10


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