unordered_set find() function in C++ STL

The unordered_set::find() function is a built-in function in C++ STL which is used to search for an element in the container. It returns an iterator to the element, if found else, it returns an iterator pointing to unordered_set::end().

Syntax :

unordered_set_name.find(key)

Parameter: This function accepts a mandatory parameter key which specifies the element to be searched for.

Return Value: It returns an iterator to the element if found, else returns an iterator pointing to the end of unordered_set.

Below programs illustrate the unordered_set::find() function:



Program 1:

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// C++ program to illustrate the
// unordered_set::find() function
  
#include <iostream>
#include <string>
#include <unordered_set>
  
using namespace std;
  
int main()
{
  
    unordered_set<string> sampleSet = { "geeks1", "for", "geeks2" };
  
    // use of find() function
    if (sampleSet.find("geeks1") != sampleSet.end()) {
        cout << "element found." << endl;
    }
    else {
        cout << "element not found" << endl;
    }
  
    return 0;
}

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Output:


element found.





Program 2:











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// CPP program to illustrate the 


// unordered_set::find() function 


  


#include <iostream> 


#include <string> 


#include <unordered_set> 


  


using namespace std; 


  


int main() 


{ 


  


    unordered_set<string> sampleSet = { "geeks1", "for", "geeks2" }; 


  


    // use of find() function 


    if (sampleSet.find("geeksforgeeks") != sampleSet.end()) { 


        cout << "found" << endl; 


    } 


    else { 


        cout << "Not found" << endl; 


    } 


  


    return 0; 


} 



















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Output:


Not found






          
          
          
          

            

    

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