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How to Check if a Vector is Empty in C++?
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How to Check if a Set is Empty in C++?

Last Updated : 29 Feb, 2024
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In C++, a set is an associative container that stores unique elements in a sorted order. In this article, we'll explore different approaches to check if a set is empty in C++ STL.

Check if a Set is Empty or Not in C++

To check if a std::set is empty in C++, we can use the std::set::empty() function. This function returns a boolean value indicating whether the set is empty.

C++ Program to Check if a Set is Empty

C++ 
// C++ Program to show how to check if a set is empty or not #include <iostream> #include <set> using namespace std;  int main() {     // Creating sets named 'mySet1' and 'mySet2'     set<int> mySet1;     set<int> mySet2 = { 1, 2 };      // Checking if mySet1 is empty     if (mySet1.empty()) {         cout << "Set1 is empty." << endl;     }     else {         cout << "Set1 is not empty." << endl;     }      // Checking if mySet1 is empty     if (mySet2.empty()) {         cout << "Set2 is empty." << endl;     }     else {         cout << "Set2 is not empty." << endl;     }      return 0; }  // This code is contributed by Susobhan Akhuli

Output
Set1 is empty.  Set2 is not empty.

Time Complexity: O(1)
Auxiliary Space: O(1)

The set container in C++ STL provides an size() member function that returns the size (or number of elements) of the set. We can also check is a set is empty or not using size() function in C++ because if the size is 0, then the set is empty otherwise not.


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How to Check if a Vector is Empty in C++?
author
susobhanakhuli19
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Article Tags :
  • C++ Programs
  • C++
  • STL
  • cpp-set
  • CPP Examples
Practice Tags :
  • CPP
  • STL

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