C++ set end() Function

by Online Tutorials Library July 22, 2022

C++ set end()

C++ set end() function is used to return an iterator which is next to the last entry in the set.

Note:- This is a placeholder. No element exists in this location and attempting to access is undefined behavior.

Syntax

        iterator end();                            //until C++ 11  const_iterator end() const;                //until C++ 11        iterator end() noexcept;              //since C++ 11  const_iterator end() const noexcept;  //since C++ 11  

Parameter

None

Return value

It returns an iterator which is pointing next to the last element of the set.

Complexity

Constant.

Iterator validity

No changes.

Data Races

Concurrently accessing the elements of a set is safe.

The container is accessed neither the non-const nor the const versions modify the container.

Exception Safety

This member function never throws exception.

Example 1

Let’s see the simple example for end() function:

  #include <iostream>  #include <set>    using namespace std;    int main ()  {    set<string> myset = {“Java”, “C++”, “SQL”};      // show content:    for (set<string>::iterator it=myset.begin(); it!=myset.end(); ++it)      cout << *it<< ‘n’;      return 0;  }  

Output:

C++  Java  SQL

In the above example, end() function is used to return an iterator pointing next to the last element in the myset set.

Example 2

Let’s see a simple example to iterate over the set using for-each loop:

  #include <iostream>  #include <set>    using namespace std;    int main()  {    set<int> c;    c.insert(5);    c.insert(2);    c.insert(4);    c.insert(1);    c.insert(0);    c.insert(0);    c.insert(9);      set<int>::iterator i = c.begin();    while (i != c.end())      cout << *i++ << ” “;    cout << endl;  }  

Output:

0 1 2 4 5 9

Example 3

Let’s see a simple example to iterate over the set using while loop:

  #include <iostream>  #include <set>  #include <string>  int main()  {      using namespace std;           set<string> myset = { “Nikita”,”Deep”,”Priya”,”Suman”,”Aman” };     cout<<“Elements of myset are: “<<endl;      set<string>::const_iterator it; // declare an iterator        it = myset.begin(); // assign it to the start of the set        while (it != myset.end()) // while it hasn’t reach the end      {  cout << *it << “n”;     // print the value of the element it points to    ++it; // and iterate to the next element      }         cout << endl;  }  

Output:

Elements of myset are:   Aman  Deep  Nikita  Priya  Suman

In the above example, end() function is used to return an iterator pointing next to the last element in the myset set.

Example 4

Let’s see a simple example:

  #include <iostream>  #include <string>  #include <set>      using namespace std;    int main ()  {      int val;      set<int> c = {10,20,30,40,50};         cout<<“Enter value to find: “;      cin>>val;        auto result = c.find(val);              //find until end of the set elements      if (result != c.end()) {            cout << “Element found: “<< *result;           cout << endl;        } else {            cout << “Element not found.” << endl;        }            return 0;  }  

Output:

Enter value to find: 60  Element not found.      Enter value to find: 30  Element found: 30

In the above example, end() function is used to return an iterator pointing next to the last element in the myset set.

Next TopicSet cend() Function

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C++ set end() Function

C++ set end()

Note:- This is a placeholder. No element exists in this location and attempting to access is undefined behavior.

Syntax

Parameter

Return value

Complexity

Iterator validity

Data Races

Exception Safety

Example 1

Example 2

Example 3

Example 4

What is boot

C++ Math scalbln() Function

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